Study of granulation in red giants observed by CoRoT using a new method for seismic indices extraction
1 : LESIA, Observatoire de Paris, UMR CNRS 8109, associée aux Universités Paris 6 Pierre et Marie Curie et Paris 7 Denis Diderot.
(LESIA)
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Website
Observatoire de Paris
LESIA, Observatoire de Paris 92195 Meudon -
France
2 : Laboratoire d'études spatiales et d'instrumentation en astrophysique
(LESIA)
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Website
* : Corresponding author
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
In the framework of the data base project SSI (Stellar Seismic Indices), we have developed and tested a new method aiming at optimizing the simultaneous measurement of both the seismic indices characterizing the oscillations (delta_nu, nu_max) and the index characterizing the granulation signature.
Here, we describe this method which is intended to take advantage of the MLE (maximum likelihood estimate) algorithm combined with the parametrized representation of the red giants pulsation spectrum following the Universal Pattern (Mosser et al. 2011). We report on its performances.
Finally, we discuss the results obtained for the granulation on a large set of CoRoT red giants stars.
| Subject : | : | poster |
| Topics | : | Session 1 - Probing stellar structure and evolution with asteroseismology |
| PDF version | : |  PDF version |
