Séminaires

Internal rotation and magnetic fields of the intermediate-mass main-sequence star KIC 9244992
Masao Takata (The University of Tokyo, Tokyo (Todai))

Salle de réunion AGO (local -1/14), Institut d'Astrophysique et de Géophysique
Bâtiment B5c, Quartier Agora, Allée du 6 Août, 19C, B-4000 Liège 1 (Sart-Tilman)

Asteroseismology is the study of the structure and dynamics of stars based on their surface oscillations.  This field has advanced considerably in recent years due to the high-precision photometry provided by space missions such as CoRoT, Kepler and TESS, and this progress is set to continue with the upcoming PLATO mission.  This presentation focuses on the F-type main-sequence star KIC 9244992, which was observed by the Kepler space telescope for almost four years.  It is a pulsating variable star of the delta Sct and gamma Dor hybrid type, meaning its oscillation periods fall into two regimes: a few hours for acoustic modes and approximately one day for gravity modes.  The most notable aspect is the clean rotational multiplets evident in the Fourier spectrum of the light curve.  I will first summarise the results of its internal rotation and then introduce a recent result concerning its internal magnetic fields.

Genesis: the ESA mission to measure Earth down to the millimeter
Gilles Wautelet (LPAP, STAR Institute, ULiège)

Salle de réunion AGO (local -1/14), Institut d'Astrophysique et de Géophysique
Bâtiment B5c, Quartier Agora, Allée du 6 Août, 19C, B-4000 Liège 1 (Sart-Tilman)

TBD