Reference : Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/108395
Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars
English
Baudin, F. [Institut d'Astrophysique Spatiale, CNRS, Université Paris XI, 91405, Orsay Cedex, France]
Barban, C. [LESIA, Université Pierre et Marie Curie, Université Denis Diderot, Obs. de Paris, 92195, Meudon Cedex, France]
Belkacem, K. [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, 4000, Liège, Belgium; LESIA, Université Pierre et Marie Curie, Université Denis Diderot, Obs. de Paris, 92195, Meudon Cedex, France]
Hekker, S. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK; Astronomical Institute "Anton Pannekoek", University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands]
Morel, Thierry mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)]
Samadi, R. [LESIA, Université Pierre et Marie Curie, Université Denis Diderot, Obs. de Paris, 92195, Meudon Cedex, France]
Benomar, O. [Institut d'Astrophysique Spatiale, CNRS, Université Paris XI, 91405, Orsay Cedex, France]
Goupil, M*-J [LESIA, Université Pierre et Marie Curie, Université Denis Diderot, Obs. de Paris, 92195, Meudon Cedex, France]
Carrier, F. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Ballot, J. [Institut de Recherche en Astrophysique et Planétologie, CNRS, Université de Toulouse, 31400, Toulouse, France]
Deheuvels, S. [LESIA, Université Pierre et Marie Curie, Université Denis Diderot, Obs. de Paris, 92195, Meudon Cedex, France]
De Ridder, J. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Hatzes, A. P. [Thüringer Landessternwarte, 07778, Tautenburg, Germany]
Kallinger, T. [University of Vienna, Institute for Astronomy,, Türkenschanzstrasse 17, 1180, Vienna, Austria; Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC, V6T 1Z1, Canada]
Weiss, W. W. [University of Vienna, Institute for Astronomy,, Türkenschanzstrasse 17, 1180, Vienna, Austria]
2011
Astronomy and Astrophysics
EDP Sciences
529
84
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] stars: oscillations ; methods: data analysis ; asteroseismology
[en] Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main-sequence stars.
Aims: Based on several hundred identified pulsating red giants, we aim to characterize their oscillation amplitudes and widths. These observables are compared with those of main-sequence stars in order to test trends and scaling laws for these parameters for main-sequence stars and red giants.
Methods: An automated fitting procedure is used to analyze several hundred Fourier spectra. For each star, a modeled spectrum is fitted to the observed oscillation spectrum, and mode parameters are derived.
Results: Amplitudes and widths of red-giant solar-like oscillations are estimated for several hundred modes of oscillation. Amplitudes are relatively high (several hundred ppm) and widths relatively small (very few tenths of a μHz).
Conclusions: Widths measured in main-sequence stars show a different variation with the effective temperature from red giants. A single scaling law is derived for mode amplitudes of red giants and main-sequence stars versus their luminosity to mass ratio. However, our results suggest that two regimes may also be compatible with the observations.
http://hdl.handle.net/2268/108395
10.1051/0004-6361/201014037
http://adsabs.harvard.edu/abs/2011A%26A...535C...1B
dx.doi.org/10.1051/0004-6361/201014037e

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