Two contact binaries at different evolutionary stages in the globular cluster NGC 6397
文献类型：期刊论文
| 作者 | Li K(李凯)1,2,3 ; Qian SB(钱声帮)1,2
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| 刊名 | NEW ASTRONOMY
 |
| 出版日期 | 2013-12 |
| 卷号 | 25页码:12-18 |
| 关键词 | Globular clusters: Individual: NGC 6397 Stars: binaries: close Stars: binaries: eclipsing Stars: blue: stragglers |
| ISSN号 | 1384-1076 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Li, K (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S1384107613000389 |
| 语种 | 英语 |
| WOS记录号 | WOS:000322805300003 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5874]  |
| 专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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 |
| 推荐引用方式 GB/T 7714 | Li K,Qian SB. 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.(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. |
入库方式： OAI收割
来源：云南天文台
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