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arXiv 1101.4432astro-ph.SR
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用斯巴鲁高色散摄谱仪研究极贫金属星。V.锌增强的贫金属星BS 16920-017

Spectroscopic Studies of Extremely Metal-Poor Stars with the Subaru High Dispersion Spectrograph. V. The Zn-Enhanced Metal-Poor Star BS 16920-017

Satoshi Honda, Wako Aoki, Timothy C. Beers, Masahide Takada-Hidai

摘要:

本文报道了我们以前研究的18颗贫金属星的Zn丰度,其金属丰度范围为-3.2 < [Fe/H] <-2.5。在此金属丰度范围内,大多数恒星的[Zn/Fe]值随[Fe/H]值的减小而增大,证实了前人的研究结果。然而,极贫金属恒星BS 16920-017([Fe/H] = -3.2)表现出显着高的[Zn/Fe]比([Zn/Fe] = +1.0)。将该天体的化学丰度与HD 4306(其大气参数与BS 16920-017相似)进行比较,清楚地表明该恒星缺乏α元素和中子捕获元素,同时Mn和Ni以及Zn的含量增加。与超新星爆炸的关联被提出来解释在极贫金属恒星中发现的高Zn丰度比是一种可能的解释,尽管需要进一步的研究来充分解释这个物体的丰度模式。

英文摘要:

We report Zn abundances for 18 very metal-poor stars studied in our previous work, covering the metallicity range -3.2 < [Fe/H] < -2.5. The [Zn/Fe] values of most stars show an increasing trend with decreasing [Fe/H] in this metallicity range, confirming the results found by previous studies. However, the extremely metal-poor star BS 16920-017 ([Fe/H] = -3.2) exhibits a significantly high [Zn/Fe] ratio ([Zn/Fe] = +1.0). Comparison of the chemical abundances of this object with HD 4306, which has similar atmospheric parameters to BS 16920-017, clearly demonstrates a deficiency of alpha elements and neutron-capture elements in this star, along with enhancements of Mn and Ni, as well as Zn. The association with a hypernova explosion that has been proposed to explain the high Zn abundance ratios found in extremely metal-poor stars is a possible explanation, although further studies are required to fully interpret the abundance pattern of this object.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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