| Kinematics of the Open Cluster System in the Galaxy |
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| 作者姓名： | Jun-Liang Zhao Li Chen and Zhong-Liang Zu Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai |
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| 作者单位： | Jun-Liang Zhao，Li Chen and Zhong-Liang Zu Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | Absolute proper motions and radial velocities of 202 open clusters in the solar neighborhood, which can be used as tracers of the Galactic disk, are used to investigate the kinematics of the Galaxy in the solar vicinity, including the mean heliocentric velocity components (u_1,u_2,u_3) of the open cluster system, the characteristic velocity dispersions (σ_1,σ_2,σ_3), Oort constants (A, B) and the large-scale radial motion parameters (C,D) of the Galaxy. The results derived from the observational data of proper motions and radial velocities of a subgroup of 117 thin disk young open clusters by means of a maximum likelihood algorithm are: (u_1,u2,u3) = (-16.1±1.0, -7.9±1.4,-10.4±1.5) kms~(-1), (σ_1,σ_2,σ_3) = (17.0 ±0.7,12.2±0.9,8.0±1.3) kms~(-1),(A,B) = (14.8±1.0,-13.0±2.7) kms~(-1) kpc~(-1) ,and(C,D) = (1.5±0.7,-1.2±1.5) kms~(-1) kpc~(-1) . A discussion on the results and comparisons with what was obtained by other authors is given.
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| 关 键 词： | Galaxy: kinematics and dynamics—open clusters and associations: general |
Kinematics of the Open Cluster System in the Galaxy |
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| Jun-Liang Zhao,Li Chen and Zhong-Liang Zu Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai .Kinematics of the Open Cluster System in the Galaxy[J].Chinese Journal of Astronomy and Astrophysics,2006,6(3):287-296. |
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| Authors: | Jun-Liang Zhao Li Chen Zhong-Liang Zu |
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| Institution: | Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 |
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| Abstract: | |
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| Keywords: | Galaxy: kinematics and dynamics - open clusters and associations: general |
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