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Two unusual contact binaries in the globular cluster M54
Li K(李凯)1,2,3; Qian SB(钱声帮)1,2,3; Li, K (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊NEW ASTRONOMY
2013-08
卷号22页码:57-61
DOI10.1016/j.newast.2013.01.006
产权排序第1完成单位
收录类别SCI
关键词Globular Clusters: Individual: M54 Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Blue Stragglers
摘要B, V and I light curves of V134 and B and V light curves of V144 have been analyzed by the W-D code. It is found that V134 is a middle mass ratio (q = 0.530) deep contact binary with a contact degree of f = 50.6% and V144 is an extremely low mass ratio (q = 0.160) shallow contact binary with a contact degree of f = 19.5%. The light curves of both of the two binaries show obvious O'Connell effect, this can be explained by employing dark spots on their secondary components. Based on the derived acceleration of gravity at the surface of the components, we found that the two contact binaries are very special, both components of the two binaries have possibly evolved off the main sequence and are likely to be subgiant stars. On the color-magnitude of M54, both of the two binaries are located in the blue straggler region. They are blue straggler candidates and may be formed by mass transfer. (C) 2013 Elsevier B.V. All rights reserved.
项目资助者Chinese Natural Science Foundation [11133007, 10973037, 10903026, 11103074] ; West Light Foundation of the Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
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WOS记录号WOS:000316093300009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SAGITTARIUS DWARF GALAXY ; LIGHT CURVES ; VARIABLE-STARS ; BLACK-HOLE ; SYSTEMS ; DEEP
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5884
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Li, K (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China
3.Graduate School of the CAS, 100049 Beijing, China
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GB/T 7714
Li K,Qian SB,Li, K . Two unusual contact binaries in the globular cluster M54[J]. NEW ASTRONOMY,2013,22:57-61.
APA Li K,Qian SB,&Li, K .(2013).Two unusual contact binaries in the globular cluster M54.NEW ASTRONOMY,22,57-61.
MLA Li K,et al."Two unusual contact binaries in the globular cluster M54".NEW ASTRONOMY 22(2013):57-61.
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