Identification of spectral lines temperature dependent

The formation of stellar lines depends on their atomic properties and formation temperature. Therefore, in the spectrum of a star with active regions (which are cooler than the surrounding photosphere), different lines appear than in the spectrum of a quiet star. The presence of these lines becomes a diagnostic of the stellar activity. Since the star rotates, the contribution of spots changes over time in phase with the rotation and therefore so does its spectrum.

The project involves selecting lines sensitive to temperature and using them to deduce the presence and properties of stellar spots. It can be tailored to the expected number of hours as both an internship or a thesis.

The scientific impact concerns not only the knowledge of stars and their activity but also the ability to correctly extract the properties of a planet orbiting an active star (such as low-mass stars or young stars).