Search

Your search keyword '"Flaccomio, E."' showing total 532 results
Start Over Author "Flaccomio, E."
532 results on '"Flaccomio, E."'

151. TheGaia-ESO Survey: a kinematical and dynamical study of four young open clusters

Author

Bravi, L., primary, Zari, E., additional, Sacco, G. G., additional, Randich, S., additional, Jeffries, R. D., additional, Jackson, R. J., additional, Franciosini, E., additional, Moraux, E., additional, López-Santiago, J., additional, Pancino, E., additional, Spina, L., additional, Wright, N. J., additional, Jiménez-Esteban, F. M., additional, Klutsch, A., additional, Roccatagliata, V., additional, Gilmore, G., additional, Bragaglia, A., additional, Flaccomio, E., additional, Francois, P., additional, Koposov, S. E., additional, Bayo, A., additional, Carraro, G., additional, Costado, M. T., additional, Damiani, F., additional, Frasca, A., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Magrini, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2018
Full Text
View/download PDF

152. The Gaia-ESO Survey: evidence of atomic diffusion in M67?

Author

Bertelli Motta, C, primary, Pasquali, A, additional, Richer, J, additional, Michaud, G, additional, Salaris, M, additional, Bragaglia, A, additional, Magrini, L, additional, Randich, S, additional, Grebel, E K, additional, Adibekyan, V, additional, Blanco-Cuaresma, S, additional, Drazdauskas, A, additional, Fu, X, additional, Martell, S, additional, Tautvaišienė, G, additional, Gilmore, G, additional, Alfaro, E J, additional, Bensby, T, additional, Flaccomio, E, additional, Koposov, S E, additional, Korn, A J, additional, Lanzafame, A C, additional, Smiljanic, R, additional, Bayo, A, additional, Carraro, G, additional, Casey, A R, additional, Costado, M T, additional, Damiani, F, additional, Franciosini, E, additional, Heiter, U, additional, Hourihane, A, additional, Jofré, P, additional, Lardo, C, additional, Lewis, J, additional, Monaco, L, additional, Morbidelli, L, additional, Sacco, G G, additional, Sousa, S G, additional, Worley, C C, additional, and Zaggia, S, additional

Published
2018
Full Text
View/download PDF

153. The Gaia-ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc

Author

Fu, X., primary, Romano, D., additional, Bragaglia, A., additional, Mucciarelli, A., additional, Lind, K., additional, Delgado Mena, E., additional, Sousa, S. G., additional, Randich, S., additional, Bressan, A., additional, Sbordone, L., additional, Martell, S., additional, Korn, A. J., additional, Abia, C., additional, Smiljanic, R., additional, Jofré, P., additional, Pancino, E., additional, Tautvaišienė, G., additional, Tang, B., additional, Magrini, L., additional, Lanzafame, A. C., additional, Carraro, G., additional, Bensby, T., additional, Damiani, F., additional, Alfaro, E. J., additional, Flaccomio, E., additional, Morbidelli, L., additional, Zaggia, S., additional, Lardo, C., additional, Monaco, L., additional, Frasca, A., additional, Donati, P., additional, Drazdauskas, A., additional, Chorniy, Y., additional, Bayo, A., additional, and Kordopatis, G., additional

Published
2018
Full Text
View/download PDF

154. The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264

Author

Venuti, L., primary, Prisinzano, L., additional, Sacco, G. G., additional, Flaccomio, E., additional, Bonito, R., additional, Damiani, F., additional, Micela, G., additional, Guarcello, M. G., additional, Randich, S., additional, Stauffer, J. R., additional, Cody, A. M., additional, Jeffries, R. D., additional, Alencar, S. H. P., additional, Alfaro, E. J., additional, Lanzafame, A. C., additional, Pancino, E., additional, Bayo, A., additional, Carraro, G., additional, Costado, M. T., additional, Frasca, A., additional, Jofré, P., additional, Morbidelli, L., additional, Sousa, S. G., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

155. TheGaia-ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates

Author

Merle, T., primary, Van Eck, S., additional, Jorissen, A., additional, Van der Swaelmen, M., additional, Masseron, T., additional, Zwitter, T., additional, Hatzidimitriou, D., additional, Klutsch, A., additional, Pourbaix, D., additional, Blomme, R., additional, Worley, C. C., additional, Sacco, G., additional, Lewis, J., additional, Abia, C., additional, Traven, G., additional, Sordo, R., additional, Bragaglia, A., additional, Smiljanic, R., additional, Pancino, E., additional, Damiani, F., additional, Hourihane, A., additional, Gilmore, G., additional, Randich, S., additional, Koposov, S., additional, Casey, A., additional, Morbidelli, L., additional, Franciosini, E., additional, Magrini, L., additional, Jofre, P., additional, Costado, M. T., additional, Jeffries, R. D., additional, Bergemann, M., additional, Lanzafame, A. C., additional, Bayo, A., additional, Carraro, G., additional, Flaccomio, E., additional, Monaco, L., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

157. The Gaia-ESO Survey: Reevaluation of the parameters of the open cluster Trumpler 20 using photometry and spectroscopy

Author

Maiorca, E., Lardo, C., Jofre, P., Hourihane, A., Worley, C., Sacco, G., Prisinzano, L., Morbidelli, L., Lewis, J., De Laverny, P., Franciosini, E., Recio-Blanco, A., Pancino, E., Korn, A., Koposov, S., Flaccomio, E., Bensby, T., Randich, S., Gilmore, G., Zaggia, S., Roman, I., Muñoz, C., Mowlavi, N., Klutsch, A., Geisler, D., Costado, M., Blanco-Cuaresma, S., Tautvaišienė, G., Sordo, R., Tosi, M., Vallenari, A., Smiljanic, R., Magrini, L., Friel, E., Bragaglia, A., Cantat-Gaudin, T., Donati, P., Jofré, P., M2A 2014, Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), Department of Astronomy and Space Physics [Uppsala], Uppsala University, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1, Donati P., Cantat Gaudin T., Bragaglia A., Friel E., Magrini L., Smiljanic R., Vallenari A., Tosi M., Sordo R., Tautvaisiene G., Blanco-Cuaresma S., Costado M.T., Geisler D., Klutsch A., Mowlavi N., Munoz C., San Roman I., Zaggia S., Gilmore G., Randich S., Bensby T., Flaccomio E., Koposov S.E., Korn A.J., Pancino E., Recio-Blanco A., Franciosini E., De Laverny P., Lewis J., Morbidelli L., Prisinzano L., Sacco G., Worley C.C., Hourihane A., Jofre P., Lardo C., and Maiorca E.

