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Evolution of the theoretical power spectrum of solar-like oscillations along the ascending phase on the red giant branch.
Grosjean, Mathieu; Dupret, Marc-Antoine; Belkacem, Kevin et al.
2013In Astronomical Society of the Pacific Conference Series, 479, p. 191
 

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Keywords :
Asteroseismology; Red giants; Solar-like oscillation
Abstract :
[en] CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. An important question comes from the observation of mixed modes : When during the star’s ascension on the RGB are mixed-modes more likely to be detectable ? We follow the evolution of a star on the RGB and investigate the effect of its ascension on theoretical power spectrum. Equilibrium models (computed with the code ATON) represent four different stages of a star on the RGB. The mass of the star (1.5M") is in the typical mass range of stars observed by CoRoT and Kepler. We used a non-radial non-adiabatic code to compute the theoretical solar-like oscillations of these models. An important output of these calculations is the theoretical lifetimes of the modes. Then we computed the oscillation amplitudes through a stochastic excitation model. These computations allow us to draw theoretical power spectrum and discuss the possibility to observe mixed-modes at different evolutionary stages on the RGB. We found that structure modifications in a star ascending the RGB have an important impact on theoretical power spectrum of solar-like oscillations. Efficiencies of trapping and lifetimes of mixed modes are indeed strongly affected by this evolution.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Grosjean, Mathieu ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Belkacem, Kevin;  Observatoire de Paris-Meudon > LESIA
Montalban Iglesias, Josefa ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Samadi, Reza;  Observatoire de Paris-Meudon > LESIA
Language :
English
Title :
Evolution of the theoretical power spectrum of solar-like oscillations along the ascending phase on the red giant branch.
Publication date :
December 2013
Event name :
Progress in physics of the sun and stars: a new era in helio- and asteroseismology
Event date :
du 25 novembre 2012 au 29 novembre 2012
Audience :
International
Journal title :
Astronomical Society of the Pacific Conference Series
ISSN :
1050-3390
Publisher :
Astronomical Society of the Pacific, San Francisco, United States - California
Special issue title :
Progress in Physics of the Sun and Stars: A New Era in Helio- and Asteroseismology. Proceedings of a Fujihara Seminar
Volume :
479
Pages :
191
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 27 August 2013

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