Massive star evolution in close binaries:conditions for homogeneous chemical evolution

Understand

We investigate the impact of tidal interactions, before any mass transfer, on various properties of the stellar models.

• We study the conditions for obtaining homogeneous evolution triggered by tidal interactions, and for avoiding any Roche lobe overflow during the Main-Sequence phase.
• We consider the case of rotating stars computed with a strong coupling mediated by an interior magnetic field.
• In models without any tidal interaction (single stars and wide binaries), homogeneous evolution in solid body rotating models is obtained when two conditions are realized: the initial rotation must be high enough, the loss of angular momentum by stellar winds should be modest.