Subjects
Physics, Line-of-sight, Spiral galaxy, astro-ph.SR, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Metallicity, FOS: Physical sciences, Astronomy and Astrophysics, Open clusters and associations: general, Astrophysics, [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Photometry (optics), Stars, Distance modulus, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Hertzsprung-Russell and C-M diagram, 10. No inequality, Red clump, Solar and Stellar Astrophysics (astro-ph.SR), Open cluster
Abstract

Trumpler 20 is an old open cluster (OC) located toward the Galactic centre, at about 3 kpc from the Sun and $\sim$7 kpc from the Galactic centre. Its position makes this cluster particularly interesting in the framework of the chemical properties of the Galactic disc because very few old OCs reside in the inner part of the disc. For this reason it has been selected as a cluster target of the Gaia-ESO Survey, and spectra of many stars in the main sequence and red clump phases are now available. Moreover, although it has been studied by several authors in the past, no consensus on the evolutionary status of Tr 20 has been reached. The heavy contamination of field stars (the line of sight of Tr 20 crosses the Carina spiral arm) complicates a correct interpretation. Another interesting aspect of the cluster is that it shows a broadened main-sequence turn-off and a prominent and extended red-clump, characteristics that are not easily explained by classical evolutionary models. Exploiting both spectroscopic information from the Gaia-ESO Survey (and the ESO archive) and literature photometry, we obtain a detailed and accurate analysis of the properties of the cluster. We make use of the first accurate metallicity measurement ever obtained from several spectra of red clump stars, and of cluster membership determination using radial velocities. According to the evolutionary models adopted, we find that Tr 20 has an age in the range 1.35-1.66 Gyr, an average reddening $E(B-V)$ in the range 0.31-0.35 mag, and a distance modulus $(m-M)_0$ between 12.64 and 12.72 mag. The spectroscopic metallicity is [Fe/H]=+0.17 dex. We discuss the structural properties of the object and constrain possible hypotheses for its broadened upper main sequence by estimating the effect of differential reddening and its extended red clump., 14 pages, 14 figures - Accepted on 9 Dec. 2013 Reference list updated and minor corrections added to the text

Published
2014

158. The Gaia-ESO Survey: A simple explanation for the Li-rich giant problem

Author

Casey, Andrew R., Ruchti, G., Masseron, T., Randich, S., Gilmore, G., Lind, K., Grant Kennedy, Smiljanic, R., Jofre, P., Hourihane, A., Bragaglia, A., Donati, P., Koposov, S. E., Worley, C. C., Lanzafame, A., Franciosini, E., Lewis, J. R., Magrini, L., Morbidelli, L., Sacco, G. G., Bensby, T., Carraro, G., Damiani, F., Feltzing, S., Jeffries, R. D., Korn, A. J., Lardo, C., Laverny, P., Delgado Mena, E., Costado, M. T., Flaccomio, E., Frasca, A., Monaco, L., Pancino, E., Prisinzano, L., Recio-Blanco, A., Sbordone, L., Sousa, S. G., Tautvaisiene, G., Vallenari, A., Zaggia, S., Zwitter, T., Silva Aguirre, V., Chorniy, Y., Martell, S. L., Miglo, A., Chiappini, C., Montalban, J., Morel, T., and Valentini, M.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Although multiple scenarios have been proposed to preserve or produce Li, no model can explain the ensemble properties of Li-rich giants. We report on the serendipitous discovery of 20 Li-rich giants observed through the Gaia-ESO Survey. Our sample is one of the largest in the literature, and includes nine towards the CoRoT fields. We explore all mechanisms proposed to explain Li-rich giants. While the planet accretion scenario was presented to reconcile observations of Li-rich giants across the RGB/AGB, this is inconsistent with recent studies of close-in giant planets. We highlight recent observations of the difference in hot Jupiter occurrence rates around dwarf and sub-giant stars as evidence for their tidal destruction when the convective envelope expands. Therefore any close-in giant planet is likely to be engulfed well before the host evolves up the RGB/AGB. When this occurs, simulations indicate a giant planet will provide a small reservoir of unburnt Li to replenish the stellar photospheric abundance, and subsequently induce deep mixing to produce additional Li. We argue these two independent lines of evidence actually predict the existence of Li-rich giants, and suggests they should be preferentially found before the luminosity bump at near-solar metallicities, consistent with observations. This scenario explains (indeed, predicts) the majority properties of Li-rich giants, leaving a minority population of evolved metal-poor Li-rich giants which are explainable by internal mixing processes associated with late evolutionary stages, or mass transfer from more evolved AGB stars.

Published
2016

159. TheGaia-ESO Survey: dynamics of ionized and neutral gas in the Lagoon nebula (M 8)

Author

Damiani, F., primary, Bonito, R., additional, Prisinzano, L., additional, Zwitter, T., additional, Bayo, A., additional, Kalari, V., additional, Jiménez-Esteban, F. M., additional, Costado, M. T., additional, Jofré, P., additional, Randich, S., additional, Flaccomio, E., additional, Lanzafame, A. C., additional, Lardo, C., additional, Morbidelli, L., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

160. TheGaia-ESO Survey: Galactic evolution of sulphur and zinc

Author

Duffau, S., primary, Caffau, E., additional, Sbordone, L., additional, Bonifacio, P., additional, Andrievsky, S., additional, Korotin, S., additional, Babusiaux, C., additional, Salvadori, S., additional, Monaco, L., additional, François, P., additional, Skúladóttir, Á., additional, Bragaglia, A., additional, Donati, P., additional, Spina, L., additional, Gallagher, A. J., additional, Ludwig, H.-G., additional, Christlieb, N., additional, Hansen, C. J., additional, Mott, A., additional, Steffen, M., additional, Zaggia, S., additional, Blanco-Cuaresma, S., additional, Calura, F., additional, Friel, E., additional, Jiménez-Esteban, F. M., additional, Koch, A., additional, Magrini, L., additional, Pancino, E., additional, Tang, B., additional, Tautvaišienė, G., additional, Vallenari, A., additional, Hawkins, K., additional, Gilmore, G., additional, Randich, S., additional, Feltzing, S., additional, Bensby, T., additional, Flaccomio, E., additional, Smiljanic, R., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Costado, M. T., additional, Damiani, F., additional, Franciosini, E., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Morbidelli, L., additional, Sousa, S. G., additional, and Worley, C. C., additional

Published
2017
Full Text
View/download PDF

161. Gaia-ESO Survey: Global properties of clusters Trumpler 14 and 16 in the Carina nebula

Author

Damiani, F., primary, Klutsch, A., additional, Jeffries, R. D., additional, Randich, S., additional, Prisinzano, L., additional, Maíz Apellániz, J., additional, Micela, G., additional, Kalari, V., additional, Frasca, A., additional, Zwitter, T., additional, Bonito, R., additional, Gilmore, G., additional, Flaccomio, E., additional, Francois, P., additional, Koposov, S., additional, Lanzafame, A. C., additional, Sacco, G. G., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Alfaro, E. J., additional, Costado, M. T., additional, Donati, P., additional, Franciosini, E., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Magrini, L., additional, Monaco, L., additional, Morbidelli, L., additional, Worley, C. C., additional, Vink, J. S., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

