CoRoT Symposium 3, Kepler KASC-7 joint meeting
6-11 Jul 2014 Toulouse (France)

Abstracts > Vrard Mathieu

Red giant oscillation spectra in control
Mathieu Vrard  1@  , Benoît Mosser  1@  , Caroline Barban  1@  
1 : Laboratoire d'études spatiales et d'instrumentation en astrophysique  (LESIA)  -  Website
Université Pierre et Marie Curie [UPMC] - Paris VI, Observatoire de Paris, INSU, CNRS : UMR8109, Université Paris VII - Paris Diderot, Université Pierre et Marie Curie (UPMC) - Paris VI
5, place Jules Janssen 92190 MEUDON -  France

CoRoT and Kepler allow us to decipher the finest details of the red giant interior structure. The frequency differences between consecutive radial modes provide the measurement of the mean stellar density; we now measure the modulation of the radial mode oscillation pattern and attribute these features to sharp structure variations inside these stars, related to the second ionisation of helium. The period spacings between consecutive dipole mixed modes provide the measurement of the core size; we now automatically measure the period spacing of gravity modes. This provides the most precise information on the evolutionary status of 12k stars and allows us to perform the automated measurement of rotational splittings. The methods will be briefly presented; the poster presented will focus on the results in terms of stellar evolution.

Online user: 1