Pre-supernova models at very low metallicity

R. Hirschi

University of Basel, CH

A series of fast rotating models at very low metallicity (Z=1e-8) was computed in order to explain the surface abundances observed at the surface of CEMP stars, in particular for nitrogen. The main results are the following:

- Strong mixing occurs during He-burning and leads to important primary nitrogen production.

- Important mass loss takes place in the RSG stage for the most massive models. The 85 solar mass model loses about three quarter of its initial mass, becomes a WO star and could produce a GRB.

- The CNO elements of HE1327-2326 could have been produced in massive rotating stars and ejected by their stellar winds.

Reference: Nuclei in the Cosmos IX
Status: Conference proceedings


Comments: 5 pages, 3 figures