Evolution of massive stars with mass loss and rotation

Rotation together with mass loss modifies all the outputs of stellar evolution: lifetimes, evolutionary tracks in the HR diagram, surface abundances, expected number of red supergiants, number ratios of WR/O and WN/WC stars, chemical yields, presupernova status, final stellar masses, nature of the remnants, rotation periods of pulsars, etc. At solar composition, the effects of mass loss dominate above an initial mass of 30 M⊙, while below the effects of rotational mixing dominate.Mixing is much larger at lower metallicity Z and there are interesting relations between the predicted enrichments at very low Z and the observed peculiar abundances in very metal poor halo stars.