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A Possible Explanation of W-type Phenomena in V694 Peg

文献类型：期刊论文

作者Xu, Hu-Shan4; Zhu LY(朱俐颖)1,2,3
刊名ASTROPHYSICAL JOURNAL
出版日期2024-11-01
卷号975期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ad7eb2
产权排序第2完成单位
文献子类Article
英文摘要Three sets of complete multicolor light curves of V694 Peg observed in 2013, 2015, and 2019 were presented and analyzed. Our photometric solutions show that this system was an A-type shallow contact binary in 2013 and 2015 while it converted to a W-type one in 2019. A large cool spot on the component of this binary could explain the conversion, implying the W-type phenomena may be caused by the magnetic activity of the components. We have collected available data on this binary and calculated 505 times of light minimum, which spans 17 yr. The orbital period investigation based on these timings shows there is a long-term period increase at a rate of dP/dt = 4.3(+/- 0.3)x10-9 day yr-1 superposed on a periodic variation with a period of 11.81(+/- 0.06) yr. The cyclic orbital variation may be the result of magnetic activity cycles or the existence of a third body. Until now, only eight transformed systems, including V694 Peg, have been reported. Compared with other converting contact systems between A-type and W-type, V694 Peg is recorded as the shortest-period one. All of these converting systems are late-type (later than F7) contact binaries with the O'Connell effect and show cyclic period variation, which indicates that magnetic activity may be the reason for the conversion between the two types of contact binaries. For investigating the nature of A-type and W-type phenomena, the discovery of more converting contact binaries is essential.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词CLOSE BINARY STARS ; URSAE-MAJORIS SYSTEMS ; ABSOLUTE-MAGNITUDE CALIBRATION ; SHALLOW-CONTACT BINARY ; RADIAL-VELOCITY ; LIGHT CURVES ; ECLIPSING BINARY ; PERIOD CHANGES ; ORBITAL PERIOD ; COMPONENTS
资助项目Science Foundation of Yunnan Province[202401AS070046]; Yunnan Fundamental Research Projects[202401CF070039]; Chinese Academy of Sciences (CAS) Interdisciplinary Innovation Team
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001348993700001
出版者IOP Publishing Ltd
资助机构Science Foundation of Yunnan Province[202401AS070046] ; Yunnan Fundamental Research Projects[202401CF070039] ; Chinese Academy of Sciences (CAS) Interdisciplinary Innovation Team
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27676]  
专题云南天文台_双星与变星研究组
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.Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing City, People's Republic of China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, P.O. Box 110, 650216, People's Republic of China;
3.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming, P.O. Box 110, 650216, People's Republic of China;
4.Physics Department, Yuxi Normal University, Yuxi 653100, People's Republic of China;
推荐引用方式
GB/T 7714		 Xu, Hu-Shan,Zhu LY. A Possible Explanation of W-type Phenomena in V694 Peg[J]. ASTROPHYSICAL JOURNAL,2024,975(2).
APA Xu, Hu-Shan,&朱俐颖.(2024).A Possible Explanation of W-type Phenomena in V694 Peg.ASTROPHYSICAL JOURNAL,975(2).
MLA Xu, Hu-Shan,et al."A Possible Explanation of W-type Phenomena in V694 Peg".ASTROPHYSICAL JOURNAL 975.2(2024).

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来源：云南天文台

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