基于巡天数据的移动星群研究

移动星群(Moving Group)是指运动学性质相似的恒星的集合。它们可能起源于已经瓦解的星团或者银河系吸积并合矮星系的残骸，也可能是银河系中心棒或者漩涡结构动态产生的。寻找更多的移动星群和分析它们的特征对理解银河系的形成、结构和演化具有重要的意义。该项目主要利用LAMOST、RAVE和SEGUE提供的海量恒星光谱数据得到的视向速度和大气参数，再结合其它的测光和自行星表，计算大样本恒星的六维相空间（X,Y,Z,U,V,W），进行移动星群的探测。通过对已知的移动星群的成员星的金属丰度、色球活动分析，来确定他们的形成机制，从而加深我们对银河系的结构、形成和演化的理解。

Moving groups are stars that share the same velocity components. Some originate from dissociated clusters; some are formed trough dynamic interactions and some are the relics of satellite galaxies. Moving groups are very important for us to understand the formation and evolution of Milky way. This project will construct six dimension phase space (X,Y,Z,U,V,W) for a large sample for moving groups detection. For known moving groups, metallicity and chromospheric activiy will be analyzed for them to better understand their origin.