疏散星团M67成员星的两点相关分析
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作者单位:

1. 上海包玉刚实验学校 上海 201620;2. 上海市星系与宇宙学半解析研究重点实验室 上海 200234;3. 上海师范大学数理学院 上海 200234

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P154;

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上海市地方院校能力建设项目(20070502400)资助


Two-point Correlation Function of Member Stars in the Open Star Cluster M67
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Affiliation:

1. YK Pao School, Shanghai 201620;2. Shanghai Key Lab for Astrophysics, Shanghai 200234;3. Mathematics & Science College, Shanghai Normal University, Shanghai 200234;

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    摘要:

    对著名老年疏散星团M67的成员星进行了两点相关函数分析, 讨论了团星的空间分布情况及质量分层现象. 结果表明: M67成员星的两点相关函数能很好地用幂律形式来描述, 其成员星在空间分布上具有显著的成团性和自相似性. 对M67不同光度成员星两点自相关函数的分析表明, 亮星相比暗星具有更强的相关强度和更大的相关指数, 说明在星团内部出现了明显的空间质量分层现象, 亮星比暗星具有更强的成团性和更大的中心聚度. 不同光度成员星间两点交叉相关函数的分析进一步表明, 不同光度成员星之间并没有表现出绝对的空间质量分层现象, 亮星和暗星在空间分布上相互交织、相互渗透.

    Abstract:

    In this paper, we study the two-point correlation function of the old open cluster M67. We discuss the spatial distribution and mass segregation of M67 member stars. The result suggests that spatial distribution of all member stars can be well described by power law. This implies that M67 is characterized by significant spatial clustering and self-similarity. The result of two-point self-correlation function analysis shows that brighter member stars tend to have greater correlation strength and larger correlation index. This indicates that the spatial mass segregation in M67 exists and brighter stars have larger spatial concentration. Further cross-correlation analysis reveals that there is no absolute mass segregation for M67 member stars and all of stars mingle with each other in spatial distribution.

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郭文瀚,罗智坚,束成钢.疏散星团M67成员星的两点相关分析[J].天文学报,2021,62(3):30. GUO Wen-han, LUO Zhi-jian, SHU Cheng-gang. Two-point Correlation Function of Member Stars in the Open Star Cluster M67[J]. Acta Astronomica Sinica,2021,62(3):30.

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  • 收稿日期:2020-10-23
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  • 在线发布日期: 2021-06-07
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