NAOC Open IR
A study of stellar population of intermediate-age globular cluster NGC 2249
Li, Zhongmu1; Spurzem, Rainer2,3,4; Mao, Caiyan1; Ma, Yingxin1,5; Deng, Yangyang1,5
2020-06-01
Source PublicationRESULTS IN PHYSICS
ISSN2211-3797
Volume17Pages:7
AbstractThe Large Magellanic Cloud (LMC) star cluster NGC 2249 has been found to exhibit an extended main-sequence turn-off (eMSTO) in the color-magnitude diagram (CMD) derived from the data of the Hubble Space Telescope (HST). Such CMDs can potentially be explained via a spread of stellar age or rotation rate of single-aged stars, leading to a confusion of its stellar population type. In this work, we use different combinations of age spread (A), rotation (R), and binarity (B) to study the stellar population of this cluster, via a deep HST CMD. Because binaries are commonly observed in star clusters, three models of this study take binaries into account. We finally derive the best-fit stellar population parameters, i.e., metallicity (Z = 0.008), age (0.7-1.0 Gyr), reddening (E (B - I) = 0.52-0.55mag), distance modulus (18.54-18.57mag), binary fraction (50%), rotating star fraction (0-50%), and star formation history mode for NGC 2249. We find that both age spread (A+ B or A+ R+ B) and rotating stars (R+ B) can reproduce the main CMD features well, while rotation alone does not reproduce the detailed eMSTO morphology. This suggests that an age spread of 200Myrs is needed to form the eMSTO of cluster NGC 2249, even if stellar rotation is taken into account. Dynamical simulation could be useful for revealing the origin of the eMSTO.
Keyword(stars:) Hertzsprung-Russell and C-M diagrams (Galaxy:) globular clusters: general Galaxies: star clusters Globular clusters: individual (NGC 2249) (stars:) binaries: visual
Funding OrganizationChinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project
DOI10.1016/j.rinp.2020.103144
WOS KeywordCOLOR-MAGNITUDE DIAGRAMS ; LARGE-MAGELLANIC-CLOUD ; STAR-CLUSTERS ; MULTIPLE POPULATIONS ; BINARY ; EVOLUTION ; NGC-2249 ; CATALOG ; I.
Language英语
Funding ProjectChinese National Science Foundation[11863002] ; Chinese National Science Foundation[11563002] ; Chinese National Science Foundation[11673032] ; Sino-German Cooperation Project[GZ 1284]
Funding OrganizationChinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project ; Chinese National Science Foundation ; Chinese National Science Foundation ; Sino-German Cooperation Project ; Sino-German Cooperation Project
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Multidisciplinary
WOS IDWOS:000548698400014
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82740
Collection中国科学院国家天文台
Corresponding AuthorLi, Zhongmu
Affiliation1.Dali Univ, Inst Astron & Hist Sci & Technol, Dali 671003, Peoples R China
2.Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany
3.Chinese Acad Sci, Natl Astron Observ China, Key Lab Computat Astrophys, NAOC,CAS, 20A Datun Rd, Beijing 100012, Peoples R China
4.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yi He Yuan Rd 5, Beijing 100871, Peoples R China
5.Shanghai Normal Univ, Shanghai Key Lab Astrophys, Shanghai 200234, Peoples R China
Recommended Citation
GB/T 7714
Li, Zhongmu,Spurzem, Rainer,Mao, Caiyan,et al. A study of stellar population of intermediate-age globular cluster NGC 2249[J]. RESULTS IN PHYSICS,2020,17:7.
APA Li, Zhongmu,Spurzem, Rainer,Mao, Caiyan,Ma, Yingxin,&Deng, Yangyang.(2020).A study of stellar population of intermediate-age globular cluster NGC 2249.RESULTS IN PHYSICS,17,7.
MLA Li, Zhongmu,et al."A study of stellar population of intermediate-age globular cluster NGC 2249".RESULTS IN PHYSICS 17(2020):7.
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