Constraints on the nucleosynthesis of Cu and Zn from models of chemical evolution of the Galaxy

The observed abundances of Cu and Zn in stars of different metallicities are compared with chemical evolution models for the Galaxy adopting current stellar nucleosynthesis results. Cu and Zn are both produced by s-processing in massive stars (weak component) and by s-processing in low mass stars (main component) as well as by explosive nucleosynthesis in supernovae. The most important contributions to Cu and Zn are those from supernovae and the weak component, while the contribution from the main component is negligible. The stellar yields for the weak component are now fairly well established, whereas those for the explosive nucleosynthesis are still affected by large uncertainties