RZ Tauri: An unstable W Ursae Majoris binary with a magnetically active component

doi:10.1086/377019

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	RZ Tauri: An unstable W Ursae Majoris binary with a magnetically active component
	Yang YL(杨毓兰)1,2 ; Liu QY(刘清耀)1,2 ; Yang, YL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊	ASTRONOMICAL JOURNAL
	2003-10
卷号	126 期号:4 页码:1960-1966
DOI	10.1086/377019
产权排序	第1完成单位
收录类别	SCI
关键词	Stars : Activity Stars : Binaries : Close Stars : Individual (Rz Tauri) Stars : Spots
摘要	New BV light curves and photometric solutions for the W Ursae Majoris binary RZ Tauri (spectral type F0) are presented. The light curves appear to exhibit a typical O'Connell effect, with primary maximum being 0.023 mag (V) and 0.030 mag (B) brighter than secondary maximum. From the present times of minimum light and those collected from the literature, the changes in the orbital period of the system are analyzed. The results suggest that the orbital period of RZ Tau continuously increases at a rate of dp/p = 1.10 x 10(-10) and that a short-term wavelike variation with an amplitude of DeltaP = 3.8 x 10(-6) days and a period of P-mod = 60 yr are superposed on the secular increase. The orbital period increase may be explained by mass transfer from the less massive to the more massive component at a rate of Deltam/Deltat = 8.81 x 10(-8) M.yr(-1), and the short-term oscillations may be due to magnetic activity on the secondary component. The present light curves and the radial velocity curves obtained by Struve et al. in 1950 were analyzed by means of the latest version of the Wilson-Devinney code. The results suggest that RZ Tau is an A-subtype W UMa contact binary with a mass ratio of 0.379. The asymmetry of the light curves may be explained by a cool spot on the secondary component. The basic parameters of the system are be found to be M-1 = 1.70 +/- 0.16 M., M-2 = 0.64 +/- 0.06 M., R-1 = 1.56 +/- 0.07 R., R-2 = 1.04 +/- 0.05 R., L-1 = 6.19 +/- 0.61 L., and L-2 = 2.60 +/- 0.27 L..
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6256
URL	查看原文
归档日期	2004-02-19
WOS记录号	WOS:000185676200025
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD MODULATION ; CONTACT BINARY ; CLOSE BINARIES ; LIGHT CURVES ; STARS ; UMA ; ELEMENTS ; SYSTEMS ; CANCRI
引用统计	被引频次：17[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/114a53/4153
专题	其他
通讯作者	Yang, YL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位	1.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Yang YL,Liu QY,Yang, YL . RZ Tauri: An unstable W Ursae Majoris binary with a magnetically active component[J]. ASTRONOMICAL JOURNAL,2003,126(4):1960-1966.
APA	Yang YL,Liu QY,&Yang, YL .(2003).RZ Tauri: An unstable W Ursae Majoris binary with a magnetically active component.ASTRONOMICAL JOURNAL,126(4),1960-1966.
MLA	Yang YL,et al."RZ Tauri: An unstable W Ursae Majoris binary with a magnetically active component".ASTRONOMICAL JOURNAL 126.4(2003):1960-1966.

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