Helium enrichment and carbon-star production in metal-rich populations
We present new theoretical stellar evolutionary models of metal-rich asymptotic giant branch (AGB) stars. Stellar models are evolved with initial masses between 1 and 7M at Z = 0.007, and 1 and 8M at Z=0.014 (solar) and at Z=0.03.We evolve models with a canonical helium abundance and with helium-enriched compositions (Y = 0.30, 0.35, and 0.40) at Z = 0.014 and 0.03. The efficiency of third dredge-up and the mass range of carbon stars decreases with an increase in metallicity. We predict carbon...[Show more]
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|Source:||Monthly Notices of the Royal Astronomical Society|
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