收稿日期: 2016-03-15
网络出版日期: 2016-11-15
基金资助
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
Stellar orbital eccentricity and formation of thick disk of the Galaxy based on LAMOST
Received date: 2016-03-15
Online published: 2016-11-15
景英杰 , 杜翠花 . 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[J]. 中国科学院大学学报, 2016 , 33(6) : 736 -740 . DOI: 10.7523/j.issn.2095-6134.2016.06.003
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.
Key words： thick-disk formation; eccentricity; solar neighborhood
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