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Your search keyword '"Scilla Degl’Innocenti"' showing total 4 results
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4 results on '"Scilla Degl’Innocenti"'

1. On the Metamorphosis of the Bailey Diagram for RR Lyrae Stars

Author

E. Di Carlo, Matteo Monelli, George W. Preston, S. Marinoni, Bertrand Lemasle, Brian Chaboyer, J. P. Mullen, R. da Silva, Adriano Pietrinferni, J. Crestani, Giuseppe Bono, Marcella Marconi, Laura Inno, Z. Prudil, P. M. Marrese, Scilla Degl'Innocenti, I. Ferraro, Alistair R. Walker, Andrea Kunder, Christopher Sneden, Jillian R. Neeley, G. Altavilla, Frédéric Thévenin, Emanuele Tognelli, Mario Nonino, P. G. Prada Moroni, Massimo Dall'Ora, Giuliana Fiorentino, R. Buonanno, E. Valenti, V. V. Kovtyukh, C. K. Gilligan, Massimo Marengo, G. Iannicola, Peter B. Stetson, C. E. Martínez-Vázquez, Eva K. Grebel, Noriyuki Matsunaga, M. Fabrizio, Vittorio F. Braga, Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radial velocity, RR Lyrae variable stars, 010504 meteorology & atmospheric sciences, Blazhko effect, FOS: Physical sciences, Astrophysics, RR Lyrae variable, 01 natural sciences, Horizontal branch stars, symbols.namesake, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, Settore FIS/05, Balmer series, Astronomy and Astrophysics, Effective temperature, Horizontal branch, Stellar oscillations, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Amplitude, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), symbols, Instability strip, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We collected over 6000 high-resolution spectra of four dozen field RR Lyrae (RRL) variables pulsating either in the fundamental (39 RRab) or in the first overtone (9 RRc) mode. We measured radial velocities (RVs) of four strong metallic and four Balmer lines along the entire pulsational cycle and derived RV amplitudes with accuracies better than 1$-$2~\kmsec. The new amplitudes were combined with literature data for 23~RRab and 3~RRc stars (total sample 74 RRLs) which allowed us to investigate the variation of the Bailey diagram (photometric amplitude versus period) when moving from optical to mid-infrared bands and to re-cast the Bailey diagram in terms of RV amplitudes. We found that RV amplitudes for RRab are minimally affected by nonlinear phenomena (shocks) and multi-periodicity (Blazhko effect). The RV slope ($\log P$--A(V$_r$)) when compared with the visual slope ($\log P$--A($V$)) is shallower and the dispersion, at fixed period, decreases by a factor of two. We constructed homogeneous sets of Horizontal Branch evolutionary models and nonlinear, convective pulsation models of RRLs to constrain the impact of evolutionary effects on their pulsation properties. Evolution causes, on the Bailey diagram based on RV amplitudes, a modest variation in pulsation period and a large dispersion in amplitude. The broad dispersion in period of the Bailey diagram is mainly caused by variation in RRL intrinsic parameters (stellar mass, chemical composition). Empirical evidence indicates that RV amplitudes are an optimal diagnostic for tracing the mean effective temperature across the RRab instability strip., 14 pages, 4 figures, 1 table, Accepted on ApJ Letter

Published
2020
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2. The Gaia -ESO survey: Calibrating a relationship between age and the [C/N] abundance ratio with open clusters

Author

E. Tognelli, M. Van der Swaelmen, Gerry Gilmore, G. Casali, E. Pancino, Sofia Feltzing, Ulrike Heiter, Paula Jofre, A. Bragaglia, R. Bonito, Veronica Roccatagliata, Nicoletta Sanna, Simone Zaggia, F. M. Jiménez-Esteban, Maria Bergemann, Antonio Frasca, R. J. Jackson, Scilla Degl'Innocenti, Antonella Vallenari, Christian L. Sahlholdt, P. G. Prada Moroni, E. Franciosini, Thomas Bensby, Šarūnas Mikolaitis, Loredana Prisinzano, E. Stonkute, John D. Lewis, Y. Chorniy, V. Bagdonas, L. Morbidelli, Nadège Lagarde, G. Carraro, Arnas Drazdauskas, Sofia Randich, Grazina Tautvaisiene, A. C. Lanzafame, Lorenzo Spina, G. G. Sacco, Andreas Korn, S. G. Sousa, Rodolfo Smiljanic, S. L. Martell, Francesco Damiani, Thomas Masseron, Sergey E. Koposov, R. Minkeviciute, A. Hourihane, E. Friel, R. D. Jeffries, Amelia Bayo, Laura Magrini, C. C. Worley, G. Kordopatis, Anais Gonneau, INAF - Osservatorio Astrofisico di Arcetri (OAA), Istituto Nazionale di Astrofisica (INAF), Keele University [Keele], Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Institute of Astronomy [Cambridge], University of Cambridge [UK] (CAM), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astronomico di Bologna (OABO), Lund Observatory, Lund University [Lund], Monash University [Clayton], INAF - Osservatorio Astronomico di Padova (OAPD), Department of Astronomy and Space Physics [Uppsala], Uppsala University, University of Turin, Istituto di Astrofisica Spaziale e Fisica cosmica - Palermo (IASF-Pa), INAF - Osservatorio Astrofisico di Catania (OACT), Gilmore, Gerard [0000-0003-4632-0213], Worley, Clare [0000-0001-9310-2898], and Apollo - University of Cambridge Repository