162. TheGaia-ESO Survey: radial distribution of abundances in the Galactic disc from open clusters and young-field stars

Author

Magrini, L., primary, Randich, S., additional, Kordopatis, G., additional, Prantzos, N., additional, Romano, D., additional, Chieffi, A., additional, Limongi, M., additional, François, P., additional, Pancino, E., additional, Friel, E., additional, Bragaglia, A., additional, Tautvaišienė, G., additional, Spina, L., additional, Overbeek, J., additional, Cantat-Gaudin, T., additional, Donati, P., additional, Vallenari, A., additional, Sordo, R., additional, Jiménez-Esteban, F. M., additional, Tang, B., additional, Drazdauskas, A., additional, Sousa, S., additional, Duffau, S., additional, Jofré, P., additional, Gilmore, G., additional, Feltzing, S., additional, Alfaro, E., additional, Bensby, T., additional, Flaccomio, E., additional, Koposov, S., additional, Lanzafame, A., additional, Smiljanic, R., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Costado, M. T., additional, Damiani, F., additional, Franciosini, E., additional, Hourihane, A., additional, Lardo, C., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Sacco, G., additional, Sbordone, L., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

164. The Gaia–ESO Survey: dynamical models of flattened, rotating globular clusters

Author

Jeffreson, S. M. R., primary, Sanders, J. L., additional, Evans, N. W., additional, Williams, A. A., additional, Gilmore, G. F., additional, Bayo, A., additional, Bragaglia, A., additional, Casey, A. R., additional, Flaccomio, E., additional, Franciosini, E., additional, Hourihane, A., additional, Jackson, R. J., additional, Jeffries, R. D., additional, Jofré, P., additional, Koposov, S., additional, Lardo, C., additional, Lewis, J., additional, Magrini, L., additional, Morbidelli, L., additional, Pancino, E., additional, Randich, S., additional, Sacco, G. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

165. TheGaia-ESO Survey

Author

Pancino, E., primary, Romano, D., additional, Tang, B., additional, Tautvaišienė, G., additional, Casey, A. R., additional, Gruyters, P., additional, Geisler, D., additional, San Roman, I., additional, Randich, S., additional, Alfaro, E. J., additional, Bragaglia, A., additional, Flaccomio, E., additional, Korn, A. J., additional, Recio-Blanco, A., additional, Smiljanic, R., additional, Carraro, G., additional, Bayo, A., additional, Costado, M. T., additional, Damiani, F., additional, Jofré, P., additional, Lardo, C., additional, de Laverny, P., additional, Monaco, L., additional, Morbidelli, L., additional, Sbordone, L., additional, Sousa, S. G., additional, and Villanova, S., additional

Published
2017
Full Text
View/download PDF

166. TheGaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters

Author

Spina, L., primary, Randich, S., additional, Magrini, L., additional, Jeffries, R. D., additional, Friel, E. D., additional, Sacco, G. G., additional, Pancino, E., additional, Bonito, R., additional, Bravi, L., additional, Franciosini, E., additional, Klutsch, A., additional, Montes, D., additional, Gilmore, G., additional, Vallenari, A., additional, Bensby, T., additional, Bragaglia, A., additional, Flaccomio, E., additional, Koposov, S. E., additional, Korn, A. J., additional, Lanzafame, A. C., additional, Smiljanic, R., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Costado, M. T., additional, Damiani, F., additional, Donati, P., additional, Frasca, A., additional, Hourihane, A., additional, Jofré, P., additional, Lewis, J., additional, Lind, K., additional, Monaco, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

167. TheGaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I

Author

Sacco, G. G., primary, Spina, L., additional, Randich, S., additional, Palla, F., additional, Parker, R. J., additional, Jeffries, R. D., additional, Jackson, R., additional, Meyer, M. R., additional, Mapelli, M., additional, Lanzafame, A. C., additional, Bonito, R., additional, Damiani, F., additional, Franciosini, E., additional, Frasca, A., additional, Klutsch, A., additional, Prisinzano, L., additional, Tognelli, E., additional, Degl’Innocenti, S., additional, Prada Moroni, P. G., additional, Alfaro, E. J., additional, Micela, G., additional, Prusti, T., additional, Barrado, D., additional, Biazzo, K., additional, Bouy, H., additional, Bravi, L., additional, Lopez-Santiago, J., additional, Wright, N. J., additional, Bayo, A., additional, Gilmore, G., additional, Bragaglia, A., additional, Flaccomio, E., additional, Koposov, S. E., additional, Pancino, E., additional, Casey, A. R., additional, Costado, M. T., additional, Donati, P., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Magrini, L., additional, Monaco, L., additional, Morbidelli, L., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

168. The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations

Author

Rojas-Arriagada, A., primary, Recio-Blanco, A., additional, de Laverny, P., additional, Mikolaitis, Š., additional, Matteucci, F., additional, Spitoni, E., additional, Schultheis, M., additional, Hayden, M., additional, Hill, V., additional, Zoccali, M., additional, Minniti, D., additional, Gonzalez, O. A., additional, Gilmore, G., additional, Randich, S., additional, Feltzing, S., additional, Alfaro, E. J., additional, Babusiaux, C., additional, Bensby, T., additional, Bragaglia, A., additional, Flaccomio, E., additional, Koposov, S. E., additional, Pancino, E., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Costado, M. T., additional, Damiani, F., additional, Donati, P., additional, Franciosini, E., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Lind, K., additional, Magrini, L., additional, Morbidelli, L., additional, Sacco, G. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

169. The Gaia-ESO survey: the inner disk intermediate-age open cluster NGC 6802

Author

Tang, B., primary, Geisler, D., additional, Friel, E., additional, Villanova, S., additional, Smiljanic, R., additional, Casey, A. R., additional, Randich, S., additional, Magrini, L., additional, San Roman, I., additional, Muñoz, C., additional, Cohen, R. E., additional, Mauro, F., additional, Bragaglia, A., additional, Donati, P., additional, Tautvaišien*error*ė, G., additional, Drazdauskas, A., additional, Ženovienė, R., additional, Snaith, O., additional, Sousa, S., additional, Adibekyan, V., additional, Costado, M. T., additional, Blanco-Cuaresma, S., additional, Jiménez-Esteban, F., additional, Carraro, G., additional, Zwitter, T., additional, François, P., additional, Jofrè, P., additional, Sordo, R., additional, Gilmore, G., additional, Flaccomio, E., additional, Koposov, S., additional, Korn, A. J., additional, Lanzafame, A. C., additional, Pancino, E., additional, Bayo, A., additional, Damiani, F., additional, Franciosini, E., additional, Hourihane, A., additional, Lardo, C., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sacco, G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

