基于LAMOST数据Mg超丰恒星的搜寻及研究

The main purpose of this project is to determine the Mg abundance for a large sample of LAMOST stellar spectra, and searching for strongly Mg-enhanced stars. The abundance analysis of strongly Mg-enhanced candidates based on high resolution spectra, stellar parameters and kinematics information will be a good probe for understanding the birth and formation mechanism of these peculiar stars. It could also help us to explore the special process of Galaxy formation and evolution. It is more efficient method for searching strongly Mg-enhanced stars that Mg Ib lines instead of a slice of the spectrum are used to determine the Mg abundance. So far, a systematic study of this kind of peculiar stars has not been formed. Therefore, more sample of strongly Mg-enhanced stars will be found through this project and a systematic study of these samples could help us to understand the birth and formation mechanism of these peculiar stars.

本项研究课题主要是利用大样本的LAMOST光谱数据确定样本的Mg丰度,并搜寻Mg超丰恒星。通过对Mg超丰样本的后续高分辨率光谱观测及详细的丰度分析工作，结合Mg超丰恒星的大气参数、运动学信息和化学元素丰度等信息，探究该类特殊天体的起源及其形成机制，揭示银河系形成与演化中的一些特殊过程，完善我们对星系形成与演化的理解。本项目的研究特点是：我们将使用Mg Ib特征谱线来确定Mg丰度。区别于目前已有的利用一段光谱确定α元素丰度的方法，我们的方法旨在确定样本的Mg丰度，并筛选出Mg超丰的恒星。因此，本项目在搜寻该类特殊天体上更有针对性，更有效。迄今为止，针对该类特殊天体还没有系统的研究工作。因此，本项目的研究结果可以极大地增加该类特殊天体的数目，系统的研究结果可以揭示该类特殊天体的起源及形成机制。