Reference : Non-radial, non-adiabatic solar-like oscillations in RGB and HB stars
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/130998
Non-radial, non-adiabatic solar-like oscillations in RGB and HB stars
English
[fr] Oscillations non-radiales de type solaire, dans les étoiles de la RGB et de la branche horizontale : Calculs non-adiabatiques.
Grosjean, Mathieu mailto [Université de Liège - ULg > > > Form. doct. sc. (sc. spatiales - Bologne)]
Dupret, Marc-Antoine mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Belkacem, Kevin []
Montalban Iglesias, Josefa mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Noels-Grötsch, Arlette mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Samadi, Réza []
Jul-2012
A0
No
No
International
40th Liège International Astrophysical Colloquium
du 9 au 13 juillet 2012
Liège
Belgique
[en] Asteroseismology ; red giants ; solar-like oscillations
[en] Corot and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. We compare the theoretical spectrum (amplitudes and life- times) of two red giants in the same region of the HR diagram but in different evolutionary phases. The lifetimes are obtained by computing theoretical non-adiabatic non-radial solar-like oscillations for mixed modes in the two models. Thanks to this, we have been able to compute the oscillation amplitudes through a stochastic excitation model. We present here our first results on the inertia, damping rates and amplitudes of the oscillations in the two stars and discuss the trapping, the visibilities and the am- plitudes of the different modes. The differences in the spectra of the two stars are also investigated. As already known, the period spacings in the two models are very different. Moreover, we find significant differences in amplitudes and lifetimes between the two models.
Groupe d'Astrophysique Stellaire Théorique et Astérosismologie
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Energetic study of solar-like oscillations in red-giants
Researchers ; Professionals
http://hdl.handle.net/2268/130998

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