Abstract

Discuss open issues in modeling of stars due to discrepancies between theory and observations, What physics is missing to describe their structure (convection, rotation, magnetic fields, etc.), evolution (from genesis to end of life), interaction with their environment (winds out and in, outbursts, magnetic fields, etc.), and membership of ensembles (from binaries to galaxies). What are the most recent achievements in space observations and theory? Develop a strategy for the future.