A study of the effect of rotational mixing on massive stars evolution: surface abundances of Galactic O7-8 giant stars

Understand

Massive star evolution remains only partly constrained.

• In particular, the exact role of rotation has been questioned by puzzling properties of OB stars in the Magellanic Clouds.
• Our goal is to study the relation between surface chemical composition and rotational velocity, and to test predictions of evolutionary models including rotation.
• We have performed a spectroscopic analysis of a sample of fifteen Galactic O7-8 giant stars.