Asteroseismology, the study of stellar oscillations to diagnose the structure and dynamics of stars, is one of the hottest subjects in stellar physics. This field has developed significantly in recent years thanks to the high-precision photometry provided by space missions such as CoRoT, Kepler and TESS. In this presentation, I examine an F-type main-sequence star, KIC 9244992, which was observed by the Kepler space telescope for almost four years. This star exhibits light variations on two different timescales : a few hours and a day. These imply that the star is a pulsating variable star of the delta Sct and gamma Dor hybrid type. Physically, the oscillation modes with shorter periods consist of acoustic waves, while those with longer periods consist of internal gravity waves. The most unusual aspect is that the Fourier spectrum of the light curve has a very simple, clean structure. This property makes the star a benchmark in asteroseismology, enabling us to perform robust analyses with little ambiguity. Having reviewed the results of its internal rotation, I will introduce the latest research on its magnetism.
Asteroseismology of the remarkable intermediate-mass main-sequence star KIC 9244992
Mardi 12 mai 2026
de
14:00 à
15:00
Conference room, building 17
