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THE RADIAL DISTRIBUTIONS OF THE TWO MAIN-SEQUENCE COMPONENTS IN THE YOUNG MASSIVE STAR CLUSTER NGC 1856
Li, Chengyuan1; de Grijs, Richard2,3,4; Deng, Licai5; Milone, Antonino P.6
2017-01-10
Source PublicationASTROPHYSICAL JOURNAL
Volume834Issue:2
AbstractThe recent discovery of double main sequences in the young, massive star cluster NGC 1856 has caught significant attention. The observations can be explained by invoking two stellar generations with different ages and metallicities or by a single generation of stars composed of two populations characterized by different rotation rates. We analyzed the number ratios of stars belonging to both main-sequence components in NGC 1856 as a function of radius. We found that their number ratios remain approximately unchanged from the cluster's central region to its periphery, indicating that both components are homogeneously distributed in space. Through a comparison of the loci of the best-fitting isochrones with the ridge lines of both stellar components, we found that both multiple stellar populations and rapid stellar rotation can potentially explain the observed main-sequence bifurcation in NGC 1856. However, if NGC 1856 were a young representative of the old globular clusters, then the multiple stellar populations model would not be able to explain the observed homogeneity in the spatial distributions of these two components, since all relevant scenarios would predict that the second stellar generation should be formed in a more compact configuration than that of the first stellar generation, while NGC 1856 is too young for both stellar generations to have been fully mixed dynamically. We speculate that the rapid stellar rotation scenario would be the favored explanation of the observed multiple stellar sequences in NGC 1856.
SubtypeArticle
KeywordGlobular Clusters: Individual (Ngc 1856) Hertzsprung-russell And C-m Diagrams Magellanic Clouds
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationMacquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(11373010 ; National Natural Science Foundation of China(11373010 ; Australian Research Council(DE150101816) ; Australian Research Council(DE150101816) ; 11633005 ; 11633005 ; U1631102) ; U1631102) ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(11373010 ; National Natural Science Foundation of China(11373010 ; Australian Research Council(DE150101816) ; Australian Research Council(DE150101816) ; 11633005 ; 11633005 ; U1631102) ; U1631102)
DOI10.3847/1538-4357/834/2/156
WOS KeywordMULTIPLE STELLAR POPULATIONS ; GALACTIC GLOBULAR-CLUSTERS ; INTERMEDIATE-AGE CLUSTERS ; MAGELLANIC CLOUD CLUSTERS ; UV LEGACY SURVEY ; PRIMORDIAL BINARY POPULATION ; SELF-ENRICHMENT SCENARIOS ; SUB-GIANT BRANCH ; TURN-OFF ; RED CLUMP
Indexed BySCI
Language英语
Funding OrganizationMacquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(11373010 ; National Natural Science Foundation of China(11373010 ; Australian Research Council(DE150101816) ; Australian Research Council(DE150101816) ; 11633005 ; 11633005 ; U1631102) ; U1631102) ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(11373010 ; National Natural Science Foundation of China(11373010 ; Australian Research Council(DE150101816) ; Australian Research Council(DE150101816) ; 11633005 ; 11633005 ; U1631102) ; U1631102)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000393759200018
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8259
Collection光学天文研究部
Affiliation1.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
2.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China
3.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China
4.Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China
6.Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Cotter Rd, Weston, ACT 2611, Australia
Recommended Citation
GB/T 7714
Li, Chengyuan,de Grijs, Richard,Deng, Licai,et al. THE RADIAL DISTRIBUTIONS OF THE TWO MAIN-SEQUENCE COMPONENTS IN THE YOUNG MASSIVE STAR CLUSTER NGC 1856[J]. ASTROPHYSICAL JOURNAL,2017,834(2).
APA Li, Chengyuan,de Grijs, Richard,Deng, Licai,&Milone, Antonino P..(2017).THE RADIAL DISTRIBUTIONS OF THE TWO MAIN-SEQUENCE COMPONENTS IN THE YOUNG MASSIVE STAR CLUSTER NGC 1856.ASTROPHYSICAL JOURNAL,834(2).
MLA Li, Chengyuan,et al."THE RADIAL DISTRIBUTIONS OF THE TWO MAIN-SEQUENCE COMPONENTS IN THE YOUNG MASSIVE STAR CLUSTER NGC 1856".ASTROPHYSICAL JOURNAL 834.2(2017).
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