RT leonis minoris: an unstable W ursae majoris system with a spotted component

doi:10.1088/1009-9271/4/6/553

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	RT leonis minoris: an unstable W ursae majoris system with a spotted component
	Yang YL(杨毓兰)1,2 ; Liu QY(刘清耀)1,2 ; Yang, YL (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2004-12
卷号	4 期号:6 页码:553-562
DOI	10.1088/1009-9271/4/6/553
分类号	P152
产权排序	第1完成单位
收录类别	SCI
关键词	Star : Contact Binary Star : Individuals : Rt Lmi Star : Magnetic Activity
摘要	Complete BV light curves of the W UMa type binary RT LMi are presented. From the observations, four times of minimum light were determined. Based on the new times of minimum light and those collected from the literature, changes in the orbital period of the system were found and analyzed with Kalimeris et al.'s method. The result shows that the orbital period possibly oscillates with a cycle of about 64 years and an amplitude of 1.2 x 10(-6) days. The present CCD photometric observations reveal that the light curves are obviously asymmetrical, and show a positive O'Connell effect, while the light curves obtained in 1982 exhibit a negative O'Connell effect. The present light curves were analyzed by means of the latest version of the Wilson-Devinney code, which was also used to correct the photometric, effects, including the distortion on the radial-velocity curves obtained by Rucinski et al. The following absolute dimensions have been derived: M(1) = 1.28 +/- 0.08 M(circle dot), M(2) = 0.48 +/- 0.06 M(circle dot), R(1) = 1.28 +/- 0.06 R(circle dot), R(2) = 0.83 +/- 0.05 R(circle dot), L(1) = 1.88 +/- 0.12 L(circle dot), L(2) = 0.77 +/- 0.08 L(circle dot), and A = 2.64 +/- 0.02 R(circle dot). The asymmetry of the light curves can be explained by a model with a cool spot on the secondary component. The orbital period modulation can be reproduced by a magnetic activity cycle model of the secondary component with DeltaJ = 5.6 x 10(46) g cm(2) s(-1), DeltaOmega/Omega = 8.8 x 10(-4), and B = 5.1 x 10(3) G.
项目资助者	the National Natural Science Foundation of China.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	1009-9271
URL	查看原文
归档日期	2005-04-29
WOS记录号	WOS:000226863000006
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD MODULATION ; CLOSE BINARIES ; CONTACT BINARIES ; STARS
引用统计	被引频次：8[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/114a53/4172
专题	其他
通讯作者	Yang, YL (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 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 . RT leonis minoris: an unstable W ursae majoris system with a spotted component[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(6):553-562.
APA	Yang YL,Liu QY,&Yang, YL .(2004).RT leonis minoris: an unstable W ursae majoris system with a spotted component.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(6),553-562.
MLA	Yang YL,et al."RT leonis minoris: an unstable W ursae majoris system with a spotted component".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.6(2004):553-562.

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