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Discovery of Extended Main-sequence Turnoffs in Four Young Massive Clusters in the Magellanic Clouds
Li, Chengyuan1; de Grijs, Richard2,3,4; Deng, Licai5; Milone, Antonino P.6
2017-08-01
Source PublicationASTROPHYSICAL JOURNAL
Volume844Issue:2
AbstractAn increasing number of young massive clusters (YMCs) in the Magellanic Clouds have been found to exhibit bimodal or extended main sequences (MSs) in their color-magnitude diagrams (CMDs). These features are usually interpreted in terms of a coeval stellar population with different stellar rotational rates, where the blue and red MS stars are populated by non- (or slowly) and rapidly rotating stellar populations, respectively. However, some studies have shown that an age spread of several million years is required to reproduce the observed wide turnoff regions in some YMCs. Here we present the ultraviolet-visual CMDs of four Large and Small Magellanic Cloud YMCs, NGC 330, NGC 1805, NGC 1818, and NGC 2164, based on high-precision Hubble Space Telescope photometry. We show that they all exhibit extended main-sequence turnoffs (MSTOs). The importance of age spreads and stellar rotation in reproducing the observations is investigated. The observed extended MSTOs cannot be explained by stellar rotation alone. Adopting an age spread of 35-50 Myr can alleviate this difficulty. We conclude that stars in these clusters are characterized by ranges in both their ages and rotation properties, but the origin of the age spread in these clusters remains unknown.
SubtypeArticle
KeywordHertzsprung-russell And C-m Diagrams Globular Clusters: Individual (Ngc 330 Magellanic Clouds Ngc 1805 Ngc 1818 Ngc 2164)
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationMacquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(U1631102 ; National Natural Science Foundation of China(U1631102 ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; 11373010 ; 11373010 ; 11633005) ; 11633005) ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(U1631102 ; National Natural Science Foundation of China(U1631102 ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; 11373010 ; 11373010 ; 11633005) ; 11633005)
DOI10.3847/1538-4357/aa7b36
WOS KeywordMULTIPLE STELLAR POPULATIONS ; AGE STAR-CLUSTERS ; DISTANCES PUBLICATION BIAS ; BLUE STRAGGLER STARS ; GLOBULAR-CLUSTERS ; ASTROPHYSICS MESA ; RED CLUMP ; DYNAMICAL MODELS ; NGC 1856 ; ROTATION
Indexed BySCI
Language英语
Funding OrganizationMacquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(U1631102 ; National Natural Science Foundation of China(U1631102 ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; 11373010 ; 11373010 ; 11633005) ; 11633005) ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Natural Science Foundation of China(U1631102 ; National Natural Science Foundation of China(U1631102 ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; Australian Research Council through a Discovery Early Career Researcher Award(DE150101816) ; 11373010 ; 11373010 ; 11633005) ; 11633005)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406476400008
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20069
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, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
6.Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Cotter Rd, Weston, ACT 2611, Australia
Recommended Citation
GB/T 7714
Li, Chengyuan,de Grijs, Richard,Deng, Licai,et al. Discovery of Extended Main-sequence Turnoffs in Four Young Massive Clusters in the Magellanic Clouds[J]. ASTROPHYSICAL JOURNAL,2017,844(2).
APA Li, Chengyuan,de Grijs, Richard,Deng, Licai,&Milone, Antonino P..(2017).Discovery of Extended Main-sequence Turnoffs in Four Young Massive Clusters in the Magellanic Clouds.ASTROPHYSICAL JOURNAL,844(2).
MLA Li, Chengyuan,et al."Discovery of Extended Main-sequence Turnoffs in Four Young Massive Clusters in the Magellanic Clouds".ASTROPHYSICAL JOURNAL 844.2(2017).
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