Carbon and Oxygen Galactic Gradients II: A Solution to the Carbon Enrichment Problem
Abstract
Eleven models of Galactic chemical evolution, differing on the carbon and oxygen yields adopted, have been computed to explain the observed Galactic carbon and oxygen radial gradients. All the models fit the oxygen gradient, but only two models fit also the carbon gradient, those based on carbon yields that increase with metallicity due to stellar winds in massive stars (MS) and decrease with metallicity due to stellar winds in low and intermediate mass stars (LIMS). The successful models also fit the O/H and C/O evolution history of the solar vicinity. We find that about half of the carbon in the solar vicinity has been produced by MS and half by LIMS.Keywords
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