Galactic Sodium from AGB Stars
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0612390,
title = {Galactic Sodium from AGB Stars},
author = {Robert G. Izzard and Brad K. Gibson and Richard J. Stancliffe},
journal= {arXiv preprint arXiv:astro-ph/0612390},
year = {2007}
}
Comments
Poster given at the conference "Why Galaxies Care About AGB Stars", August 7-11 2006, University of Vienna, Austria; to appear in the proceedings (ASP Conference Series). Winner of best poster prize!