Magnetic activity and orbital period variation of the eclipsing binary KV Gem

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	Magnetic activity and orbital period variation of the eclipsing binary KV Gem
	Zhang, Liyun1,2 ; Pi, Qingfeng 1,2; Yang, Yuangui3 ; Li, Zhongmu4
刊名	NEW ASTRONOMY
	2014-02
卷号	27 页码:81-94
关键词	Stars Contact - binaries Eclipsing - stars Individual IN Gem - stars Period variation
ISSN号	1384-1076
通讯作者	Zhang, LY (reprint author), Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China.
英文摘要	This paper presents new CCD BVRI light curves of a neglected eclipsing binary IN Gem. Our new light curves were obtained in 2010 and 2011 at the Xinglong station of the National Astronomical Observatories, China. By analyzing all available light minimum times, we derived an update ephemeris and found there existed a cyclic variation overlaying a continuous period decrease. This kind of cyclic variation may probably be attributed to the light-time effect via the presence of an unseen third body or magnetic activity cycle. The long-term period decrease suggests that KV Gem is undergoing a mass transfer from the secondary component to the primary component at a rate of 3.4(0.3) x (10(-7) M-circle dot/year for period decrease and a third body (10.3 +/- 0.2 years), and 5.5(0.6) x 10(-7) M-circle dot/year for decrease and magnetic cycle (8.8 +/- 0.1 years). By analyzing the light curves in 2011, photometric solutions and starspots parameters of the system are obtained using Wilson-Devinney program. Based on the photometric solution in 2011, we still could use the spot model to explain successfully our light curves in 2010 and three published light curves. Comparing the starspot longitudes and factors, KV Gem are variable on a long time scale of about years. For the data of KV Gem, the brightness vary with time around phases 0, 0.25, 0.5, and 0.75, which means that there is a possible photospheric active evolution. More data are needed to monitor to detect stellar cycle of KV Gem. For chromospheric activity of KV Gem, We found strong absorption in the observed H-beta, H-gamma), and Ca II H & K spectra, and no obvious emission. (C) 2013 Elsevier B.V. All rights reserved.
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]	SKY AUTOMATED SURVEY ; MARGINAL-CONTACT BINARY ; RS CANUM-VENATICORUM ; VARIABLE-STARS ; CLOSE BINARIES ; H-ALPHA ; ADDITIONAL COMPONENTS ; PHOTOMETRIC ANALYSIS ; SOUTHERN-HEMISPHERE ; RT ANDROMEDAE
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1384107613000961
语种	英语
WOS记录号	WOS:000327169400011
公开日期	2016-06-01
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9447]
专题	云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.College of Science/Department of Physics & NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China 3.School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, PR China 4.Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, PR China
推荐引用方式 GB/T 7714	Zhang, Liyun,Pi, Qingfeng,Yang, Yuangui,et al. Magnetic activity and orbital period variation of the eclipsing binary KV Gem[J]. NEW ASTRONOMY,2014,27:81-94.
APA	Zhang, Liyun,Pi, Qingfeng,Yang, Yuangui,&Li, Zhongmu.(2014).Magnetic activity and orbital period variation of the eclipsing binary KV Gem.NEW ASTRONOMY,27,81-94.
MLA	Zhang, Liyun,et al."Magnetic activity and orbital period variation of the eclipsing binary KV Gem".NEW ASTRONOMY 27(2014):81-94.