Chemical Compositions of Four Metal‐poor Giant Stars
Chemical Compositions of Four Metal‐poor Giant Stars
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四颗贫金属巨星的化学成分
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
G. Pandey
中科院分区：
文献类型：
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作者：
S. Giridhar;D. Lambert;G. González;G. Pandey
我们给出了四颗K巨星（CS 22877 - 1、CS 22166 - 16、CS 22169 - 35和BS 16085 - 0050）的化学组成，它们的[Fe/H]在−2.4到−3.1之间。已知[Fe/H ]< -2.5的贫金属恒星在星星与星星之间的许多元素都有相当大的差异。这四个国家证实了这一结论。CS 22877 - 1和CS 22166 - 16富含碳。在我们的样品中，[α/Fe]有显著的分布，其中[α/Fe]是根据[Mg/Fe]和[Ca/Fe]比值的平均值计算的。BS 16085−0050显著富含α，平均[α/Fe]为+0.7，但CS 22169 - 35 α贫乏。铝丰度也显示出样品上的显著变化。描述了在高速晚型星中寻找贫金属星的平行和不成功的搜索。
We present the chemical compositions of four K giants (CS 22877‐1, CS 22166‐16, CS 22169‐35, and BS 16085−0050) that have [Fe/H] in the range −2.4 to −3.1. Metal‐poor stars with [Fe/H ]< -2.5 are known to exhibit considerable star‐to‐star variations of many elements. This quartet confirms this conclusion. CS 22877‐1 and CS 22166‐16 are carbon‐rich. There is significant spread of [α/Fe] within our samples, where [α/Fe] is computed from the mean of the [Mg/Fe] and [Ca/Fe] ratios. BS 16085−0050 is remarkably α‐enriched with a mean [α/Fe] of +0.7, but CS 22169‐35 is α‐poor. The aluminum abundance also shows a significant variation over the sample. A parallel and unsuccessful search among high‐velocity late‐type stars for metal‐poor stars is described.