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Two contact binaries at different evolutionary stages in the globular cluster NGC 6397
Li K(李凯)1,2,3; Qian SB(钱声帮)1,2; 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
2013-12
卷号25页码:12-18
DOI10.1016/j.newast.2013.03.012
产权排序第1完成单位
收录类别SCI
关键词Globular Clusters: Individual: Ngc 6397 Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Blue: Stragglers
摘要NGC 6397 is the second closest globular cluster in the Milky Way. Photometric solutions of two EW-type binaries, V7 and V8, in this cluster are presented by analyzing two sets light curves obtained by Kaluzny et al. We find that both of the two systems are contact binaries. V7 is a shallow contact W-type W UMa system with a contact degree of f=2.7%, while V8 is an extremely low mass ratio (similar to 0.159) A-type W UMa system with a contact degree of f=46.1%. We also analyzed the orbital period changes of the two binaries, long-term period increase has been detected for both binaries. The period increase may be caused by mass transfer from the less massive component to the more massive one. As the period increase, for V7, it will evolve to the expanding stage of the thermal relaxation oscillation cycle; for V8, it will merge into a rapidly rotating single star after the orbital angular momentum is less than three times the total spin angular momentum. On the color-magnitude diagram of NGC 6397, V7 occupies a position close to the cluster turn off,'while V8 is located in faint blue straggler region. Therefore, V8 is an eclipsing blue straggler candidate and could be formed by mass transfer. By comparing the two binaries with contact binaries in the field, we find that evolutionary processes of contact binaries in the globular cluster low metallicity environment may be similar with that of contact binaries in the field high metallicity environment. (C) 2013 Elsevier B.V. All rights reserved.
项目资助者Chinese Natural Science Foundation [11203066, 11133007, 11103074, 10973037, 10903026] ; 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
URL查看原文
归档日期2015-11-17
WOS记录号WOS:000322805300003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]URSAE MAJORIS SYSTEMS ; PHYSICAL PARAMETERS ; MARGINAL-CONTACT ; ECLIPSING BINARIES ; MAIN-SEQUENCE ; COMAE BERENICES ; LIGHT CURVES ; STARS ; COMPONENTS ; NGC-6397
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被引频次:7[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/114a53/5874
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.University of the Chinese Academy of Sciences, Beijing 100049, China
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GB/T 7714
Li K,Qian SB,Li, K . Two contact binaries at different evolutionary stages in the globular cluster NGC 6397[J]. NEW ASTRONOMY,2013,25:12-18.
APA Li K,Qian SB,&Li, K .(2013).Two contact binaries at different evolutionary stages in the globular cluster NGC 6397.NEW ASTRONOMY,25,12-18.
MLA Li K,et al."Two contact binaries at different evolutionary stages in the globular cluster NGC 6397".NEW ASTRONOMY 25(2013):12-18.
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