| Velocity Distance of the Open Cluster M11 |
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| 作者姓名： | Jun-Liang Zhao Li Chen |
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| 作者单位： | Jun-Liang Zhao and Li Chen Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | On the reasonable hypothesis that the internal motions of member stars of a cluster are random and isotropic, a method which can be used to estimate the velocity distance of the cluster and its uncertainty is developed. The velocity distance so determined is an absolute distance estimate, and is completely independent of the (widely used) luminosity distance, which is a relative distance estimate. Using the published high-accuracy observational data of radial velocities and proper motions of the stars in the open cluster M11 region, we have determined the distance of M11 to be 1.89 ± 0.52kpc. This is in quite good agreement with the published luminosity distances of the cluster. We briefly discuss the problems concerned, including the sources of errors in the method and its applicable range.
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| 关 键 词： | open cluster—radial velocity—proper motion —luminosity distance—velocity distance |
| 修稿时间： | 2006-11-10 |
Velocity Distance of the Open Cluster M11 |
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| Jun-Liang Zhao Li Chen.Velocity Distance of the Open Cluster M11[J].Chinese Journal of Astronomy and Astrophysics,2007,7(4):572-578. |
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| Authors: | Jun-Liang Zhao Li Chen |
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| Abstract: | |
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| Keywords: | open cluster-radial velocity-proper motion -luminosity distance-velocity distance |
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