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Paper: Galactic Sodium from AGB Stars
Volume: 378, Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes
Page: 121
Authors: Izzard, R.G.; Gibson, B.K.; Stancliffe, R.J.
Abstract: Galactic chemical evolution (GCE) models which include sodium from type II supernovae (SNe) alone underestimate the abundance of sodium in the interstellar medium by a factor of 2 to 3 over about 3 dex in metallicity and predict a flat behavior 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 (AGB) and Wolf-Rayet (WR) stars with the latest SN yields in an attempt to resolve these problems . . . and have created many more.
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