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13 results on '"Régulo, C"'

1. Global asteroseismic properties of solar-like oscillations observed by Kepler : A comparison of complementary analysis methods

Author

Verner, G.A., Roxburgh, I.W., Elsworth, Y., Chaplin, W.J., Hekker, S., Broomhall, A.-M., Campante, T.L., Karoff, C., Handberg, R., Corsaro, E., Bonanno, A., Gaulme, P., Appourchaux, T., Stello, D., Huber, D., Bedding, T.R., White, T.R., Mathur, S., Mosser, B., Ballot, J., García, R.A., New, R., Régulo, C., Salabert, D., Caldwell, D.A., Christiansen, J.L., Fanelli, M.N., Low Energy Astrophysics (API, FNWI), Astronomy Unit, Queen Mary, School of Physics and Astronomy, University of Birmingham, Centro de Astrofisica da Universidade do Porto (CAUP), INAF-Osservatorio Astrofisico di Catania (INAF-OACt), Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Sydney Institute for Astronomy (SIfA), Danish AsteroSeismology Centre (DASC), High Altitude Observatory, National Center for Atmospheric Research, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Etoile, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Faculty of Arts, Computing, Engineering and Sciences, Astronomical Institute Anton Pannekoek, University of Amsterdam, Instituto de Astrofísica de Canarias (IAC), SETI Institute, NASA Ames Research Center, Moffett Field, and Bay Area Environmental Research Institute/NASA Ames Research Center, Moffett Field

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics::Galaxy Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

We present the asteroseismic analysis of 1948 F-, G- and K-type main-sequence and subgiant stars observed by the NASA {\em Kepler Mission}. We detect and characterise solar-like oscillations in 642 of these stars. This represents the largest cohort of main-sequence and subgiant solar-like oscillators observed to date. The photometric observations are analysed using the methods developed by nine independent research teams. The results are combined to validate the determined global asteroseismic parameters and calculate the relative precision by which the parameters can be obtained. We correlate the relative number of detected solar-like oscillators with stellar parameters from the {\em Kepler Input Catalog} and find a deficiency for stars with effective temperatures in the range $5300 \lesssim T_\mathrm{eff} \lesssim 5700$\,K and a drop-off in detected oscillations in stars approaching the red edge of the classical instability strip. We compare the power-law relationships between the frequency of peak power, $\nu_\mathrm{max}$, the mean large frequency separation, $\Delta\nu$, and the maximum mode amplitude, $A_\mathrm{max}$, and show that there are significant method-dependent differences in the results obtained. This illustrates the need for multiple complementary analysis methods to be used to assess the robustness and reproducibility of results derived from global asteroseismic parameters., Comment: 14 pages, 9 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society

Published
2011
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5. Differential Seismic Modeling of Stars

Author

Ozel, N., Mosser, B., Dupret, M. -A, Bruntt, H., Barban, C., Deheuvels, S., Rafael A. García, Michel, E., Samadi, R., Baudin, F., Régulo, C., Auvergne, M., Baglin, A., Catala, C., Morel, P., and Pichon, B.

6. Investigating the Properties of Granulation in the Red Giants Observed by Kepler

Author

Mathur, S., Hekker, S., Trampedach, R., Ballot, J., Kallinger, T., Buzasi, D., Rafael A. García, Huber, D., Jiménez, A., Mosser, B., Bedding, T. R., Elsworth, Y., Régulo, C., Stello, D., Chaplin, W. J., Ridder, J., Hale, S. J., Kinemuchi, K., Kjeldsen, H., Mullally, F., and Thompson, S. E.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

More than 1000 red giants have been observed by NASA/Kepler mission during a nearly continuous period of ~ 13 months. The resulting high-frequency resolution (< 0.03 muHz) allows us to study the granulation parameters of these stars. The granulation pattern results from the convection motions leading to upward flows of hot plasma and downward flows of cooler plasma. We fitted Harvey-like functions to the power spectra, to retrieve the timescale and amplitude of granulation. We show that there is an anti-correlation between both of these parameters and the position of maximum power of acoustic modes, while we also find a correlation with the radius, which agrees with the theory. We finally compare our results with 3D models of the convection., 4 pages, 1 figure. To appear in the ASP proceedings of "The 61st Fujihara seminar: Progress in solar/stellar physics with helio- and asteroseismology", 13th-17th March 2011, Hakone, Japan

9. Investigating Stellar Activity with CoRoT Observations

Author

Mathur, S., Salabert, D., García, R. A., Régulo, C., Ballot, J., and Travis Metcalfe

Subjects
Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Recently, the study of the CoRoT target HD 49933 showed evidence of variability of its magnetic activity. This was the first time that a stellar activity was detected using asteroseismic data. For the Sun and HD 49933, we observe an increase of the p-mode frequencies and a decrease of the maximum amplitude per radial mode when the activity level is higher. Moreover a similar behavior of the frequency shifts with frequency has been found between the Sun and HD 49933. We study 3 other targets of CoRoT as well, for which modes have been detected and well identified: HD 181420, HD 49385, and HD 52265 (which is hosting a planet). We show how the seismic parameters (frequency shifts and amplitude) vary during the observation of these stars., Comment: 4 pages. To appear in the ASP proceedings of "The 61st Fujihara seminar: Progress in solar/stellar physics with helio- and asteroseismology", 13th-17th March 2011, Hakone, Japan

10. Asteroseismic Analysis of the CoRoT Target HD 169392

Author

Mathur, S., Bruntt, H., Catala, C., Benomar, O., Davies, G. R., García, R. A., Salabert, D., Ballot, J., Mosser, B., Régulo, C., Chaplin, W. J., Elsworth, Y., Rasmus Handberg, Hekker, S., Mantegazza, L., Michel, E., Poretti, E., Rainer, M., Roxburgh, I. W., Samadi, R., Steslicki, M., Uytterhoeven, K., Verner, G. A., Auvergne, M., Baglin, A., Barceló Forteza, S., Baudin, F., and Roca Cortés, T.

Subjects
Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

The satellite CoRoT (Convection, Rotation, and planetary Transits) has provided high-quality data for almost six years. We show here the asteroseismic analysis and modeling of HD169392A, which belongs to a binary system weakly gravitationally bound as the distance between the two components is of 4250 AU. The main component, HD169392A, is a G0IV star with a magnitude of 7.50 while the second component is a G0V-G2IV star with a magnitude of 8.98. This analysis focuses on the main component, as the secondary one is too faint to measure any seismic parameters. A complete modeling has been possible thanks to the complementary spectroscopic observations from HARPS, providing Teff=5985+/-60K, log g=3.96+/-0.07, and [Fe/H]=- 0.04+/-0.10., 6 pages, 1 figure. Proceedings of the Fujihara seminar held in Hakone (Japan) in November 2012

12. On the nature of the current GOLF p-mode signal

Author

Pallé, P. L., Régulo, C., Roca Cortés, T., Rafael A. García, Jiménez, A., Boumier, P., Gabriel, A., Grec, G., Robillot, J. M., Turck-Chièze, S., Ulrich, R. K., and Soi, Team

13. 3-D Helioseismology: Rings and horizontal flows

Author

Patrón, J., González Hernández, I., Jiménez, A., Sebastián Jiménez Reyes, Martín, I., Pallé, P. L., Pérez Hernández, F., Régulo, C., and Roca-Cortés, T.

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