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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; Jiang, Dengkai(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL
2017-11-10
卷号849期号:2
DOI10.3847/1538-4357/aa8ee1
产权排序第1完成单位
收录类别SCI
关键词Binaries: General Blue Stragglers Stars: Evolution Globular Clusters: Individual (M30 Ngc 7099)
摘要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.
项目资助者Natural Science Foundation of China(11573061, 11521303, 11733008, 11422324, 11773065, 11661161016) ; Natural Science Foundation of Yunnan Province(2017HC018, 2013HA005, 2015FB190) ; ISSI ; ISSI-BJ
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000414587300020
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SECULAR 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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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11957
专题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
通讯作者Jiang, Dengkai(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
作者单位1.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
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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,&Jiang, Dengkai.(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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