A Possible Explanation of W-type Phenomena in V694 Peg

doi:10.3847/1538-4357/ad7eb2

YNAO OpenIR > 双星与变星研究组

	A Possible Explanation of W-type Phenomena in V694 Peg
	Xu, Hu-Shan 1; Zhu LY(朱俐颖)2,3,4
发表期刊	ASTROPHYSICAL JOURNAL
	2024-11-01
卷号	975 期号:2
DOI	10.3847/1538-4357/ad7eb2
产权排序	第2完成单位
收录类别	SCI
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.
资助项目	Science Foundation of Yunnan Province[202401AS070046]; Yunnan Fundamental Research Projects[202401CF070039]; Chinese Academy of Sciences (CAS) Interdisciplinary Innovation Team
项目资助者	Science Foundation of Yunnan Province[202401AS070046] ; Yunnan Fundamental Research Projects[202401CF070039] ; Chinese Academy of Sciences (CAS) Interdisciplinary Innovation Team
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:001348993700001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	CLOSE BINARY STARS ; URSAE-MAJORIS SYSTEMS ; ABSOLUTE-MAGNITUDE CALIBRATION ; SHALLOW-CONTACT BINARY ; RADIAL-VELOCITY ; LIGHT CURVES ; ECLIPSING BINARY ; PERIOD CHANGES ; ORBITAL PERIOD ; COMPONENTS
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27676
专题	双星与变星研究组中国科学院天体结构与演化重点实验室
作者单位	1.Physics Department, Yuxi Normal University, Yuxi 653100, People's Republic of China; 2.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming, P.O. Box 110, 650216, People's Republic of China; 3.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; 4.Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing City, 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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