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Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30
Jiang DK(姜登凯)1,2,3; Chen XF(陈雪飞)1,2,3; Li LF(李立芳)1,2,3; Han ZW(韩占文)1,2,3
Source PublicationASTROPHYSICAL JOURNAL
2017-11-10
Volume849Issue:2
DOI10.3847/1538-4357/aa8ee1
Contribution Rank第1完成单位
Indexed BySCI
Keywordbinaries: general blue stragglers globular clusters: individual (M30, NGC 7099) stars: evolution
Abstract

Two blue-straggler sequences discovered in globular cluster M30 provide a strong constraint on the formation mechanisms of blue stragglers. We study the formation of blue-straggler binaries through binary evolution, and find that binary evolution can contribute to the blue stragglers in both of the sequences. Whether a blue-straggler is located in the blue sequence or red sequence depends on the contribution of the mass donor to the total luminosity of the binary, which is generally observed as a single star in globular clusters. The blue stragglers in the blue sequence have a cool white dwarf companion, while the majority (similar to 60%) of the objects in the red sequence are binaries that are still experiencing mass transfer. However, there are also some objects for which the donors have just finished the mass transfer (the stripped-core stars, similar to 10%) or the blue stragglers (the accretors) have evolved away from the blue sequence (similar to 30%). Meanwhile, W UMa contact binaries found in both sequences may be explained by various mass ratios, that is, W UMa contact binaries in the red sequence have two components with comparable masses (e.g., mass ratio q similar to 0.3-1.0), while those in the blue sequence have low mass ratios (e.g., q < 0.3). However, the fraction of the blue sequence in M30 cannot be reproduced by binary population synthesis if we assumed the initial parameters of a binary sample to be the same as those of the field. This possibly indicates that dynamical effects on binary systems are very important in globular clusters.

Funding ProjectNatural Science Foundation of China[11573061] ; Natural Science Foundation of China[11521303] ; Natural Science Foundation of China[11733008] ; Natural Science Foundation of China[11422324] ; Natural Science Foundation of China[11773065] ; Natural Science Foundation of China[11661161016] ; Natural Science Foundation of Yunnan Province[2017HC018] ; Natural Science Foundation of Yunnan Province[2013HA005] ; Natural Science Foundation of Yunnan Province[2015FB190] ; ISSI ; ISSI-BJ
Funding OrganizationNatural Science Foundation of China[11573061, 11521303, 11733008, 11422324, 11773065, 11661161016] ; Natural Science Foundation of Yunnan Province[2017HC018, 2013HA005, 2015FB190] ; ISSI ; ISSI-BJ
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000414587300020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSECULAR ORBITAL EVOLUTION ; INITIAL MASS FUNCTION ; SOLAR-TYPE STARS ; CONTACT BINARIES ; MAIN-SEQUENCE ; INTERACTING BINARIES ; ECLIPSING BINARIES ; STELLAR EVOLUTION ; CLOSE BINARIES ; DYNAMICAL EVOLUTION
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11957
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorJiang DK(姜登凯)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P.R. China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Jiang DK,Chen XF,Li LF,et al. Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30[J]. ASTROPHYSICAL JOURNAL,2017,849(2).
APA Jiang DK,Chen XF,Li LF,&Han ZW.(2017).Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30.ASTROPHYSICAL JOURNAL,849(2).
MLA Jiang DK,et al."Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30".ASTROPHYSICAL JOURNAL 849.2(2017).
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