The evolution of CNO abundances in galaxies

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Abstract
Results on the evolution of CNO abundances in the solar vicinity and in irregular and blue compact galaxies are presented. The chemical evolution models on which the findings are based, which take into account the most recent developements in stellar nucleosynthesis and theories on the origin of supernovae (SNe), particularly type I, are summarized. It is found that oxygen should be almost entirely produced by massive stars which eject it into the ISM through a type II SN explosion. Iron should be mostly produced by type I SNe having progenitors among low and intermediate mass stars. Type II SNE should contribute about 30 percent of the iron enrichment. Carbon and nitrogen should be mostly produced by low and intermediate mass stars.

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