Uncertaities due to convection and production of s-nuclei in massive stars

Abstract

We have investigated the role of the convective overshooting on the production of s-nuclei during core He-burning phase in stellar models with different initial mass and metallicity ($15\le M_{ZAMS}/M_{\odot }\le 25$; $10^{-4}\le Z\le 0.02$), considering a diffusive approach to model the convective overshooting. The results and their possible consequences on some open questions linked to the s-process weak component efficiency are discussed.

4 pages, no figures, Proceedings of the "54° congresso della Societa' Astronomica Italiana", Napoli, May 4-7, 2010, to appear in Mem. S.A.It. Suppl