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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)
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2006-08
Volume304
Issue1-4
Pages25-28
DOI10.1007/s10509-006-9114-z
Contribution Rank第1完成单位
Indexed BySCI ; CPCI
Conference NameConference on Close Binary Stars in the 21st Century - New Opportunities and Challenges
Conference Date2005-06-27
Conference PlaceSyros, GREECE
KeywordStars : Binaries : Close Stars : Binaries : Eclipsing Stars : Individuals (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) Stars : Evolution
Abstract

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.

Funding OrganizationN/A
Language英语
Subject Area天文学 ; 天体物理学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle; Proceedings Paper
PublisherSPRINGER
Publication PlaceVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN0004-640X
URL查看原文
Archive Date2006-12-06
WOS IDWOS:000242284000007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5945
Collection双星与变星研究组
Corresponding AuthorQian SB(钱声帮)
AffiliationNational Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011, Kunming, P.R. China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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