RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?

	RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?
	Qian SB(钱声帮)1,2 ; He JJ(何家佳)1,2 ; Xiang, FY3
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2008
卷号	60 期号:1 页码:77-83
关键词	stars : binaries : close stars : binaries : eclipsing stars : individual (RT Leonis Minoris)
ISSN号	0004-6264
通讯作者	Qian, SB (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	New photometric observations and analyses of the W UMa-type binary system RT Leonis Minoris are presented. A period study with our four times of light minimum, including other eclipse times from the literature, suggests that the orbital period of the binary star is variable. The O - C curve can be explained as a cyclic variation with an amplitude of 0.(d)0049 and a period of 46.7 yr. Photometric solutions were derived by using the 2003 version of the Wilson-Devinney method (1971, ApJ, 166, 605), and absolute parameters of the system were determined. The results indicate that RT LMi is an ambiguous W UMa-type overcontact system for the following reasons: (i) the depths of both minima are nearly equal, which makes it very difficult to distinguish whether it belongs to an A- or W-type system; (ii) the primary minima in Hoffmann's light curves are an occultation, indicating a W-type system, while the primary minimum in our light curve is a transit, suggesting an A-type light variation; and (iii) though our light curve shows an A-type variation, the photometric solutions indicate a higher secondary temperature of T-2 = 6513 K (T-1 = 6400 K), making the binary system, surprisingly, of W-type. These may indicate that Binnendijk's classification based on the shape of the light curve cannot reveal the physical properties of W UMa-type binary stars of this kind.
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 ; URSAE-MAJORIS SYSTEM ; LIGHT VARIATION ; CLOSE BINARIES ; STARS ; DEEP ; M67
收录类别	SCI
原文出处	http://pasj.oxfordjournals.org/content/60/1/77
语种	英语
WOS记录号	WOS:000255818000008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5814]
专题	云南天文台_双星与变星研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, P. R. China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), Beijing 100012, P. R. China 3.Department of Physics, Xiangtan University, Xiangtan 411105, Funan Province, P. R. China
推荐引用方式 GB/T 7714	Qian SB,He JJ,Xiang, FY. RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2008,60(1):77-83.
APA	Qian SB,He JJ,&Xiang, FY.(2008).RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,60(1),77-83.
MLA	Qian SB,et al."RT Leonis Minoris: Does it belong to an A- or W-Type overcontact binary system?".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 60.1(2008):77-83.