Magnetic activity and orbital period variation of the eclipsing binary KV Gem
Zhang, Liyun1,2; Pi, Qingfeng1,2; Yang, Yuangui3; Li, Zhongmu4; Zhang, LY (reprint author), Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China.
发表期刊NEW ASTRONOMY
2014-02
卷号27页码:81-94
DOI10.1016/j.newast.2013.09.002
收录类别SCI
关键词Stars Contact - Binaries Eclipsing - Stars Individual In Gem - Stars Period Variation
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.
项目资助者GuiZhou University(2008036) ; GuiZhou natural Science Foundation(20092263) ; Joint Fund of Astronomy of the National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS)(10978010,U1231102,11203005,11263001) ; Open Project Program of the Key Laboratory of Optical Astronomy, NAOC, CAS
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
URL查看原文
WOS记录号WOS:000327169400011
WOS研究方向Astronomy & Astrophysics
WOS类目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
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9447
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, LY (reprint author), Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China.
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
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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,&Zhang, LY .(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.
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