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Photometric study and period variation investigation of the WUMa-type binary EQUMa

文献类型：期刊论文

作者Hu, Shao Ming1; Li, Kai1,2; Guo, D. -F.1; Jiang, Yunguo1; Gao, Dongyang1; Chen, Xu1; Li, K (reprint author), Shandong Univ, Shandong Prov Key Lab Optic Astron & Solar Terr E, Inst Space Sci, Weihai 264209, Peoples R China.
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
出版日期2015-10
卷号37期号:5
关键词Binaries: Close Binaries: Eclipsing Stars: Individual (Eq Uma)
ISSN号0004-6264
DOI10.1093/pasj/psv069
文献子类Article
英文摘要Four-color light curves of EQ UMa were obtained with the 1.0 m telescope at Weihai Observatory, Shandong University. The light variability of EQ UMa is typical of a W UMa-type binary. By analyzing the four-color light curves simultaneously, we found that EQ UMa is a semi-detached binary with the less massive component filling its inner Roche lobe. The very short period and the Algol-type configuration make EQ UMa a very good target to challenge the formation and evolution theory of low-mass Algols. We investigated the orbital period change of EQ UMa by all available times of minimum light. It is shown that the orbital period of EQ UMa displays a cyclic oscillation with a period of 12.1 yr super-imposed on long-term increase with a rate of dp/dt = 1.77 x 10(-7) dyr(-1). The long-term period increase should be caused by themass transfer from the less massive component to the more massive one. The cyclic modulation is very probably produced by the light travel time effect of a third component.
学科主题Astronomy & Astrophysics
URL标识查看原文
WOS关键词URSAE MAJORIS SYSTEMS ; CONTACT BINARY ; LIGHT CURVES ; STAR ; EVOLUTION
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000362834000022
资助机构National Natural Science Foundation of China(11203016,11333002,U1431105) ; Natural Science Foundation of Shandong Province(ZR2012AQ008,ZR2014AQ019) ; Key Laboratory for the Structure and Evolution of Celestial Objects(OP201303)
源URL[http://ir.ynao.ac.cn/handle/114a53/9383]  
专题云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Li, K (reprint author), Shandong Univ, Shandong Prov Key Lab Optic Astron & Solar Terr E, Inst Space Sci, Weihai 264209, Peoples R China.
作者单位1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences
推荐引用方式
GB/T 7714		 Hu, Shao Ming,Li, Kai,Guo, D. -F.,et al. Photometric study and period variation investigation of the WUMa-type binary EQUMa[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2015,37(5).
APA Hu, Shao Ming.,Li, Kai.,Guo, D. -F..,Jiang, Yunguo.,Gao, Dongyang.,...&Li, K .(2015).Photometric study and period variation investigation of the WUMa-type binary EQUMa.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,37(5).
MLA Hu, Shao Ming,et al."Photometric study and period variation investigation of the WUMa-type binary EQUMa".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 37.5(2015).

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