Kinematics and geometrical study of the Be stars 48 Persei and<i>ψ</i>Persei with the VEGA/CHARA interferometer

Abstract

Context. Five different physical processes might be responsible for the formation of decretion disks around Be stars: fast rotation of the star, stellar pulsations, binarity, stellar winds, and magnetic fields. Our observations indicate that fast rotation seems to produce a disk in Keplerian rotation, at least in the specific case of the two stars observed. We do not know if this observational result is a generality or not.