A large sample of metallic-line star candidates from LAMOST Data Release 1

A large sample of metallic-line star candidates from LAMOST Data Release 1
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LAMOST 数据发布 1 中的大量金属线恒星候选者样本

DOI:
10.1093/mnras/stv176
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发表时间:
2015-01
影响因子:
4.8
通讯作者:
Liu Xiaowei
Liu Xiaowei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bai Zhaongrui;Zhang Yong;Hou Yonghui;Liu Xiaowei

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我们提出了一个样本的金属线星星(Am)的候选人从大天区多目标ber光谱望远镜数据发布1(LAMOST DR 1)。根据Am星钙元素丰度不足而铁元素丰度过高的特点,提出了一种由低分辨光谱中Ca Ⅱ K线和铁线的线指数导出的经验分离曲线。3537 Am候选星是从30,000多颗经LAMOST管道和目视检查分类为A{型或早期{F}星中选出的。然后我们对这个样本进行了一些分析,并最终提供了这些Am候选人的10个相关参数的列表。与其它星表相比,从LAMOST DR 1中选出的Am候选星总体上要暗淡得多。显然,我们的列表是对已知的明亮Am星表的重要补充,它为研究这类化学奇特的恒星提供了宝贵的材料。
We present a sample of metallic-line star (Am) candidates from the Large sky Area Multi-Object ber Spectroscopic Telescope Data Release one (LAMOST DR1). According to the characteristic of under-abundance of calcium and overabundance of iron element of Am stars, we propose an empirical separation curve derived from line indices of Ca II K{line and iron lines we choose for low resolution spectra. 3537 Am candidates are ultimately selected from more than 30,000 stars which are classied as A{type or early{F stars by both LAMOST pipeline and visual inspection. Then we make some analysis on this sample and nally provide a list of these Am candidates with 10 relevant parameters. Comparing with other catalogues, Am candidates selected from LAMOST DR1 are much fainter on the whole. Obviously, our list is an important complementary to already known bright Am catalogues, and it oers valuable material for the research on this type of chemically peculiar stars.
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