| 中等贫金属星高分辨率光谱分析Ⅱ.化学元素丰度 |
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| 引用本文： | 邱红梅,赵刚,仲佳勇.中等贫金属星高分辨率光谱分析Ⅱ.化学元素丰度[J].天文学报,2002,43(3):257-263. |
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| 作者姓名： | 邱红梅 赵刚 仲佳勇 |
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| 作者单位： | 中国科学院国家天文台,北京,100012 |
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| 基金项目： | 国家自然科学基金(No.19725312)，国家重点基础研究专项经费资助 |
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| 摘 要： | 在第1篇论文的基础上，确定了样本星的恒星大气参数，得到这些星中9种元素的丰度。讨论了各种元素丰度随Fe/H]的变化。平均的Na/Fe]～－0．01dex，接近于太阳丰度。α元素Si和Ca具有几乎相同的丰度模式，而Ti/Fe]弥散较大，但三者均有随Fe/H]的减小而增加的趋势。铁峰元素V、Cr、Ni在不同丰度处有较大的弥散，Cr/Fe]在所有样本星中均表现超丰；而Mn/Fe]却明显过贫，且随金属丰度的增加而增加。
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| 关 键 词： | 中等贫金属星 高分辨率光谱分析 化学元素 丰度 恒星 大气 HD22484 HD51530 HD59984 |
| 修稿时间： | 2001年8月20日 |
High-Resolution Spectral Analysis of the Mildly Metal-Poor Stars Ⅱ. Chemical abundances |
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| QIU Hong-Mei ZHAO Gang ZHONG Jia-Yong.High-Resolution Spectral Analysis of the Mildly Metal-Poor Stars Ⅱ. Chemical abundances[J].Acta Astronomica Sinica,2002,43(3):257-263. |
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| Authors: | QIU Hong-Mei ZHAO Gang ZHONG Jia-Yong |
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| Abstract: | Based on the first paper, here the model parameters of a set of sample stars and the chemical abundances for nine elements are presented. The relations between the elemental abundances and Fe/H] are also discussed. On average, Na/Fe] tends to -0.01dex and shows solar pattern. The a elements, Si and Ca, show the same abundance patterns, while Ti/Fe] has a large scatter. The abundances of these three elements all decrease with Fe/H] increasing. The iron-peak elements V, Cr, Ni show a large scatter at different metallicity, and Ca/Fe] is overabundant in all the sample stars, while Mn/Fe] is definitely underabundant and increases with the metallicity increasing. |
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| Keywords: | stars: abundances stars: atmospheres stars: individual: HD22484 HD51530 HD59984 |
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