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Bo canum venaticorum and SS Comae berenices: A photometric study of AW UMa-type binaries
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)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
2006-02
卷号131期号:2页码:1032-1043
DOI10.1086/499492
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 (Bo Cvn Ss Com)
摘要BO CVn and SS Com are two short-period W UMa-type binary stars with spectral types earlier than F5. In the present paper new CCD photometric light curves in B, V, and R bands of BO CVn and the first complete light curve in V band of SS Com are presented. The light curves of the two binaries are symmetric, and no variations of the light curves were found for both systems that are quite unlike those of cooler overcontact binaries. These observational properties may suggest weak photospheric dark spot activity in the two systems during the observational time intervals. Photometric solutions of the two W UMa-type binaries were derived by using the 2003 version of the Wilson-Devinney (W-D) method. The new solutions suggest that they are overcontact binary stars with degrees of overcontact of f = 40.6% for BO CVn and f = 49.6% for SS Com. Our new times of light minimum confirmed the long-time period increases of the two systems, and the rates of continuous period increase were revised. The longtime period increases, the orbital periods, the degrees of overcontact, and the mass ratios all suggest that they are on an evolutionary stage of mass transfer from the less massive component to the more massive one, and SS Com will reach the present evolutionary state of BO CVn. The slow evolution toward extreme mass ratio will cause them finally to coalesce to single stars. Therefore, both of them are AW UMa-type near-coalescent overcontact binary systems.
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2006-02-07
WOS记录号WOS:000235214500034
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; LIMB-DARKENING COEFFICIENTS ; MASS-RATIO ; PERIOD ; SYSTEMS ; PEGASI ; LEONIS ; TAURI ; DEEP
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5792
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
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Qian SB,Zhu LY,Qian, SB . Bo canum venaticorum and SS Comae berenices: A photometric study of AW UMa-type binaries[J]. ASTRONOMICAL JOURNAL,2006,131(2):1032-1043.
APA Qian SB,Zhu LY,&Qian, SB .(2006).Bo canum venaticorum and SS Comae berenices: A photometric study of AW UMa-type binaries.ASTRONOMICAL JOURNAL,131(2),1032-1043.
MLA Qian SB,et al."Bo canum venaticorum and SS Comae berenices: A photometric study of AW UMa-type binaries".ASTRONOMICAL JOURNAL 131.2(2006):1032-1043.
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