At Paris Observatory, most of the teams working on stellar physics are found in LESIA, LERMA, GEPI, and LUTH. Each team has its own positioning, both topical and methodological.
LESIA’s activities focus on the physics of stellar interiors, from low-mass to massive stars, but also on stellar magnetic fields. From a methodological point of view, these teams implement theoretical and numerical developments and rely on observational techniques (asteroseismology, spectropolarimetry, high angular resolution).
At GEPI, galactic archaeology represents the core topic, with a very strong interface with stellar physics. This also includes the study of metal-poor stars, which is important for the analysis of the chemical evolution of our Galaxy. There is also very strong expertise in astrometry and spectroscopy, which provide access to stellar parameters that are essential for a large number of astrophysical communities.
At LERMA several topics related to stellar physics are tackled, including the calculation of collisional excitation rates (necessary for non-LTE modelling of stellar atmospheres), UV spectroscopy, experimental and theoretical studies of atomic ion spectra and opacities, solar and stellar abundances, characterisation of stellar parameters, microscopic diffusion in stars, modelling of stellar interiors, and magneto/hydro-dynamic simulations of stellar interiors as well as the radiative magnetohydrodynamical simulation of shocks in stellar accretion columns.
Finally, the stellar activities at LUTH concern the modelling and numerical simulation around accretion jets and disks as well as the theoretical study of radiative accelerations.
More details on these different teams can be found down here.