NAOC Open IR
Unveiling the Hierarchical Structure of Open Star Clusters: The Perseus Double Cluster
Yu, Heng1; Shao, Zhengyi2,3; Diaferio, Antonaldo4,5; Li, Lu6
2020-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume899Issue:2Pages:13
AbstractWe introduce a new kinematic method to investigate the structure of open star clusters. We adopt a hierarchical clustering algorithm that uses the celestial coordinates and the proper motions of the stars in the field of view of the cluster to estimate a proxy of the pairwise binding energy of the stars and arrange them in a binary tree. The cluster substructures and their members are identified by trimming the tree at two thresholds, according to the sigma-plateau method. Testing the algorithm on 100 mock catalogs shows that, on average, the membership of the identified clusters is (91.5 3.5)% complete and the fraction of unrelated stars is (10.4 2.0)%. We apply the algorithm to the stars in the field of view of the Perseus double cluster from the Data Release 2 of Gaia. This approach identifies a single structure, Sub1, that separates into two substructures, Sub1-1 and Sub1-2. These substructures coincide withhPer and chi Per: the distributions of the proper motions and the color-magnitude diagrams of the members of Sub1-1 and Sub1-2 are fully consistent with those ofhPer and chi Per reported in the literature. These results suggest that our hierarchical clustering algorithm can be a powerful tool to unveil the complex kinematic information of star clusters.
KeywordStellar kinematics stars: kinematics and dynamics Single-linkage hierarchical clustering Open star clusters Astronomy data analysis Astronomy data visualization
Funding OrganizationBureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence
DOI10.3847/1538-4357/aba8f3
WOS KeywordPROPER MOTIONS ; MEMBERSHIP PROBABILITIES ; MASS FUNCTION ; H-PERSEI ; REGION
Language英语
Funding ProjectBureau of International Cooperation, Chinese Academy of Sciences[GJHZ1864] ; National Key R&D Program of China[2019YFA0405501] ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence[L.232/2016]
Funding OrganizationBureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; INFN grant InDark ; INFN grant InDark ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence ; Italian Ministry of Education, University and Research (MIUR) under the Departments of Excellence
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000565735600001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82152
Collection中国科学院国家天文台
Corresponding AuthorYu, Heng
Affiliation1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Key Lab Astrophys, 100 Guilin Rd, Shanghai 200234, Peoples R China
4.Univ Torino, Dipartimento Fis, Via P Giuria 1, I-10125 Turin, Italy
5.Ist Nazl Fis Nucl INFN, Sez Torino, Via P Giuria 1, I-10125 Turin, Italy
6.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yu, Heng,Shao, Zhengyi,Diaferio, Antonaldo,et al. Unveiling the Hierarchical Structure of Open Star Clusters: The Perseus Double Cluster[J]. ASTROPHYSICAL JOURNAL,2020,899(2):13.
APA Yu, Heng,Shao, Zhengyi,Diaferio, Antonaldo,&Li, Lu.(2020).Unveiling the Hierarchical Structure of Open Star Clusters: The Perseus Double Cluster.ASTROPHYSICAL JOURNAL,899(2),13.
MLA Yu, Heng,et al."Unveiling the Hierarchical Structure of Open Star Clusters: The Perseus Double Cluster".ASTROPHYSICAL JOURNAL 899.2(2020):13.
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