A photometric study of the contact binary EQ Tauri

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	A photometric study of the contact binary EQ Tauri
	Yang YL(杨毓兰)1,2 ; Liu QY(刘清耀)1,2
刊名	ASTRONOMICAL JOURNAL
	2002-12
卷号	124 期号:6 页码:3358-3363
关键词	binaries : eclipsing binaries : general stars : invidivudal (EQ Tauri) stars : spots
ISSN号	0004-6256
通讯作者	Yang, YL (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Light curves and photometric solutions for the contact binary EQ Tauri are presented. The light curves appear to exhibit a typical O'Connell effect, with primary maximum being 0.030 mag (V) and 0.032 mag (B) brighter than secondary maximum. From the present times of minimum light and those collected from the literature, changes in the orbital period of the system are analyzed. The results reveal that the orbital period of the system oscillates with a cycle of about 23 yr and an amplitude of 8.5 x 10(-7) days. The light curves and recent radial velocity curves from Rucinski et al. are analyzed simultaneously using the latest version of the Wilson-Devinney code. The results suggest that EQ Tau is a W Ursae Majoris contact binary of subtype A. The asymmetry of the light curves is explainable by starspot models. The cyclical period change can most probably be attributed to a magnetic activity cycle in the secondary component. The absolute dimensions of EQ Tau are found to be M-1 = 1.32(3) M-., M-2 = 0.59(2) M-., R-1 = 1.16(3) R-., R-2 = 0.82(3) R-., L-1 = 1.35(12) L-., L-2 = 0.64(6) L-., and A = 2.55(3) R-..
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD MODULATION ; CLOSE BINARIES ; STARS
收录类别	SCI
原文出处	http://iopscience.iop.org/1538-3881/124/6/3358/
语种	英语
WOS记录号	WOS:000179361700027
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4134]
专题	云南天文台_其他
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
推荐引用方式 GB/T 7714	Yang YL,Liu QY. A photometric study of the contact binary EQ Tauri[J]. ASTRONOMICAL JOURNAL,2002,124(6):3358-3363.
APA	Yang YL,&Liu QY.(2002).A photometric study of the contact binary EQ Tauri.ASTRONOMICAL JOURNAL,124(6),3358-3363.
MLA	Yang YL,et al."A photometric study of the contact binary EQ Tauri".ASTRONOMICAL JOURNAL 124.6(2002):3358-3363.