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3D cluster members and near-infrared distance of open cluster NGC 6819

文献类型：期刊论文

作者Gao, Xin-Hua1; Xu, Shou-Kun1; Chen, Li2
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2015-12-01
卷号15期号:12页码:2193-2203
关键词open clusters and associations: individual (NGC 6819) Hertzsprung-Russell and C-M diagrams stars: kinematics and dynamics stars: distances
英文摘要In order to obtain clean members of the open cluster NGC 6819, the proper motions and radial velocities of 1691 stars are used to construct a three-dimensional (3D) velocity space. Based on the DBSCAN clustering algorithm, 537 3D cluster members are obtained. From the 537 3D cluster members, the average radial velocity and absolute proper motion of the cluster are V-r = +2.30 +/- 0.04 km s(-1) and (PMRA, PMDec) = (-2.5 +/- 0.5, -4.3 +/- 0.5) mas yr(-1), respectively. The proper motions, radial velocities, spatial positions and color-magnitude diagram of the 537 3D members indicate that our membership determination is effective. Among the 537 3D cluster members, 15 red clump giants can be easily identified by eye and are used as reliable standard candles for the distance estimate of the cluster. The distance modulus of the cluster is determined to be (m - M)(0) = 11.86 +/- 0.05 mag (2355 +/- 54 pc), which is quite consistent with published values. The uncertainty of our distance modulus is dominated by the intrinsic dispersion in the luminosities of red clump giants (similar to 0.04 mag).
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]WIYN OPEN CLUSTER ; RED CLUMP STARS ; RELATIVE PROPER MOTIONS ; HUBBLE-SPACE-TELESCOPE ; OLD OPEN CLUSTER ; ECLIPSING BINARY ; CCD PHOTOMETRY ; MAIN-SEQUENCE ; METALLICITY ; KEPLER
收录类别SCI
语种英语
WOS记录号WOS:000367563300007
源URL[http://119.78.226.72/handle/331011/28502]  
专题上海天文台_星系宇宙学重点实验室
作者单位1.Changzhou Univ, Sch Informat Sci & Engn, Changzhou 213164, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式
GB/T 7714		 Gao, Xin-Hua,Xu, Shou-Kun,Chen, Li. 3D cluster members and near-infrared distance of open cluster NGC 6819[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(12):2193-2203.
APA Gao, Xin-Hua,Xu, Shou-Kun,&Chen, Li.(2015).3D cluster members and near-infrared distance of open cluster NGC 6819.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(12),2193-2203.
MLA Gao, Xin-Hua,et al."3D cluster members and near-infrared distance of open cluster NGC 6819".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.12(2015):2193-2203.

入库方式： OAI收割

来源：上海天文台

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