Photometric studies of twelve deep, low-mass ratio overcontact binary systems
文献类型：会议论文
| 作者 | Qian SB(钱声帮) ; Yang YG(杨远贵); Zhu LY(朱俐颖); He JJ(何家佳); Yuan JZ(袁金照)
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| 出版日期 | 2006-08 |
| 会议名称 | Conference on Close Binary Stars in the 21st Century - New Opportunities and Challenges |
| 会议日期 | 2005-06-27 |
| 会议地点 | Syros, GREECE |
| 关键词 | stars : binaries : close stars : binaries : eclipsing stars : individuals (FG Hya CU Tau stars : evolution GR Vir' IK Per V857 Her TV Mus V410 Aur XY Boo SX CrV QX And. GSC 619-232 and AH Cnc) |
| 卷号 | 304 |
| 期号 | 1-4 |
| 页码 | 25-28 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | The formations of the blue straggler stars and the FK Com-type stars are unsolved problems in stellar astrophysics. One of the possibilities for their formations is from the coalescence of W UMa-type overcontact binary systems. Therefore, deep (f > 50%), low-mass ratio (q < 0.25) overcontact binary stars are a very important source to understand the phenomena of Blue Straggler/FK Com-type stars. Recently, 12 W UMa-type binary stars, FG Hya, GR Vir, IK Per, TV Mus, CU Tau, V857 Her, V410 Aur, XY Boo, SX CrV, QX And, GSC 619-232, and AH Cnc, were investigated photometrically. Apart from TV Mus, XY boo, and GSC 619-232, new observations of the other 9 binaries were obtained. Complete light curves of the 10 systems, FG Hya, GR Vir, IK Per, TV Mus, CU Tau, V857 Her, GSC 619-232, V410 Aur, XY Boo, and AH Cnc, were analyzed with the 2003 version of the W-D code. It is shown that all of those systems are deep (f > 50%), low-mass ratio (q < 0.25) overcontact binary stars. We found that the system GSC 619-232 has the highest degree of overcontact (f = 93.4%). The derived photometric mass ratio of V857 Her, q = 0.0653, indicates that it is the lowest-mass ratio system among W UMa-type binaries. Of the 12 sample stars, long-term period changes of 11 systems were found. About 58% (seven) of the sample binaries show cyclic period oscillation. No cyclic period changes were discovered for the other 5 systems, which may be caused by the short observational time interval or by insufficient observations. Therefore, we think that all W UMa-type binary stars may contain cyclic period variations. By considering the long-term period changes (both increase and decrease) of those binary stars, we proposed two evolutionary scenarios evolving from deep, low-mass ratio overcontact binaries into Blue Straggler/FK Com-type stars. |
| 收录类别 | SCI ; CPCI |
| 产权排序 | 第一完成单位 |
| 会议网址 | http://link.springer.com/article/10.1007%2Fs10509-006-9114-z |
| 会议录 | ASTROPHYSICS AND SPACE SCIENCE
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| 会议录出版者 | SPRINGER |
| 学科主题 | Astronomy & Astrophysics |
| 会议录出版地 | VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS |
| 语种 | 英语 |
| ISSN号 | 0004-640X |
| WOS记录号 | WOS:000242284000007 |
| 研究领域[WOS] | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5945]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 作者单位 | National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011, Kunming, P.R. China |
| 推荐引用方式 GB/T 7714 | Qian SB,Yang YG,Zhu LY,et al. Photometric studies of twelve deep, low-mass ratio overcontact binary systems[C]. 见:Conference on Close Binary Stars in the 21st Century - New Opportunities and Challenges. Syros, GREECE. 2005-06-27.http://link.springer.com/article/10.1007%2Fs10509-006-9114-z. |
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来源：云南天文台
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