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An orbital period study of the WUMa-type binary RZ Comae Berenicis
Qian SB(钱声帮)1,2; He JJ(何家佳)2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2005
卷号57期号:6页码:977-982
产权排序第1完成单位
收录类别SCI
关键词Stars : Binaries : Close Stars : Binaries : Eclipsing Stars : Individual (Rz Comae Berenicis)
摘要New photoelectric and CCD photometry observations of a short-period W UMa-type binary system, RZ Com, are presented. The light curves of Broglia (1960, Contr. Milano-Merate, 165) were symmetric in V band, while the present light curve shows a typical O'Connell effect, with Maximum I brighter than Maximum II by 0.015 mag. It is found that the light curve of the binary star has changed from W-subtype to A-subtype according to Binnendijk's classification. This variation may be caused by the activity of dark spot on the primary component. Combining four newly determined times of the light minimum with others published in the literature, the orbital period change of the system was investigated. A small-amplitude oscillation (A = 0.0058 d), with a period of 44.8 yr has been discovered to be superimposed on a long-term period increase with a rate of dP/dt = +4.12 x 10(-8) d yr(-1). The period oscillation can be explained either by the light-time effect via the presence of an unseen third body or by magnetic-activity cycles of the components. The mass ratio of RZ Com is q = 0.43. The secular period variation is in agreement with the conclusions of Qian (2001, MNRAS, 328, 914; 2003, MNRAS, 342, 1260). This indicates that it is on the TRO-controlled stage of the evolutionary scheme proposed by Qian.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6264
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归档日期2005-12-21
WOS记录号WOS:000234607000011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; URSAE MAJORIS SYSTEMS ; CONTACT BINARIES ; LIGHT VARIATION ; CLOSE BINARIES ; AM LEONIS ; MODULATION ; ELEMENTS ; BOOTIS ; CURVE
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5783
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan 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, P. R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, P. R. China
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Qian SB,He JJ,Qian, SB . An orbital period study of the WUMa-type binary RZ Comae Berenicis[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2005,57(6):977-982.
APA Qian SB,He JJ,&Qian, SB .(2005).An orbital period study of the WUMa-type binary RZ Comae Berenicis.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,57(6),977-982.
MLA Qian SB,et al."An orbital period study of the WUMa-type binary RZ Comae Berenicis".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57.6(2005):977-982.
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