| Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy |
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| 作者姓名： | Zhen-Yu Wu Jia-Ji Wang and Li ChenShanghai Astronomical Observatory Chinese Academy of Sciences Shanghai National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Zhen-Yu Wu，Jia-Ji Wang and Li ChenShanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030 National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | We examine 14 plates of the globular cluster M3 (NGC 5272) taken with the 40 cm refractor at the Sheshan station of Shanghai Astronomical Observatory. The plates span over a period of about 77 years. The positions and absolute proper motions of eight stars in the Hipparcos Catalogue and of 49 stars in the Tycho-2 Catalogue are used as the reference frame. The astrometric reduction is made with the central overlapping principle. The absolute proper motions of 534 stars in a region of about 100' × 100' around the cluster are measured. With the new proper motion data the membership probabilities of the stars are determined. The average absolute proper motion obtained for the cluster is -0.06@0.30 mas yr-1 in R.A. and -2.6@0.30 mas yr-1 in Decl. By combining this result with the known distance and radial velocity of the cluster, we also obtained the Galactic orbit of M3 for a chosen three-component Galactic potential.
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| 关 键 词： | M3星簇 银河系 运行轨道 球状星簇 |
Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy |
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| Zhen-Yu Wu,Jia-Ji Wang and Li ChenShanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai National Astronomical Observatories,Chinese Academy of Sciences,Beijing .Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy[J].Chinese Journal of Astronomy and Astrophysics,2002,2(3):216-225. |
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| Authors: | Zhen-Yu Wu Jia-Ji Wang Li Chen |
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| Abstract: | We examine 14 plates of the globular cluster M3 (NGC 5272) taken withthe 40 cm refractor at the Sheshan station of Shanghai Astronomical Observatory.The plates span over a period of about 77 years. The positions and absolute propermotions of eight stars in the Hipparcos Catalogue and of 49 stars in the Tycho-2Catalogue are used as the reference frame. The astrometric reduction is made withthe central overlapping principle. The absolute proper motions of 534 stars in aregion of about 100′× 100′ around the cluster are measured. With the new propermotion data the membership probabilities of the stars are determined. The averageabsolute proper motion obtained for the cluster is -0.06±0.30 mas yr-1 in R.A.and -2.6±0.30 mas yr-1 in Decl. By combining this result with the known distanceand radial velocity of the cluster, we also obtained the Galactic orbit of M3 for achosen three-component Galactic potential. |
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| Keywords: | globular clusters - star cluster: membership probabilities - star cluster: proper motions - star cluster: space motions - star cluster: Galactic orbits |
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