HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. X. THE NEWLY DISCOVERED BINARY XY LEONIS MINORIS

	HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. X. THE NEWLY DISCOVERED BINARY XY LEONIS MINORIS
	Qian SB(钱声帮)1,2,3 ; Liu L(刘亮)1,2,3 ; Zhu LY(朱俐颖)1,2,3 ; He JJ(何家佳)1,2,3 ; Yang, YG4 ; Bernasconi, L 5
刊名	ASTRONOMICAL JOURNAL
	2011-05
卷号	141 期号:5
关键词	binaries: close binaries: eclipsing stars: evolution stars: individual (XY LMi)
ISSN号	0004-6256
通讯作者	Qian, SB (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	The newly discovered short-period close binary star, XY LMi, has been monitored photometrically since 2006. Its light curves are typical EW-type light curves and show complete eclipses with durations of about 80 minutes. Photometric solutions were determined through an analysis of the complete B, V, R, and I light curves using the 2003 version of the Wilson-Devinney code. XY LMi is a high fill-out, extreme mass ratio overcontact binary system with a mass ratio of q = 0.148 and a fill-out factor of f = 74.1%, suggesting that it is in the late evolutionary stage of late-type tidal-locked binary stars. As observed in other overcontact binary stars, evidence for the presence of two dark spots on both components is given. Based on our 19 epochs of eclipse times, we found that the orbital period of the overcontact binary is decreasing continuously at a rate of dP/dt = -1.67 x 10(-7) days yr(-1), which may be caused by mass transfer from the primary to the secondary and/or angular momentum loss via magnetic stellar wind. The decrease of the orbital period may result in the increase of the fill-out, and finally, it will evolve into a single rapid-rotation star when the fluid surface reaches the outer critical Roche lobe.
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]	CONTACT BINARIES ; LIGHT CURVES ; ADDITIONAL COMPONENTS ; STAR LIGHT ; DEEP
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-6256/141/5/151/meta
语种	英语
WOS记录号	WOS:000289240800010
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5857]
专题	云南天文台_双星与变星研究组
作者单位	1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China 3.Graduate School of the CAS, 100049 Beijing, China 4.School of Physics and Electric Information, Huaibei Coal Industry Teachers College, 235000 Huaibei, Anhui Province, China 5.Les Engarouines Observatory, F-84570 Malemort-du-Comtat, France
推荐引用方式 GB/T 7714	Qian SB,Liu L,Zhu LY,et al. HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. X. THE NEWLY DISCOVERED BINARY XY LEONIS MINORIS[J]. ASTRONOMICAL JOURNAL,2011,141(5).
APA	Qian SB,Liu L,Zhu LY,He JJ,Yang, YG,&Bernasconi, L.(2011).HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. X. THE NEWLY DISCOVERED BINARY XY LEONIS MINORIS.ASTRONOMICAL JOURNAL,141(5).
MLA	Qian SB,et al."HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. X. THE NEWLY DISCOVERED BINARY XY LEONIS MINORIS".ASTRONOMICAL JOURNAL 141.5(2011).