UY Ursae Majoris: A W-subtype WUMa system with a small mass ratio

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	UY Ursae Majoris: A W-subtype WUMa system with a small mass ratio
	Yang YL(杨毓兰)1,2,3 ; Liu QY(刘清耀)1,2,3 ; Leung, KC 4
刊名	ASTRONOMY & ASTROPHYSICS
	2001-05
卷号	370 期号:2 页码:507-512
关键词	stars : binaries starspots stars : variables : general
ISSN号	0004-6361
通讯作者	Yang, Y (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming, Yunnan Province, Peoples R China.
产权排序	第一完成单位
英文摘要	We present light curves and photometric solutions of the contact binary UY UMa in this paper. The light curves appear to exhibit a typical O'Connell effect, with Maximum I being 0.034 mag(V) and 0.030 mag(B) brighter than Maximum IS, respectively, and Maximum I shifting to phase 0.26. The light curves are analyzed by means of the latest version of the WD program. The results show that UY Uh la is a W-subtype contact binary with a small mass ratio q = 0.134. The asymmetry of the light curves is explained by star spot models. From the collected data of 9 UMa contact systems with a smaller mass ratio than 0.20. the nature of the secondaries is analyzed. The results show that the luminosities and densities of the secondaries could be controlled by the primaries and that the smaller the mass ratio; the stronger the control.
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]	BINARY STARS ; CONTACT
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2001/17/aa10454/aa10454.html
语种	英语
WOS记录号	WOS:000168611400020
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4128]
专题	云南天文台_其他
作者单位	1.Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan Province, PR China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, PR China 3.National Astronomical Observatories, Chinese Academy of Sciences, PR China 4.Department of Physics and Astronomy, University of Nebraska, Lincoln, USA
推荐引用方式 GB/T 7714	Yang YL,Liu QY,Leung, KC. UY Ursae Majoris: A W-subtype WUMa system with a small mass ratio[J]. ASTRONOMY & ASTROPHYSICS,2001,370(2):507-512.
APA	Yang YL,Liu QY,&Leung, KC.(2001).UY Ursae Majoris: A W-subtype WUMa system with a small mass ratio.ASTRONOMY & ASTROPHYSICS,370(2),507-512.
MLA	Yang YL,et al."UY Ursae Majoris: A W-subtype WUMa system with a small mass ratio".ASTRONOMY & ASTROPHYSICS 370.2(2001):507-512.