Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-14
Astronomy and Astrophysics
Astrophysics
Poster given at the conference "Why Galaxies Care About AGB Stars", August 7-11 2006, University of Vienna, Austria; to appear
Scientific paper
Galactic chemical evolution models which include sodium from type II supernovae alone underestimate the abundance of sodium in the interstellar medium by a factor of two to three over about 3 dex in metallicity and predict a flat behaviour in the evolution of [Na/Fe] at super-solar metallicities. Conversely, recent observations of stars with [Fe/H]~+0.4 suggest that [Na/Fe] increases at high metallicity. We have combined stellar evolution models of asymptotic giant branch and Wolf-Rayet stars with the latest supernova yields in an attempt to resolve these problems ... and have created many more.
Gibson Brad K.
Izzard Robert G.
Stancliffe Richard J.
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