Galactic Sodium from AGB Stars [article]

Robert G. Izzard, Brad K. Gibson, Richard J. Stancliffe
2006 arXiv   pre-print
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
more » ... th the latest supernova yields in an attempt to resolve these problems ... and have created many more.
arXiv:astro-ph/0612390v1 fatcat:mrq5wdohcbbbnigepsbesarinu