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Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST
Ye,Xianhao1,2; Zhao,Jingkun1; Liu,Jiaming1; Bird,Sarah A.1; Liu,Chao2,3; Liang,Xilong1,2; Zhang,Jiajun1,2; Zhao,Gang1,2
2020-12-02
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume161Issue:1
AbstractAbstract We identify 1325 member candidates of the open cluster (OC) Stock 2 using data from Gaia DR2. We use the algorithms Clusterix 2.0 and HDBSCAN to select cluster candidates and further refine the final cluster membership by defining neighbors in 5D phase space (X cp,?Y cp, /?,?κ?·?μ δ /?). Among these candidates, less than half have G, G BP, and G RP extinctions from Gaia. When Gaia extinctions are unavailable, we compute extiction using empirical formulas and E(B???V)?=?0.350. We analyze the spatial distribution and mass profile of Stock 2. Our results reveal Stock 2 is still a bound OC and we find evidence of mass segregation. By comparing initial mass functions, the present-day mass function indicates that Stock 2 is a massive stellar cluster with a mass of 4000 M ⊙. The core radius and tidal radius, calculated via the radial density profile and total mass, are 3.97 pc and 22.65 pc, respectively. Common stars between our selected member candidates and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope DR7 medium-resolution catalog give a metalliclity of [Fe/H]?=??0.040?±?0.147.
KeywordOpen star clusters
DOI10.3847/1538-3881/abc61a
Language英语
WOS IDIOP:0004-6256-161-1-abc61a
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/57723
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China zjk@bao.ac.cn
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3.CAS Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ye,Xianhao,Zhao,Jingkun,Liu,Jiaming,et al. Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST[J]. The Astronomical Journal,2020,161(1).
APA Ye,Xianhao.,Zhao,Jingkun.,Liu,Jiaming.,Bird,Sarah A..,Liu,Chao.,...&Zhao,Gang.(2020).Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST.The Astronomical Journal,161(1).
MLA Ye,Xianhao,et al."Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST".The Astronomical Journal 161.1(2020).
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