人马座星流研究进展  

Research Progress of Sagittarius Stream

作　　者：孙建楠 李静 罗志全 SUN Jiannan;LI Jing;LUO Zhiquan(College of Physics and Space Science,China West Normal University,Nanchong Sichuan 637009,China)

机构地区：[1]西华师范大学物理与空间科学学院

出　　处：《西华师范大学学报（自然科学版）》2019年第4期382-388,共7页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金项目(U1331121)

摘　　要：人马座星流是探索星系天文学问题的一个重要工具,对于银晕的研究具有重要意义。我们采用文献调查法对人马座星流的研究现状做了调查,总结了人马座星流的研究历史和基本结构,还找出了人马座星流早期研究情况的简图。其次,总结了人马座星流核心的天空位置、金属丰度、速度等参数,总结了人马座星流的导臂和曳臂与早期研究中天空位置的对比,从而给出了更准确的天空位置,还给出了星流导臂和曳臂与核心金属丰度的对比,从而得出核心与导臂和曳臂的一些参数是不同的结论。我们还总结整理了人马座星流的三维速度分布情况。关于化学演化的部分,文章中总结了α元素的分布情况。As the most prominent and widely studied stream in the Milky Way,Sagittarius stream has been proved to be an important tool for exploring galactic astronomy.It is of great significance for the study of Galactic halo.Firstly,the method of literature investigation is employed to investigate the current research situation of Sagittarius stream,summarize its research history and basic structure,and find out the sketch of the early research situation.Secondly,the paper summarizes the position,metallicity,velocity and other parameters of the core of Sagittarius stream and compares the leading arm and the trailing arm of Sagittarius stream and the position in the early research.A more accurate position and a comparison of metal abundance between the leading arm and the trailing arm and the core are also given.It is concluded that some parameters of the core and the leading arm and the trailing arm are different.In addition,the distribution of the three-dimensional velocity of Sagittarius stream is summarized.In the part of chemical evolution,the distribution of alpha elements is summarized.

关 键 词：运动学 金属丰度 人马座星流 视向速度 

分 类 号：P145.9[天文地球—天体物理]