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Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)1,2; Soonthornthum, B3; Yuan JZ(袁金照)1,2; Yang YG(杨远贵)1,2; He JJ(何家佳)1,2; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2005-09
卷号130期号:3页码:1206-1211
DOI10.1086/432544
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual ( V857 Herculis)
摘要Charge-coupled device (CCD) photometric light curves in the B, V, and R bands of the complete eclipsing binary star V857 Her are presented. It is shown that the light curves of the W UMa-type binary are symmetric and of A type according to Binnendijk's classification. Our four epochs of light minimum along with others compiled from the literature were used to revise the period and study the period change. Weak evidence indicates that the orbital period of V857 Her may show a continuous increase at a rate of dP/dt = +2.90 x 10(-7) days yr(-1). The photometric parameters of the system were determined with the 2003 version of the Wilson-Devinney code. It is shown that V857 Her is a deep overcontact binary system with f = 83.8% +/- 5.1%. The derived mass ratio of q = 0.06532 +/- 0.0002 suggests that it has the lowest mass ratio among overcontact binary systems. As the orbital period increases, the decrease of the mass ratio will cause it to evolve into a single rapidly rotating star when it meets the more familiar criterion that the orbital angular momentum be less than 3 times the total spin angular momentum. To understand the evolutionary state of the system, long-term photometric monitoring and spectroscopic observations will be required.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2005-08-24
WOS记录号WOS:000231450900023
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LIMB-DARKENING COEFFICIENTS ; AW-URSAE-MAJORIS ; PARAMETERS ; STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5777
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1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China
3.Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
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Qian SB,Zhu LY,Soonthornthum, B,et al. Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis[J]. ASTRONOMICAL JOURNAL,2005,130(3):1206-1211.
APA Qian SB.,Zhu LY.,Soonthornthum, B.,Yuan JZ.,Yang YG.,...&Qian, SB .(2005).Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis.ASTRONOMICAL JOURNAL,130(3),1206-1211.
MLA Qian SB,et al."Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis".ASTRONOMICAL JOURNAL 130.3(2005):1206-1211.
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