Searching for r-process-enhanced stars in the LAMOST survey I: the method
Searching for r-process-enhanced stars in the LAMOST survey I: the method
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DOI：
10.1088/1674-4527/21/2/36
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发表时间：
2021-03-01
影响因子：
1.8
通讯作者：
Zhao, Gang
中科院分区：
文献类型：
--
作者：
Chen, Tian-Yi;Shi, Jian-Rong;Zhao, Gang
r过程增强恒星的丰度模式包含了限制r过程核合成的天体物理位置所需的关键信息，并加深了我们对银河系化学演化的理解。为了扩大已知R -过程增强恒星的样本，我们开发了一种方法，通过将观测到的光谱与6645.1埃Eu ii线周围的合成模板进行匹配，在LAMOST中分辨率（R类似于7500）光谱调查中寻找候选恒星。我们从12 209颗独特的恒星中获得了13颗金属贫（-2.35 < [Fe/H] < -0.91）候选样本，具有32 774个中分辨率光谱。这些候选者将在不久的将来通过高分辨率的后续观测进一步研究。我们描述了这一努力的一些扩展，以包括更大的恒星样本，特别是在金属丰度较低的情况下，使用Ba ii线在6496.9埃的强度。
The abundance patterns of r-process-enhanced stars contain key information required to constrain the astrophysical site(s) of r-process nucleosynthesis, and to deepen our understanding of the chemical evolution of our Galaxy. To expand the sample of known r-process-enhanced stars, we have developed a method to search for candidates in the LAMOST medium-resolution (R similar to 7500) spectroscopic survey by matching the observed spectra to synthetic templates around the Eu ii line at 6645.1 angstrom. We obtain a sample of 13 metal-poor (-2.35 < [Fe/H] < -0.91) candidates from 12 209 unique stars with 32 774 mediumresolution spectra. These candidates will be further studied by high-resolution follow-up observations in the near future. We describe some extensions of this effort to include larger samples of stars, in particular at lower metallicity, using the strength of the Ba ii line at 6496.9 angstrom.