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Stellar yields from rotating stellar models: Their effect on chemical evolution model predictions

In this work we evaluate the impact of the new stellar yields recently computed by Meynet & Maeder (2002), where stellar rotation is taken into account, on important open questions related to the C, N and He enrichment in galaxies. Moreover, we show that some abundance ratios offer an important tool to investigate the halo-disk discontinuity. It is shown that the effect of a halt in the star formation between the halo/thick disk and thin disk phases, already suggested from studies based both on Fe/O and Fe/Mg, should also be seen in a C/O versus O/H plot if C is produced mainly by lowand intermediate-mass stars (LIMS). Recent C/O measurements for stars in the MW halo and disk seem to confirm the above prediction. Finally, a more gentle increase of N abundance with metallicity (or time) is predicted when adopting the stellar yields with rotation of Meynet & Maeder (2002), which do not include hot-bottom burning, than when adopting the yields of van den Hoek & Groenewegen (1997), for intermediate mass stars. This fact has some implications for the timescales for the N enrichment and thus for the interpretation of the nature of damped lyman alpha systems (DLAs).