The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
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DOI：
10.3847/1538-4357/abf841
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发表时间：
2021-06
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通讯作者：
Q. Gao;Jian-rong Shi;Hong-liang Yan;Chun-qian Li;Tian-Yi Chen;Jing-Hua Zhang;Shuai Liu;T. Yan;Xiaomei Xie;M. Ding;Yong Zhang;Yong-Hui Hou
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文献类型：
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作者：
Q. Gao;Jian-rong Shi;Hong-liang Yan;Chun-qian Li;Tian-Yi Chen;Jing-Hua Zhang;Shuai Liu;T. Yan;Xiaomei Xie;M. Ding;Yong Zhang;Yong-Hui Hou
通过大天区多目标光纤光谱望远镜（LAMOST）中分辨率巡天（MRS）获取数百万颗恒星的光谱的目的之一是获得元素丰度，从而可以追踪感兴趣元素的起源和演化。锂是一种重要的元素，它表现出许多令人困惑的行为。调查锂丰度到一个独特的大样本的恒星是必不可少的，以了解它的起源和演化。在本文中，我们提出了锂丰度从LAMOST MRS光谱计算的模板匹配方法。我们的数据集由294，857个光谱组成，对应于165，479颗恒星，分辨率为Δλ/λ <$7500。我们比较了锂丰度从我们的工作与那些使用高分辨率光谱，发现了良好的一致性。讨论了锂丰度的误差。我们的结果表明，锂丰度的分布在+2.6和+1.0 dex处分别显示出两个明显的峰。这个样本对于研究恒星内部发生的改变表面锂丰度的物理机制具有潜在的重要性。
One of the purposes of taking spectra for millions of stars through the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS) is to obtain the elemental abundances, so that one can trace the origin and evolution for the element of interests. Lithium is one of such elements of great importance, which exhibits many puzzling behaviors. Investigating the lithium abundances to a uniquely large sample of stars is essential to understand its origin and evolution. In this paper, we present the lithium abundances obtained from the LAMOST MRS spectra calculated by the template-matching method. Our data set consists of 294,857 spectra that corresponds to 165,479 stars with a resolution power of Δλ/λ ∼ 7500. We compared the lithium abundances derived from our work with those using the high-resolution spectra and found a good consistence. The errors of lithium abundances are discussed. Our results suggest that the distribution of lithium abundances show two clear peaks at +2.6 and +1.0 dex, respectively. This sample is potentially important for investigating physical mechanisms occurring inside stars that alter the surface lithium abundance.