| 基于LAMOST对银河系厚盘恒星轨道偏心率及厚盘形成机制的研究 |
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| 作者姓名： | 景英杰 杜翠花 |
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| 作者单位： | 中国科学院大学物理科学学院, 北京 101408 |
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| 基金项目： | 国家自然科学基金委员会-中国科学院天文联合基金（U1231113）和中国科学院大学院所合作基金资助 |
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| 摘 要： | 基于LAMOST光谱数据，选取一个太阳邻域F/G型主序星样本研究银河系厚盘恒星的轨道偏心率分布.厚盘星是基于空间位置和金属丰度Fe/H]来证认，同时分析薄盘星的污染带来的影响.发现厚盘恒星轨道偏心率分布在低偏心率（约为0.2）处有一个峰值，而且向高偏心率延伸一个尾巴（到e~0.8）.把得到的厚盘恒星偏心率分布与4个厚盘形成模型进行对比，发现此结果与富气体并合模型最为符合.
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| 关 键 词： | 厚盘形成 偏心率 太阳邻域 |
| 收稿时间： | 2016-03-15 |
Stellar orbital eccentricity and formation of thick disk of the Galaxy based on LAMOST |
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| Authors: | JING Yingjie DU Cuihua |
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| Institution: | School of Physics Sciences, University of Chinese Academy of Sciences, Beijing 101408, China |
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| Abstract: | Based on LAMOST data,we use F/G main-sequence star sample to study the orbital eccentricity distri bution of the thick-disk stars in the Galaxy. The thick-disk stars are identified by spatial position and metallicity, and the contamination from the thin-disk stars is considered. We find that the observed thick-disk stellar orbital eccentricity distribution has a peak at low eccentricity (~0.2) and it extends to high eccentricity (e~0.8). We compare our results with the four thick-disk formation models, and our results are in the best agreement with the gas-rich merger model. |
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| Keywords: | thick-disk formation eccentricity solar neighborhood |
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