Evelyne Alecian
Université Grenoble Alpes, France

Abstract
Magnetic field is one of the importantingredients at play during the formation of the stars from the collapse ofmolecular clouds down through the pre-main-sequence phase. Tremendousprogresses have been made to characterize the properties of magnetic fields inyoung stars, and pre-stellar objects, but also in modelling dynamo processes instellar interiors. Nonetheless, it is still not clear what are the origins ofstellar magnetic fields, and what roles play initial conditions. Magneticfields play also an important role in the accretion/ejection processes. However,many observational constraints on these flows remain mysterious. I will first reviewour current knowledge on the stellar magnetic properties at all mass and ages,focusing on the pre-main-sequence phase. I will then discuss our currentknowledge on the magnetospheric accretion/ejection processes in young stars,and what are their limits. I will then present the different hypothesis on theorigin of stellar magnetic fields, and how our new project, PROMETHEE will address the key questions regarding the origin of stellar magnetic fields.

2023 June 07, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto