Massive Stars and Their Role in Spectra and Abundances of High Redshift Galaxies

Abstract.

There are great changes in our understanding of massive star evolution. Although it is a known fact that the populations of massive stars (O-stars, WR stars, blue and red supergiants) are very different in galaxies of different metallicities, the major role of axial rotation was not yet fully realised. Rotation dramatically influences all model outputs. Moreover, recent observations suggest raster rotation at lower metallicities, a result which may thus be particularly critical for the interpretation of the spectra and chemical abundances of high redshift galaxies.