171. TheGaia-ESO Survey: the inner disk, intermediate-age open cluster Trumpler 23

Author

Overbeek, J. C., primary, Friel, E. D., additional, Donati, P., additional, Smiljanic, R., additional, Jacobson, H. R., additional, Hatzidimitriou, D., additional, Held, E. V., additional, Magrini, L., additional, Bragaglia, A., additional, Randich, S., additional, Vallenari, A., additional, Cantat-Gaudin, T., additional, Tautvaišienė, G., additional, Jiménez-Esteban, F., additional, Frasca, A., additional, Geisler, D., additional, Villanova, S., additional, Tang, B., additional, Muñoz, C., additional, Marconi, G., additional, Carraro, G., additional, San Roman, I., additional, Drazdauskas, A., additional, Ženovienė, R., additional, Gilmore, G., additional, Jeffries, R. D., additional, Flaccomio, E., additional, Pancino, E., additional, Bayo, A., additional, Costado, M. T., additional, Damiani, F., additional, Jofré, P., additional, Monaco, L., additional, Prisinzano, L., additional, Sousa, S. G., additional, and Zaggia, S., additional

Published
2017
Full Text
View/download PDF

172. TheGaia-ESO Survey: Calibration strategy

Author

Pancino, E., primary, Lardo, C., additional, Altavilla, G., additional, Marinoni, S., additional, Ragaini, S., additional, Cocozza, G., additional, Bellazzini, M., additional, Sabbi, E., additional, Zoccali, M., additional, Donati, P., additional, Heiter, U., additional, Koposov, S. E., additional, Blomme, R., additional, Morel, T., additional, Símon-Díaz, S., additional, Lobel, A., additional, Soubiran, C., additional, Montalban, J., additional, Valentini, M., additional, Casey, A. R., additional, Blanco-Cuaresma, S., additional, Jofré, P., additional, Worley, C. C., additional, Magrini, L., additional, Hourihane, A., additional, François, P., additional, Feltzing, S., additional, Gilmore, G., additional, Randich, S., additional, Asplund, M., additional, Bonifacio, P., additional, Drew, J. E., additional, Jeffries, R. D., additional, Micela, G., additional, Vallenari, A., additional, Alfaro, E. J., additional, Allende Prieto, C., additional, Babusiaux, C., additional, Bensby, T., additional, Bragaglia, A., additional, Flaccomio, E., additional, Hambly, N., additional, Korn, A. J., additional, Lanzafame, A. C., additional, Smiljanic, R., additional, Van Eck, S., additional, Walton, N. A., additional, Bayo, A., additional, Carraro, G., additional, Costado, M. T., additional, Damiani, F., additional, Edvardsson, B., additional, Franciosini, E., additional, Frasca, A., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sacco, G. G., additional, Sbordone, L., additional, Sousa, S. G., additional, Zaggia, S., additional, and Koch, A., additional

Published
2017
Full Text
View/download PDF

174. The Gaia-ESO Survey: impact of extra mixing on C and N abundances of giant stars.

Author

Lagarde, N., Reylé, C., Robin, A. C., Tautvaišienė, G., Drazdauskas, A., Mikolaitis, Š., Minkevičiūtė, R., Stonkutė, E., Chorniy, Y., Bagdonas, V., Miglio, A., Nasello, G., Gilmore, G., Randich, S., Bensby, T., Bragaglia, A., Flaccomio, E., Francois, P., Korn, A. J., and Pancino, E.

Subjects
RED giants, MERIDIONAL overturning circulation, VERY Large Telescope (Chile), NITROGEN, METALS
Abstract

Context. The Gaia-ESO Public Spectroscopic Survey using FLAMES at the VLT has obtained high-resolution UVES spectra for a large number of giant stars, allowing a determination of the abundances of the key chemical elements carbon and nitrogen at their surface. The surface abundances of these chemical species are known to change in stars during their evolution on the red giant branch (RGB) after the first dredge-up episode, as a result of the extra mixing phenomena. Aims. We investigate the effects of thermohaline mixing on C and N abundances using the first comparison between the Gaia-ESO survey [C/N] determinations with simulations of the observed fields using a model of stellar population synthesis. Methods. We explore the effects of thermohaline mixing on the chemical properties of giants through stellar evolutionary models computed with the stellar evolution code STAREVOL. We include these stellar evolution models in the Besançon Galaxy model to simulate the [C/N] distributions determined from the UVES spectra of the Gaia-ESO survey and to compare them with the observations. Results. Theoretical predictions including the effect of thermohaline mixing are in good agreement with the observations. However, the field stars in the Gaia-ESO survey with C and N abundance measurements have a metallicity close to solar, where the efficiency of thermohaline mixing is not very large. The C and N abundances derived by the Gaia-ESO survey in open and globular clusters clearly show the impact of thermohaline mixing at low metallicity, which explains the [C/N] value observed in lower mass and older giant stars. Using independent observations of carbon isotopic ratio in clump field stars and open clusters, we also confirm that thermohaline mixing should be taken into account to explain the behaviour of 12C/13C as a function of stellar age. Conclusions. Overall, the current model including thermohaline mixing is able to reproduce very well the C and N abundances over the whole metallicity range investigated by the Gaia-ESO survey data. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

175. Non-stationary dynamo and magnetospheric accretion processes of the classical T Tauri star V2129 Oph

Author

Donati, J. F, Bouvier, J, Walter, F. M, Gregory, S. G, Skelly, M. B, Hussain, G. A. J, Flaccomio, E, Grankin, K. N, Jardine, M. M, Menard, F, Dougados, C, Romanova, M. M, the MaPP collaboration, ARGIROFFI, Costanza, Donati, J F, Bouvier, J, Walter, F M, Gregory, S G, Skelly, M B, Hussain, G A J, Flaccomio, E, Argiroffi, C, Grankin, K N, Jardine, M M, Menard, F, Dougados, C, and Romanova, M M and the MaPP collaboration

Subjects
techniques: polarimetric, stars: formation, stars: imaging, stars: individual: V2129 Oph, stars: magnetic field, stars: rotation, Settore FIS/05 - Astronomia E Astrofisica
Abstract

