搜寻球状星团M22中的高速星

发布时间：2018-03-05 00:09

本文选题：球状星团　切入点：M　出处：《中国科学:物理学力学天文学》2015年03期 　论文类型：期刊论文

【摘要】：高速星是研究球状星团内部恒星动力学过程的重要工具,但目前为止已发现的高速星数量很少,本研究利用高精度自行和测光数据尝试在球状星团M22中搜寻高速星.分析结果表明,M22可能存在90颗高速星,它们相对于星团的切向速度为43 84 km/s,平均误差约12 km/s.计算表明,M22中心的理论逃逸速度约31 km/s,小于高速星的空间速度,这些高速星可能都处于非引力束缚状态.分析还表明,这些高速星可能是在最近的1 Ma内得到加速,并将于1 Ma内逃出星团的潮汐半径成为场星.最后讨论了这些高速星可能的起源.
[Abstract]:High-speed stars are important tools for studying the dynamics of stars in globular clusters, but the number of high-speed stars found so far is very small. In this study, we try to search for high speed stars in globular cluster M22 by using high precision geodesic and photometric data. The analysis results show that there may be 90 high speed stars in M22. Their tangential velocity relative to the cluster is 43 ~ 84 km / s, and the average error is about 12 km / s. The calculated results show that the theoretical escape velocity at the center of M 22 is about 31 km / s, which is smaller than the space velocity of the high speed star. These high speed stars may be in a nongravitational bound state. These high speed stars may be accelerated within the last 1 Ma and become field stars in the tidal radius of the star cluster escaping from the cluster within 1 Ma. Finally, the possible origin of these high speed stars is discussed.
【作者单位】：常州大学信息科学与工程学院;
【基金】：国家自然科学基金(批准号:11403004) 常州大学校基金(编号:ZMF1002121)资助项目
【分类号】：P154.12

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