Subjects
010504 meteorology & atmospheric sciences, Metallicity, astro-ph.GA, Galaxy: abundances, Galaxy: disk, Open clusters and associations: general, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Astronomi, astrofysik och kosmologi, Nucleosynthesis, 0103 physical sciences, QB460, Astronomy, Astrophysics and Cosmology, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Astrophysics::Instrumentation and Methods for Astrophysics, abundances [Galaxy], Astronomy and Astrophysics, Surface gravity, Giant star, Astrophysics - Astrophysics of Galaxies, Red-giant branch, Stars, Star cluster, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), general [open clusters and associations], Astrophysics::Earth and Planetary Astrophysics, disk [Galaxy], Open cluster, QB799
Abstract

In the era of large high-resolution spectroscopic surveys, high-quality spectra can contribute to our understanding of the Galactic chemical evolution, providing chemical abundances belonging to the different nucleosynthesis channels, and also providing constraints to stellar age. Some abundance ratios have been proven to be excellent indicators of stellar ages. We aim at providing an empirical relationship between stellar ages and [C/N] using, as calibrators, open star clusters observed by both the Gaia-ESO and APOGEE surveys. We use stellar parameters and abundances from the Gaia-ESO and APOGEE of the Galactic field and open cluster stars. Ages of star clusters are retrieved from the literature sources and validated using a common set of isochrones. We use the same isochrones to determine, for each age and metallicity, the surface gravity at which the first dredge-up and red giant branch bump occur. We study the effect of extra-mixing processes in our sample of giant stars, and we derive the mean [C/N] in evolved stars, including only stars without evidence of extra-mixing. Combining the Gaia-ESO and APOGEE samples of open clusters, we derive a linear relationship between [C/N] and logarithmic cluster ages. We apply our relationship to selected giant field stars in both Gaia-ESO and APOGEE. We find an age separation between thin and thick disc stars and age trends within their populations, with an increasing age towards lower metallicity populations. With such empirical relationship, we are able to provide an age estimate for giant stars in which C and N abundances are measured. Isochrone fitting is less sensitive for giant than dwarf stars at the turn off. The present method can be thus considered as an additional tool to give an independent estimate of the age of giant stars, with uncertainties in their ages comparable to those obtained using isochrone fitting for dwarf stars., Comment: 28 pages, 24 figures. Accepted by A&A

Published
2019
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3. CoRoT observations of the young open cluster Dolidze 25

Author

Davide Gandolfi, A. Ruoppo, Carlos A. O. Torres, W. S. Corradi, Marcella Marconi, P. G. Prada Moroni, Silvia H. P. Alencar, R. de la Reza, Vincenzo Ripepi, J. D. R. Lepine, E. W. Guenter, Felice Cusano, Fernando J G Pinheiro, Jane Gregorio-Hetem, Matilde Fernández, Silvio Leccia, J. M. Alcalá, Werner W. Weiss, A. Baglin, S. Bernabei, Scilla Degl'Innocenti, C. Catala, T. Boehm, Franco Palla, Mário J. P. F. G. Monteiro, Germano R. Quast, C. Chavero, M. Deluil, F. Favata, Konstanze Zwintz, Laboratoire d'Astrophysique de Marseille (LAM), and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astronomy, 020206 networking & telecommunications, Astronomy and Astrophysics, 02 engineering and technology, Astrophysics, Light curve, 01 natural sciences, Stars, Space and Planetary Science, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Periodogram, 010303 astronomy & astrophysics, Open cluster
Abstract

International audience; We present some preliminary results based on the CoRoT observations of the young distant cluster Dolidze 25. The light curve for the 28 stars observed by the satellite have been analyzed and the relevant periodogram presented. As a result we have found two binary, three Pulsating Be, three SPB, two Spotted and one ellipsoidal variables. Noteworthy, we have also identified one PMS delta Scuti candidate.

Published
2010
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4. A compilation of charged-particle induced thermonuclear reaction rates

Author

Pierre Descouvemont, C. Rolfs, S. Kossionides, P. Aguer, Sandra Zavatarelli, S. Barhoumi, Javad Rahighi, A. C. Shotter, Scilla Degl'Innocenti, M. Lamehi Rachti, Daniel Jean Baye, R. Kunz, Alain Coc, K. Spyrou, T. Paradellis, Marc Rayet, A. Mayer, Barbara Ricci, J. W. Hammer, Helmut Wolters, Constança Providência, Carmen Angulo, Ch. Leclercq-Willain, Giovanni Fiorentini, J. Soares, Marcel Arnould, C. Chronidou, C. Grama, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Lorgeril, Jocelyne

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, CNO cycle, Range (particle radiation), [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, S-factor, Maxwell–Boltzmann statistics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Nuclear physics, Nucleosynthesis, 0103 physical sciences, Atomic physics, Ground state, 010303 astronomy & astrophysics
Abstract

Low-energy cross section data for 86 charged-particle induced reactions involving light (1 less than or equal to Z less than or equal to 14), mostly stable, nuclei are compiled. The corresponding Maxwellian-averaged thermonuclear reaction rates of relevance in astrophysical plasmas at temperatures in the range from 10(6) K to 10(10) K are calculated. These evaluations assume either that the target nuclei are in their ground state, or that the target states are thermally populated following a Maxwell-Boltzmann distribution, except in some cases involving isomeric states. Adopted values complemented with lower and upper limits of the rates are presented in tabular form. Analytical approximations to the adopted rates, as well as to the inverse/direct rate ratios, are provided. (C) 1999 Elsevier Science B.V. All rights reserved.

Published
1999

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