We report here the first results of a multiwavelength campaign focussing on magnetospheric accretion processes of the classical T Tauri star V2129 Oph. In this paper, we present spectropolarimetric observations collected in 2009 July with ESPaDOnS at the Canada-France-Hawaii Telescope and contemporaneous photometry secured with the SMARTS facility. Circularly polarized Zeeman signatures are clearly detected, both in photospheric absorption and accretion-powered emission lines, from time-series of which we reconstruct new maps of the magnetic field, photospheric brightness and accretion-powered emission at the surface of V2129 Oph using our newest tomographic imaging tool - to be compared with those derived from our old 2005 June data set, re-analysed in the exact same way. We find that in 2009 July, V2129 Oph hosts octupolar and dipolar field components of about 2.1 and 0.9 kG, respectively, both tilted by about 20° with respect to the rotation axis; we conclude that the large-scale magnetic topology changed significantly since 2005 June (when the octupole and dipole components were about 1.5 and three times weaker, respectively), demonstrating that the field of V2129 Oph is generated by a non-stationary dynamo. We also show that V2129 Oph features a dark photospheric spot and a localized area of accretion-powered emission, both close to the main surface magnetic region (hosting fields of up to about 4 kG in 2009 July). We finally obtain that the surface shear of V2129 Oph is about half as strong as solar. From the fluxes of accretion-powered emission lines, we estimate that the observed average logarithmic accretion rate (in Mȯ yr-1) at the surface of V2129 Oph is -9.2 ± 0.3 at both epochs, peaking at -9.0 at magnetic maximum. It implies in particular that the radius at which the magnetic field of V2129 Oph truncates the inner accretion disc is 0.93 and 0.50 times the corotation radius (where the Keplerian period equals the stellar rotation period) in 2009 July and 2005 June, respectively.

Published
2011

176. Testing the Ability of Field Extrapolation Models to Predict the X-ray Emission Properties of Pre-Main Sequence Stars

Author

Gregory, Scott G., Flaccomio, E., Costanza ARGIROFFI, Bouvier, J., Donati, J., Feigelson, E. D., Getman, K. V., Hussain, G. A. J., Ibrahimov, M., Jardine, M., Walter, F. M., Gregory, SG, Flaccomio, E, Argiroffi, C, Bouvier, J, Donati, J, Feigelson, ED, Getman, KV, Hussain, GAJ, Ibrahimov, M, Jardine, M, and Walter, FM

Subjects
Settore FIS/05 - Astronomia E Astrofisica, stellar activity, magnetic field, stellar coronae
Abstract

By extrapolating from observationally derived magnetic surface maps, obtained through Zeeman-Doppler imaging, models of stellar magnetospheres can be constructed. By assuming that the plasma trapped along the closed field lines is in hydrostatic equilibrium, coronal X-ray emission properties, such as the global X-ray emission measure and the amount of rotational modulation of X-ray emission, can be predicted. For pre-main sequence magnetospheres the analysis can be extended to incorporate accretion flows, and predict the amount of softer X-ray emission from accretion spots that would be observed. I will detail the preliminary results of an ambitious multi-wavelength, multi-observing site, and near contemporaneous campaign, combining spectroscopic optical, nIR, UV, X-ray (200ks, Chandra), spectropolarimetric and photometric monitoring of the accreting pre-main sequence star V2129 Oph. Surprisingly the new magnetic map derived from the 2009 data appears to indicate that the surface magnetic field has undergone little evolution since it was previously observed in 2005. The dataset also allows X-ray emission from the stellar corona and the accretion hotspots to be disentangled and crucially allows the validity, and the predictions, of the 3D field topologies derived via field extrapolation to be critically examined. SGG acknowledges support via an STFC Postdoctoral Fellowship.

Published
2010

177. The Gaia-ESO Survey: ��-abundances of metal-poor stars

Author

Jackson-Jones, R., Jofr��, P., Hawkins, K., Hourihane, A., Gilmore, G., Kordopatis, G., Worley, C., Randich, S., Vallenari, A., Bensby, T., Bragaglia, A., Flaccomio, E., Korn, A. J., Recio-Blanco, A., Smiljanic, R., Costado, M. T., Heiter, U., Hill, V., Lardo, C., de Laverny, P., Guiglion, G., Mikolaitis, S., Zaggia, S., and Tautvai��iene, G.

Subjects
Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We performed a detailed study of the ratio of low-�� to high-�� stars in the Galactic halo as observed by the Gaia-ESO Survey. Using a sample of 381 metal-poor stars from the second internal data release, we found that the value of this ratio did not show evidence of systematic trends as a function of metallicity, surface gravity, Galactic latitude, Galactic longitude, height above the Galactic plane, and Galactocentric radius. We conclude that the ��-poor/��-rich value of 0.28 $\pm$ 0.08 suggests that in the inner halo, the larger portion of stars were formed in a high star formation rate environment, and about 15% of the metal-poor stars originated from much lower star formation rate environments.

Published
2014
Full Text
View/download PDF

178. The Gaia-ESO Survey: Stellar content and elemental abundances in the massive cluster NGC 6705

Author

Cantat-Gaudin, T. Vallenari, A. Zaggia, S. Bragaglia, A. Sordo, R. Drew, J.E. Eisloeffel, J. Farnhill, H.J. Gonzalez-Solares, E. Greimel, R. Irwin, M.J. Kupcu-Yoldas, A. Jordi, C. Blomme, R. Sampedro, L. Costado, M.T. Alfaro, E. Smiljanic, R. Magrini, L. Donati, P. Friel, E.D. Jacobson, H. Abbas, U. Hatzidimitriou, D. Spagna, A. Vecchiato, A. Balaguer-Nunez, L. Lardo, C. Tosi, M. Pancino, E. Klutsch, A. Tautvaisiene, G. Drazdauskas, A. Puzeras, E. Jiménez-Esteban, F. Maiorca, E. Geisler, D. San Roman, I. Villanova, S. Gilmore, G. Randich, S. Bensby, T. Flaccomio, E. Lanzafame, A. Recio-Blanco, A. Damiani, F. Hourihane, A. Jofré, P. De Laverny, P. Masseron, T. Morbidelli, L. Prisinzano, L. Sacco, G.G. Sbordone, L. Worley, C.C.

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Context. Chemically inhomogeneous populations are observed in most globular clusters, but not in open clusters. Cluster mass seems to play a key role in the existence of multiple populations. Aims. Studying the chemical homogeneity of the most massive open clusters is needed to better understand the mechanism of their formation and determine the mass limit under which clusters cannot host multiple populations. Here we studied NGC≠6705, which is a young and massive open cluster located towards the inner region of the Milky Way. This cluster is located inside the solar circle. This makes it an important tracer of the inner disk abundance gradient. Methods. This study makes use of BVI and ri photometry and comparisons with theoretical isochrones to derive the age of NGC≠6705. We study the density profile of the cluster and the mass function to infer the cluster mass. Based on abundances of the chemical elements distributed in the first internal data release of the Gaia-ESO Survey, we study elemental ratios and the chemical homogeneity of the red clump stars. Radial velocities enable us to study the rotation and internal kinematics of the cluster. Results. The estimated ages range from 250 to 316≠Myr, depending on the adopted stellar model. Luminosity profiles and mass functions show strong signs of mass segregation. We derive the mass of the cluster from its luminosity function and from the kinematics, finding values between 3700 M and 11 000 M. After selecting the cluster members from their radial velocities, we obtain a metallicity of [Fe/H] = 0.10 ± 0.06 based on 21 candidate members. Moreover, NGC 6705 shows no sign of the typical correlations or anti-correlations between Al, Mg, Si, and Na, which are expected in multiple populations. This is consistent with our cluster mass estimate, which is lower than the required mass limit proposed in the literature to develop multiple populations. © 2014 ESO .

