Photometric Study of Two Totally Eclipsing Contact Binaries: V789 Her and V1007 Cas
Li, K.1,2; Xia, Q. -Q.1; Hu, S. -M.1; Guo, D. -F.1; Chen, X.1; Li, K., Email: kaili@sdu.edu.cn; Chen, X., Email: chenxu@sdu.edu.cn
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2018-07-01
卷号130期号:989
DOI10.1088/1538-3873/aac067
收录类别SCI
关键词Binaries: Eclipsing Binaries (Including Multiple): Close Stars: Individual (V789 Her V1007 Cas)
摘要Two sets of V and R-c light curves of V789 Her and one complete set of BVRcIc light curves of V1007 Cas were observed and presented. By analyzing all these light curves together with the Sloan g('i') light curves observed by Kjurkchieva et al., we determined that both systems are W-subtype contact binaries and that V789 Her is a medium contact system, while V1007 Cas is a shallow contact system. Because the two binaries show totally eclipsing primary minima, the photometric results are reliable. In addition, the light curves of the two systems are asymmetric, requiring a dark spot on the primary or the secondary component in the modeling. By compiling all available times of minimum light including literatures, SuperWASP archive and ours, we analyzed the orbital period variations. We derived that the O-C diagram of V789 Her displays a periodic oscillation whose period and amplitude are 29.2 years and 0.0179 days and the period of V1007 Cas exhibits a continuous decrease at dP/dt. = -1.78(+/- 0.09) x 10(-7) days yr(-1). The cyclic period modulation of V789 Her is probably attributed to the light travel time effect via a tertiary companion with very small mass. The continuous period decrease of V1007 Cas may result from the mass transfer between the two components. However, we cannot rule out the possibility of angular momentum loss because V1007 Cas shows strong magnetic activity. By analyzing the evolutionary status of the components of the two systems, we determined that they exhibit typical characteristics of other W-subtype contact binaries.
项目资助者Chinese Natural Science Foundation(11703016) ; National Natural Science Foundation of China (NSFC)(U1431105) ; Chinese Academy of Sciences (CAS)(U1431105) ; Natural Science Foundation of Shandong Province(ZR2014AQ019, ZR2017PA009) ; Young Scholars Program of Shandong University, Weihai(2016WHWLJH07) ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects(OP201704)
语种英语
学科领域天文学
文章类型Article
ISSN0004-6280
URL查看原文
WOS记录号WOS:000432439900001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SHORT-PERIOD BINARIES ; VELOCITY CURVES ; CLOSE BINARIES ; URSAE-MAJORIS ; LIGHT CURVES ; STAR LIGHT ; EVOLUTION ; MECHANISM ; SYSTEMS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12388
专题中国科学院天体结构与演化重点实验室
通讯作者Li, K., Email: kaili@sdu.edu.cn; Chen, X., Email: chenxu@sdu.edu.cn
作者单位1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, People's Republic of China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, People's Republic of China
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Li, K.,Xia, Q. -Q.,Hu, S. -M.,et al. Photometric Study of Two Totally Eclipsing Contact Binaries: V789 Her and V1007 Cas[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2018,130(989).
APA Li, K..,Xia, Q. -Q..,Hu, S. -M..,Guo, D. -F..,Chen, X..,...&Chen, X., Email: chenxu@sdu.edu.cn.(2018).Photometric Study of Two Totally Eclipsing Contact Binaries: V789 Her and V1007 Cas.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,130(989).
MLA Li, K.,et al."Photometric Study of Two Totally Eclipsing Contact Binaries: V789 Her and V1007 Cas".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 130.989(2018).
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