[en] The clear detection with CoRoT and Kepler of radial and non-radial solar-like oscillations in many red giants paves the way to seismic inferences on the structure of such stars. We present an overview of the properties of the adiabatic frequencies and frequency separations of radial and non-radial oscillation modes, highlighting how their detection allows a deeper insight into the properties of the internal structure of red giants. In our study we consider models of red giants in different evolutionary stages, as well as of different masses and chemical composition. We describe how the large and small separations computed with radial modes and with non-radial modes mostly trapped in the envelope depend on the stellar global parameters and evolutionary state, and we compare our theoretical predictions and first Kepler data.Finally, we find that the properties of dipole modes constitute a promising seismic diagnostic of the evolutionary state of red-giant stars.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Montalban Iglesias, Josefa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Miglio, Andrea ; Institut d'Astrophysique et Géophysique de l'Université de Liège, Allée du six Août, 17 B-4000 Liège, Belgium ; Chargé de Recherches of the Fonds de la Recherche Scientifique, FNRS, rue d'Egmont 5, B-1000 Bruxelles, Belgium
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Scuflaire, Richard ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)
Ventura, P.; Osservatorio Astronomico di Roma-INAF, via Frascati 33, Monteporzio Catone, Rome, Italy)
Language :
English
Title :
Inference from adiabatic analysis of solar-like oscillations in red giants
Baglin, A., Auvergne, M., Barge, P., (2002), B. Battrick, F. Favata, I.W. Roxburgh, D. Galadi (eds.), Stellar Structure and Habitable Planet Finding, ESA SP-485, p. 17
Barban, C., Matthews, J.M., De Ridder, J., (2007) A&A, 468, p. 1033
Bedding, T.R., Kjeldsen, H., (2010) Communications in Asteroseismology, 161, p. 3
Bedding, T.R., Huber, D., Stello, D., (2010) ApJ, 713, pp. L176
Borucki, W., Koch, D., Batalha, N., (2009), F. Pont, D.D. Sasselov, M.J. Holman (eds.), Transiting Planets, IAU Symp. 253, p. 289