Mass segregation of embedded clusters in the Milky Way  

作　　者：Xin-Yue Er Zhi-Bo Jiang Yan-Ning Fu 

机构地区：[1]Purple Mountain Observatory, Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2013年第3期277-289,共13页天文和天体物理学研究（英文版）

基　　金：project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology;funded by the National Aeronautics and Space Administration and the National Science Foundation;supported by the National Natural Science Foundation of China(Grant Nos.10873037,10921063,10733030 and 10833001)

摘　　要：Embedded clusters are ideal laboratories for understanding the early phase of the dynamical evolution of clusters as well as massive star formation. An interesting observational phenomenon is that some of the embedded clusters show mass segregation, i.e., the most massive stars are preferentially found near the cluster center. We develop a new approach to describe mass segregation. Using this approach and the Two Micron All Sky Survey Point Source Catalog （2MASS PSC）, we analyze 18 embedded clusters in the Galaxy. We find that 11 of them are mass-segregated and that the others are not mass-segregated. No inversely mass-segregated cluster is found.Embedded clusters are ideal laboratories for understanding the early phase of the dynamical evolution of clusters as well as massive star formation. An interesting observational phenomenon is that some of the embedded clusters show mass segregation, i.e., the most massive stars are preferentially found near the cluster center. We develop a new approach to describe mass segregation. Using this approach and the Two Micron All Sky Survey Point Source Catalog （2MASS PSC）, we analyze 18 embedded clusters in the Galaxy. We find that 11 of them are mass-segregated and that the others are not mass-segregated. No inversely mass-segregated cluster is found.

关 键 词：open clusters and associations： general -- stars： formation -- methods：data analysis 

分 类 号：P154.1[天文地球—天文学]