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Photometric studies of twelve deep, low-mass ratio overcontact binary systems
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); Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
会议录名称ASTROPHYSICS AND SPACE SCIENCE
2006-08
卷号304
期号1-4
页码25-28
DOI10.1007/s10509-006-9114-z
产权排序第1完成单位
收录类别SCI ; CPCI
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 Stars : Evolution Gr Vir' Ik Per Cu Tau Tv Mus V857 Her V410 Aur Xy Boo Sx Crv Qx And. Gsc 619-232 And Ah Cnc)
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.
语种英语
学科领域Astronomy & Astrophysics
出版者SPRINGER
出版地VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN号0004-640X
URL查看原文
归档日期2006-12-06
WOS记录号WOS:000242284000007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS标题词Science & Technology ; Physical Sciences
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被引频次:22[WOS]   [WOS记录]     [WOS相关记录]
文献类型会议论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5945
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011, Kunming, P.R. China
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GB/T 7714
Qian SB,Yang YG,Zhu LY,et al. Photometric studies of twelve deep, low-mass ratio overcontact binary systems[C]. VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS:SPRINGER,2006:25-28.
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