Galactic sodium from AGB stars

被引：0
|
作者：
Izzard, Robert G. [1 ]
Gibson, Brad K. [2 ]
Stancliffe, Richard J. [3 ]
机构：
[1] Univ Utrecht, Sterrekundig Inst, NL-3508 TC Utrecht, Netherlands
[2] Univ Cent Lancashire, Preston PR1 2HE, Lancs, England
[3] Univ Cambridge, Inst Astron, Cambridge CB2 1TN, England
来源：
WHY GALAXIES CARE ABOUT AGB STARS: THEIR IMPORTANCE AS ACTORS AND PROBES | 2007年 / 378卷
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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] similar to +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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页码：121 / +
页数：2
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