Published
2014

180. TheGaia-ESO Survey: revisiting the Li-rich giant problem

Author

Casey, A. R., primary, Ruchti, G., additional, Masseron, T., additional, Randich, S., additional, Gilmore, G., additional, Lind, K., additional, Kennedy, G. M., additional, Koposov, S. E., additional, Hourihane, A., additional, Franciosini, E., additional, Lewis, J. R., additional, Magrini, L., additional, Morbidelli, L., additional, Sacco, G. G., additional, Worley, C. C., additional, Feltzing, S., additional, Jeffries, R. D., additional, Vallenari, A., additional, Bensby, T., additional, Bragaglia, A., additional, Flaccomio, E., additional, Francois, P., additional, Korn, A. J., additional, Lanzafame, A., additional, Pancino, E., additional, Recio-Blanco, A., additional, Smiljanic, R., additional, Carraro, G., additional, Costado, M. T., additional, Damiani, F., additional, Donati, P., additional, Frasca, A., additional, Jofré, P., additional, Lardo, C., additional, de Laverny, P., additional, Monaco, L., additional, Prisinzano, L., additional, Sbordone, L., additional, Sousa, S. G., additional, Tautvaišienė, G., additional, Zaggia, S., additional, Zwitter, T., additional, Delgado Mena, E., additional, Chorniy, Y., additional, Martell, S. L., additional, Silva Aguirre, V., additional, Miglio, A., additional, Chiappini, C., additional, Montalban, J., additional, Morel, T., additional, and Valentini, M., additional

Published
2016
Full Text
View/download PDF

181. Gaia-ESO Survey: Gas dynamics in the Carina nebula through optical emission lines

Author

Damiani, F., primary, Bonito, R., additional, Magrini, L., additional, Prisinzano, L., additional, Mapelli, M., additional, Micela, G., additional, Kalari, V., additional, Maíz Apellániz, J., additional, Gilmore, G., additional, Randich, S., additional, Alfaro, E., additional, Flaccomio, E., additional, Koposov, S., additional, Klutsch, A., additional, Lanzafame, A. C., additional, Pancino, E., additional, Sacco, G. G., additional, Bayo, A., additional, Carraro, G., additional, Casey, A. R., additional, Costado, M. T., additional, Franciosini, E., additional, Hourihane, A., additional, Lardo, C., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Worley, C., additional, Zaggia, S., additional, Zwitter, T., additional, and Dorda, R., additional

Published
2016
Full Text
View/download PDF

182. TheGaia-ESO Survey: Probes of the inner disk abundance gradient

Author

Jacobson, H. R., primary, Friel, E. D., additional, Jílková, L., additional, Magrini, L., additional, Bragaglia, A., additional, Vallenari, A., additional, Tosi, M., additional, Randich, S., additional, Donati, P., additional, Cantat-Gaudin, T., additional, Sordo, R., additional, Smiljanic, R., additional, Overbeek, J. C., additional, Carraro, G., additional, Tautvaišienė, G., additional, San Roman, I., additional, Villanova, S., additional, Geisler, D., additional, Muñoz, C., additional, Jiménez-Esteban, F., additional, Tang, B., additional, Gilmore, G., additional, Alfaro, E. J., additional, Bensby, T., additional, Flaccomio, E., additional, Koposov, S. E., additional, Korn, A. J., additional, Pancino, E., additional, Recio-Blanco, A., additional, Casey, A. R., additional, Costado, M. T., additional, Franciosini, E., additional, Heiter, U., additional, Hill, V., additional, Hourihane, A., additional, Lardo, C., additional, de Laverny, P., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Sacco, G. G., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2016
Full Text
View/download PDF

183. TheGaia-ESO Survey: pre-main-sequence stars in the young open cluster NGC 3293

Author

Delgado, A. J., primary, Sampedro, L., additional, Alfaro, E. J., additional, Costado, M. T., additional, Yun, J. L., additional, Frasca, A., additional, Lanzafame, A. C., additional, Drew, J. E., additional, Eislöffel, J., additional, Blomme, R., additional, Morel, T., additional, Lobel, A., additional, Semaan, T., additional, Randich, S., additional, Jeffries, R. D., additional, Micela,  G., additional, Vallenari, A., additional, Kalari, V., additional, Gilmore, G., additional, Flaccomio, E., additional, Carraro,  G., additional, Lardo, C., additional, Monaco, L., additional, Prisinzano, L., additional, Sousa, S. G., additional, Morbidelli, L., additional, Lewis, J., additional, Koposov, S., additional, Hourihane, A., additional, Worley, C., additional, Casey, A., additional, Franciosini, E., additional, Sacco, G., additional, and Magrini, L, additional

Published
2016
Full Text
View/download PDF

184. TheGaia-ESO Survey: A lithium-rotation connection at 5 Myr?

Author

Bouvier, J., primary, Lanzafame, A. C., additional, Venuti, L., additional, Klutsch, A., additional, Jeffries, R., additional, Frasca, A., additional, Moraux, E., additional, Biazzo, K., additional, Messina, S., additional, Micela, G., additional, Randich, S., additional, Stauffer, J., additional, Cody, A. M., additional, Flaccomio, E., additional, Gilmore, G., additional, Bayo, A., additional, Bensby, T., additional, Bragaglia, A., additional, Carraro, G., additional, Casey, A., additional, Costado, M. T., additional, Damiani, F., additional, Delgado Mena, E., additional, Donati, P., additional, Franciosini, E., additional, Hourihane, A., additional, Koposov, S., additional, Lardo, C., additional, Lewis, J., additional, Magrini, L., additional, Monaco, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sacco, G., additional, Sbordone, L., additional, Sousa, S. G., additional, Vallenari, A., additional, Worley, C. C., additional, Zaggia, S., additional, and Zwitter, T., additional

Published
2016
Full Text
View/download PDF

187. TheGaia-ESO Survey: membership and initial mass function of theγVelorum cluster

Author

Prisinzano, L., primary, Damiani, F., additional, Micela, G., additional, Jeffries, R. D., additional, Franciosini, E., additional, Sacco, G. G., additional, Frasca, A., additional, Klutsch, A., additional, Lanzafame, A., additional, Alfaro, E. J., additional, Biazzo, K., additional, Bonito, R., additional, Bragaglia, A., additional, Caramazza, M., additional, Vallenari, A., additional, Carraro, G., additional, Costado, M. T., additional, Flaccomio, E., additional, Jofré, P., additional, Lardo, C., additional, Monaco, L., additional, Morbidelli, L., additional, Mowlavi, N., additional, Pancino, E., additional, Randich, S., additional, and Zaggia, S., additional

