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Abundances of Na, Mg and Al in nearby metal-poor stars
Gehren, T; Liang, YC; Shi, JR; Zhang, HW; Zhao, G
AbstractTo determine the population membership of nearby stars we explore abundance results obtained for the light neutron-rich elements (23)Na and (27)Al in a small sample of moderately metal-poor stars. Spectroscopic observations are limited to the solar neighbourhood so that gravities can be determined from HIPPARCOS parallaxes, and the results are confronted with those for a separate sample of more metal-poor typical halo stars. Following earlier investigations, the abundances of Na, Mg and Al have been derived from NLTE statistical equilibrium calculations used as input to line profile synthesis. Compared with LTE the abundances require systematic corrections, with typical values of + 0.05 for [Mg/Fe], -0.1 for [Na/Fe] and + 0.2 for [Al /Fe] in thick disk stars where [Fe/H] similar to - 0.6. In more metal-poor halo stars these values reach + 0.1, - 0.4, and + 0.5, respectively, differences that can no longer be ignored.
KeywordLine : Formation Line : Profiles Stars : Fundamental Parameters Stars : Abundances Stars : Late-type
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WOS IDWOS:000187887900029
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Document Type期刊论文
Affiliation1.Univ Munich, Inst Astron & Astrophys, D-81679 Munich, Germany
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Gehren, T,Liang, YC,Shi, JR,et al. Abundances of Na, Mg and Al in nearby metal-poor stars[J]. ASTRONOMY & ASTROPHYSICS,2004,413(3):1045-1063.
APA Gehren, T,Liang, YC,Shi, JR,Zhang, HW,&Zhao, G.(2004).Abundances of Na, Mg and Al in nearby metal-poor stars.ASTRONOMY & ASTROPHYSICS,413(3),1045-1063.
MLA Gehren, T,et al."Abundances of Na, Mg and Al in nearby metal-poor stars".ASTRONOMY & ASTROPHYSICS 413.3(2004):1045-1063.
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