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Intrinsic photometric characterisation of stellar oscillations and granulation Solar reference values and CoRoT response functions

TitreIntrinsic photometric characterisation of stellar oscillations and granulation Solar reference values and CoRoT response functions
Type de publicationJournal Article
Year of Publication2009
AuteursMichel, E, Samadi, R, Baudin, F, Barban, C, Appourchaux, T, Auvergne, M
JournalAstronomy & Astrophysics
Volume495
Pagination979-987
Date PublishedMar
ISBN Number0004-6361
Numéro d'accèsWOS:000263969500026
Résumé

Context. Measuring amplitudes of solar-like oscillations and the granulation power spectral density constitute two promising sources of information to improve our understanding and description of the convection in outer layers of stars. However, different instruments, using different techniques and different bandpasses, give measurements that cannot be directly compared to each other or to theoretical values. Aims. In this work, we define simple response functions to derive intrinsic oscillation amplitudes and granulation power densities, from photometry measurements obtained with a specific instrument on a specific star. Methods. We test this method on different photometry data sets obtained on the Sun with two different instruments in three different bandpasses. Results. We show that the results are in good agreement and we establish reference intrinsic values for the Sun with photometry. We also compute the response functions of the CoRoT instrument for a range of parameters representative of the Main Sequence solar-like pulsators to be observed with CoRoT. We show that these response functions can be conveniently described by simple analytic functions of the effective temperature of the target star.

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