Published
2016
Full Text
View/download PDF

189. CSI 2264: Accretion process in classical T Tauri stars in the young cluster NGC 2264

Author

Sousa, A. P., primary, Alencar, S. H. P., additional, Bouvier, J., additional, Stauffer, J., additional, Venuti, L., additional, Hillenbrand, L., additional, Cody, A. M., additional, Teixeira, P. S., additional, Guimarães, M. M., additional, McGinnis, P. T., additional, Rebull, L., additional, Flaccomio, E., additional, Fürész, G., additional, Micela, G., additional, and Gameiro, J. F., additional

Published
2016
Full Text
View/download PDF

190. TheGaia-ESO Survey: New constraints on the Galactic disc velocity dispersion and its chemical dependencies

Author

Guiglion, G., primary, Recio-Blanco, A., additional, de Laverny, P., additional, Kordopatis, G., additional, Hill, V., additional, Mikolaitis, Š., additional, Minchev, I., additional, Chiappini, C., additional, Wyse, R. F. G., additional, Gilmore, G., additional, Randich, S., additional, Feltzing, S., additional, Bensby, T., additional, Flaccomio, E., additional, Koposov, S. E., additional, Pancino, E., additional, Bayo, A., additional, Costado, M. T., additional, Franciosini, E., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, Lewis, J., additional, Lind, K., additional, Magrini, L., additional, Morbidelli, L., additional, Sacco, G. G., additional, Ruchti, G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2015
Full Text
View/download PDF

191. TheGaia-ESO Survey: characterisation of the [α/Fe] sequences in the Milky Way discs

Author

Kordopatis, G., primary, Wyse, R. F. G., additional, Gilmore, G., additional, Recio-Blanco, A., additional, de Laverny, P., additional, Hill, V., additional, Adibekyan, V., additional, Heiter, U., additional, Minchev, I., additional, Famaey, B., additional, Bensby, T., additional, Feltzing, S., additional, Guiglion, G., additional, Korn, A. J., additional, Mikolaitis, Š., additional, Schultheis, M., additional, Vallenari, A., additional, Bayo, A., additional, Carraro, G., additional, Flaccomio, E., additional, Franciosini, E., additional, Hourihane, A., additional, Jofré, P., additional, Koposov, S. E., additional, Lardo, C., additional, Lewis, J., additional, Lind, K., additional, Magrini, L., additional, Morbidelli, L., additional, Pancino, E., additional, Randich, S., additional, Sacco, G. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2015
Full Text
View/download PDF

192. TheGaia-ESO Survey: chemical signatures of rocky accretion in a young solar-type star

Author

Spina, L., primary, Palla, F., additional, Randich, S., additional, Sacco, G., additional, Jeffries, R., additional, Magrini, L., additional, Franciosini, E., additional, Meyer, M. R., additional, Tautvaišienė, G., additional, Gilmore, G., additional, Alfaro, E. J., additional, Allende Prieto, C., additional, Bensby, T., additional, Bragaglia, A., additional, Flaccomio, E., additional, Koposov, S. E., additional, Lanzafame, A. C., additional, Costado, M. T., additional, Hourihane, A., additional, Lardo, C., additional, Lewis, J., additional, Monaco, L., additional, Morbidelli, L., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2015
Full Text
View/download PDF

193. The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264.

Author

Venuti, L., Prisinzano, L., Sacco, G. G., Flaccomio, E., Bonito, R., Damiani, F., Micela, G., Guarcello, M. G., Randich, S., Stauffer, J. R., Cody, A. M., Jeffries, R. D., Alencar, S. H. P., Alfaro, E. J., Lanzafame, A. C., Pancino, E., Bayo, A., Carraro, G., Costado, M. T., and Frasca, A.

Subjects
STAR clusters, ORIGIN of planets, STELLAR evolution, DISKS (Astrophysics), STELLAR structure, STAR formation
Abstract

Context. Reconstructing the structure and history of young clusters is pivotal to understanding the mechanisms and timescales of early stellar evolution and planet formation. Recent studies suggest that star clusters often exhibit a hierarchical structure, possibly resulting from several star formation episodes occurring sequentially rather than a monolithic cloud collapse. Aims. We aim to explore the structure of the open cluster and star-forming region NGC 2264 (~3 Myr), which is one of the youngest, richest and most accessible star clusters in the local spiral arm of our Galaxy; we link the spatial distribution of cluster members to other stellar properties such as age and evolutionary stage to probe the star formation history within the region. Methods. We combined spectroscopic data obtained as part of the Gaia-ESO Survey (GES) with multi-wavelength photometric data from the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264) campaign. We examined a sample of 655 cluster members, with masses between 0.2 and 1.8 M☉ and including both disk-bearing and disk-free young stars. We used Teff estimates from GES and g; r; i photometry from CSI 2264 to derive individual extinction and stellar parameters. Results. We find a significant age spread of 4-5 Myr among cluster members. Disk-bearing objects are statistically associated with younger isochronal ages than disk-free sources. The cluster has a hierarchical structure, with two main blocks along its latitudinal extension. The northern half develops around the O-type binary star S Mon; the southern half, close to the tip of the Cone Nebula, contains the most embedded regions of NGC 2264, populated mainly by objects with disks and ongoing accretion. The median ages of objects at di erent locations within the cluster, and the spatial distribution of disked and non-disked sources, suggest that star formation began in the north of the cluster, over 5 Myr ago, and was ignited in its southern region a few Myr later. Star formation is likely still ongoing in the most embedded regions of the cluster, while the outer regions host a widespread population of more evolved objects; these may be the result of an earlier star formation episode followed by outward migration on timescales of a few Myr. We find a detectable lag between the typical age of disk-bearing objects and that of accreting objects in the inner regions of NGC 2264: the first tend to be older than the second, but younger than disk-free sources at similar locations within the cluster. This supports earlier findings that the characteristic timescales of disk accretion are shorter than those of disk dispersal, and smaller than the average age of NGC 2264 (i.e., ≲3 Myr). At the same time, we note that disks in the north of the cluster tend to be shorter-lived (~2.5 Myr) than elsewhere; this may reflect the impact of massive stars within the region (notably S Mon), that trigger rapid disk dispersal. Conclusions. Our results, consistent with earlier studies on NGC 2264 and other young clusters, support the idea of a star formation process that takes place sequentially over a prolonged span in a given region. A complete understanding of the dynamics of formation and evolution of star clusters requires accurate astrometric and kinematic characterization of its population; significant advance in this field is foreseen in the upcoming years thanks to the ongoing Gaia mission, coupled with extensive ground-based surveys like GES. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

