| 在疏散星团M67中发现一颗高速星 |
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| 引用本文： | 高新华.在疏散星团M67中发现一颗高速星[J].科学通报,2014,59(4-5):319-322. |
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| 作者姓名： | 高新华 |
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| 作者单位： | 常州大学信息科学与工程学院, 常州 213164 |
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| 基金项目： | 常州大学校基金（ZMF1002121）资助 |
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| 摘 要： | 利用UCAC4星表（the fourth U.S. naval observatory CCD astrograph catalog）提供的高精度自行数据分析了疏散星团M67的运动学性质. 分析显示有1颗质量约0.8~0.9 MΘ；的小质量恒星以约30±；9 km/s的高速相对于星团运动. 这颗高速星距星团中心的投影距离约0.4 pc， 位于星团核心区. 其速度是星团核心区理论逃逸速度的16倍， 处于高速逃逸状态. 该星在颜色-星等图上的位置、空间投影位置以及视向速度表明它极有可能是M67的成员星. 在M67中发现高速星对理解星团内部动力学演化以及太阳系的起源都有重要意义.
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| 关 键 词： | 疏散星团 M67 恒星 颜色-星等图 自行 |
Discovery of a high-velocity star in the open cluster M67 |
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| GAO XinHua.Discovery of a high-velocity star in the open cluster M67[J].Chinese Science Bulletin,2014,59(4-5):319-322. |
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| Authors: | GAO XinHua |
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| Institution: | School of Information Science and Engineering, ChangZhou University, Changzhou 213164, China |
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| Abstract: | We report the discovery of a high-velocity star in the core of open cluster M67, located at a project distance of about 0.4 pc from the cluster center. The star has a tangential velocity of about 30±9 km/s relative to the cluster, corresponding to 16 times of the escape velocity in the core, which is only about 1.9 km/s. The high-velocity star is estimated to have a mass of 0.8-0.9 MΘ, and no evidence indicates that the star is in a binary system. The position in color-magnitude diagram, project distance from the cluster center and the radial velocity indicate that the star is very likely a member star of the cluster. |
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| Keywords: | open cluster M67 star color-magnitude diagram proper motion |
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