The orbits of open clusters in the Galaxy
文献类型：期刊论文
| 作者 | Wu, Zhen-Yu1 ; Zhou, Xu1; Ma, Jun1; Du, Cui-Hua1,2
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2009-11-11 |
| 卷号 | 399期号:4页码:2146-2164 |
| 关键词 | Galaxy: disc Galaxy: kinematics and dynamics open cluster and associations: general |
| 英文摘要 | We present and analyse the kinematics and orbits for a sample of 488 open clusters (OCs) in the Galaxy. The velocity ellipsoid for our present sample is derived as (sigma(U), sigma(V), sigma(W)) = (28.7, 15.8, 11.0) km s(-1) which represents a young thin-disc population. We also confirm that the velocity dispersions increase with the age of a cluster subsample. The orbits of OCs are calculated with three Galactic gravitational potential models. The errors of orbital parameters are also calculated considering the intrinsic variation of the orbital parameters and the effects of observational uncertainties. The observational uncertainties dominate the errors of derived orbital parameters. The vertical motions of clusters calculated using different Galactic disc models are rather different. The observed radial metallicity gradient of clusters is derived with a slope of b = -0.070 +/- 0.011 dex kpc (1). The radial metallicity gradient of clusters based on their apogalactic distances is also derived with a slope of b = -0.082 +/- 0.014 dex kpc (1). The distribution of derived orbital eccentricities for OCs is very similar to that derived for the field population of dwarfs and giants in the thin disc. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000271469000035 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7588]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Zhen-Yu,Zhou, Xu,Ma, Jun,et al. The orbits of open clusters in the Galaxy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,399(4):2146-2164. |
| APA | Wu, Zhen-Yu,Zhou, Xu,Ma, Jun,&Du, Cui-Hua.(2009).The orbits of open clusters in the Galaxy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,399(4),2146-2164. |
| MLA | Wu, Zhen-Yu,et al."The orbits of open clusters in the Galaxy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 399.4(2009):2146-2164. |
入库方式： OAI收割
来源：国家天文台
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