194. The Gaia-ESO Public Spectroscopic Survey

Author

Gilmore, G., Randich, S., Asplund, M., Binney, J., Bonifacio, P., Drew, J., Feltzing, S., Ferguson, A., Jeffries, R., Micela, G., Negueruela, I., Prusti, T., Rix, H. -W., Vallenari, A., Alfaro, E., Allende-Prieto, C., Babusiaux, C., Bensby, T., Blomme, R., Bragaglia, A., Flaccomio, E., François, P., Irwin, M., Koposov, S., Korn, A., Lanzafame, A., Pancino, E., Paunzen, E., Collins, M., Eriksson, K., Fiorentino, G., Gonzalez Hernandez, J., Groenewegen, M., Hansen, C., Helmi, A., de Jong, R., Jonker, P., Koch, A., van Leeuwen, F., Lemasle, B., Ludwig, H., Messina, S., Meyer, M., De Ridder, J., Robin, A., Sharma, S., Smith, M., Steffen, M., Tolstoy, E., Vink, J., Astronomy, Research unit Nuclear & Hadron Physics, and Research unit Astroparticle Physics

Published
2012

195. The Gaia-ESO Public Spectroscopic Survey

Author

Gilmore, G, Randich, S, Asplund, M, Binney, J, Bonifacio, P, Drew, J, Feltzing, S, Ferguson, A, Jeffries, R, Micela, G, Negueruela, I, Prusti, T, Rix, H. W., Vallenari, A, Alfaro, E, Allende Prieto, C, Babusiaux, C, Bensby, T, Blomme, R, Bragaglia, A, Flaccomio, E, François, P, Irwin, M, Koposov, S, Korn, A, Lanzafame, Alessandro Carmelo, Pancino, E, Paunzen, E, Recio Blanco, A, Sacco, G, Smiljanic, R, Van Eck, S, and Walton, N.

Subjects
Stars formation, Galactic Astronomy, Astrophysics
Published
2012

196. KINEMATICS AND CHEMISTRY OF RECENTLY DISCOVERED RETICULUM 2 AND HOROLOGIUM 1 DWARF GALAXIES

Author

Koposov, Sergey E., primary, Casey, Andrew R., additional, Belokurov, Vasily, additional, Lewis, James R., additional, Gilmore, Gerard, additional, Worley, Clare, additional, Hourihane, Anna, additional, Randich, S., additional, Bensby, T., additional, Bragaglia, A., additional, Bergemann, M., additional, Carraro, G., additional, Costado, M. T., additional, Flaccomio, E., additional, Francois, P., additional, Heiter, U., additional, Hill, V., additional, Jofre, P., additional, Lando, C., additional, Lanzafame, A. C., additional, Laverny, P. de, additional, Monaco, L., additional, Morbidelli, L., additional, Sbordone, L., additional, Mikolaitis, Š., additional, and Ryde, N., additional

Published
2015
Full Text
View/download PDF

198. TheGaia-ESO Survey: Catalogue of Hαemission stars

Author

Traven, G., primary, Zwitter, T., additional, Van Eck, S., additional, Klutsch, A., additional, Bonito, R., additional, Lanzafame, A. C., additional, Alfaro, E. J., additional, Bayo, A., additional, Bragaglia, A., additional, Costado, M. T., additional, Damiani, F., additional, Flaccomio, E., additional, Frasca, A., additional, Hourihane, A., additional, Jimenez-Esteban, F., additional, Lardo, C., additional, Morbidelli, L., additional, Pancino, E., additional, Prisinzano, L., additional, Sacco, G. G., additional, and Worley, C. C., additional

Published
2015
Full Text
View/download PDF

199. TheGaia-ESO Survey: Insights into the inner-disc evolution from open clusters

Author

Magrini, L., primary, Randich, S., additional, Donati, P., additional, Bragaglia, A., additional, Adibekyan, V., additional, Romano, D., additional, Smiljanic, R., additional, Blanco-Cuaresma, S., additional, Tautvaišienė, G., additional, Friel, E., additional, Overbeek, J., additional, Jacobson, H., additional, Cantat-Gaudin, T., additional, Vallenari, A., additional, Sordo, R., additional, Pancino, E., additional, Geisler, D., additional, San Roman, I., additional, Villanova, S., additional, Casey, A., additional, Hourihane, A., additional, Worley, C. C., additional, Francois, P., additional, Gilmore, G., additional, Bensby, T., additional, Flaccomio, E., additional, Korn, A. J., additional, Recio-Blanco, A., additional, Carraro, G., additional, Costado, M. T., additional, Franciosini, E., additional, Heiter, U., additional, Jofré, P., additional, Lardo, C., additional, de Laverny, P., additional, Monaco, L., additional, Morbidelli, L., additional, Sacco, G., additional, Sousa, S. G., additional, and Zaggia, S., additional

Published
2015
Full Text
View/download PDF

200. TheGaia-ESO Survey: Empirical determination of the precision of stellar radial velocities and projected rotation velocities

Author

Jackson, R. J., primary, Jeffries, R. D., additional, Lewis, J., additional, Koposov, S. E., additional, Sacco, G. G., additional, Randich, S., additional, Gilmore, G., additional, Asplund, M., additional, Binney, J., additional, Bonifacio, P., additional, Drew, J. E., additional, Feltzing, S., additional, Ferguson, A. M. N., additional, Micela, G., additional, Neguerela, I., additional, Prusti, T., additional, Rix, H.-W., additional, Vallenari, A., additional, Alfaro, E. J., additional, Allende Prieto, C., additional, Babusiaux, C., additional, Bensby, T., additional, Blomme, R., additional, Bragaglia, A., additional, Flaccomio, E., additional, Francois, P., additional, Hambly, N., additional, Irwin, M., additional, Korn, A. J., additional, Lanzafame, A. C., additional, Pancino, E., additional, Recio-Blanco, A., additional, Smiljanic, R., additional, Van Eck, S., additional, Walton, N., additional, Bayo, A., additional, Bergemann, M., additional, Carraro, G., additional, Costado, M. T., additional, Damiani, F., additional, Edvardsson, B., additional, Franciosini, E., additional, Frasca, A., additional, Heiter, U., additional, Hill, V., additional, Hourihane, A., additional, Jofré, P., additional, Lardo, C., additional, de Laverny, P., additional, Lind, K., additional, Magrini, L., additional, Marconi, G., additional, Martayan, C., additional, Masseron, T., additional, Monaco, L., additional, Morbidelli, L., additional, Prisinzano, L., additional, Sbordone, L., additional, Sousa, S. G., additional, Worley, C. C., additional, and Zaggia, S., additional

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results