Determining precise star ages is essential for insights into stellar, exoplanetary, and galactic evolution, but it remains a complex challenge. The two most precise techniques are (1) asteroseismology, which is the study of the internal structure of stars by means of intrinsic global oscillations, and (2) analysis of stellar clusters where stars are formed from the same molecular cloud at the same time, and the observed colour-magnitude diagram is a strong diagnostic of the cluster age. In this talk, I will combine these two techniques to determine the age of intermediate age open cluster NGC 2477. We used astrometry and colour from Gaia to extract membership probabilities and colour information about the stars in clusters, while pulsating stars were found using TESS data. Observations are complemented with asteroseismic modelling using MESA and GYRE to obtain the precise age of the cluster. In the second part of the talk, I will detail my contribution to the development of the ground segment of the ESA M3 PLATO mission to obtain stellar mass, radius, and age as well as several rotation and magnetic activity indicators for which CEA is responsible. I will conclude by showcasing some applications of the PLATO pipeline using Kepler and TESS data.
Local contact: Thierry FOGLIZZO
Organization: Frédéric GALLIANO
