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Sodium abundances in nearby disk stars
Shi, JR; Gehren, T; Zhao, G
2004-08-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号423期号:2页码:683-691
摘要We present sodium abundances for a sample of nearby stars. All results have been derived from NLTE statistical equilibrium calculations. The influence of collisional interactions with electrons and hydrogen atoms is evaluated by comparison of the solar spectrum with very precise fits to the Na I line cores. The NLTE effects are more pronounced in metal-poor stars since the statistical equilibrium is dominated by collisions of which at least the electronic component is substantially reduced. The resulting influence on the determination of sodium abundances is in a direction opposite to that found previously for Mg and Al. The NLTE corrections are about -0.1 in thick-disk stars with [Fe/H] similar to -0.6. Our [Na/Fe] abundance ratios are about solar for thick- and thin-disk stars. The increase in [Na/Fe] as a function of [Fe/H] for metal-rich stars found by Edvardsson et a]. (1993) is confirmed. Our results suggest that sodium yields increase with the metallicity, and quite large amounts of sodium may be produced by AGB stars. We find that [Na/Fe] ratios, together with either [Mg/Fe] ratio, kinematic data or stellar evolutionary ages, make possible the individual discrimination between thin- and thick-disk membership.
关键词Line : Formation Line : Profiles Stars : Abundances Stars : Late-type Galaxy : Evolution
DOI10.1051/0004-6361:20040203
收录类别SCI
语种英语
WOS记录号WOS:000223621400034
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8118
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Munich, Inst Astron & Astrophys, D-81679 Munich, Germany
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Shi, JR,Gehren, T,Zhao, G. Sodium abundances in nearby disk stars[J]. ASTRONOMY & ASTROPHYSICS,2004,423(2):683-691.
APA Shi, JR,Gehren, T,&Zhao, G.(2004).Sodium abundances in nearby disk stars.ASTRONOMY & ASTROPHYSICS,423(2),683-691.
MLA Shi, JR,et al."Sodium abundances in nearby disk stars".ASTRONOMY & ASTROPHYSICS 423.2(2004):683-691.
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