Element Abundance Analysis of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Element Abundance Analysis of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
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DOI：
10.3847/1538-4357/abff52
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发表时间：
2021-05
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影响因子：
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通讯作者：
Haifan Zhu;C. Du;Yepeng Yan;Jian-rong Shi;Jun Ma;H. Newberg
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作者：
Haifan Zhu;C. Du;Yepeng Yan;Jian-rong Shi;Jun Ma;H. Newberg
基于第二次GAIA数据发布(DR2)和远地点(DR16)光谱测量，我们定义了两种恒星样本：vϕ和Gt的高速厚盘、90 KM的S−1和vϕ和lt的富金属星晕90 KM的S−1。这些元素的丰度构成了一个多维数据空间，我们介绍了一种处理多维数据的算法方法，给出了降维聚类的结果。根据化学性质分析，我们得出一些HVTD星可能起源于薄盘，一些MRSH星可能起源于矮星系，但两个样本中具有相似化学丰度特征的恒星可能是原地形成的。
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, we define two kinds of star samples: high-velocity thick disk (HVTD) with v ϕ > 90 km s−1 and metal-rich stellar halo (MRSH) with v ϕ < 90 km s−1. Due to high-resolution spectra data from APOGEE (DR16), we can accurately analyze the element abundance distribution of HVTD and MRSH. These element abundances constitute a multidimensional data space, and we introduce an algorithm method for processing multidimensional data to give the result of dimensionality reduction clustering. According to chemical property analysis, we derive that some HVTD stars could originate from the thin disk and some MRSH stars could originate from dwarf galaxies, but those stars that have similar chemical abundance characteristics in both samples may form in situ.