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CSS J154915.7+375506: a low-mass-ratio marginal contact binary system with a hierarchical third body

文献类型：期刊论文

作者Wu JF(伍劲锋)2,3,4; Zhu LY(朱俐颖)2,3,4; Matekova, Zizbek1,3,4; Li LJ(李临甲)2,3; Ehgamberdiev, Shuhrat1,5; Asfandiyarov, Ildar1; Wang JJ(王江娇)2,3,4; Zhang J(张嘉)2,3; Meng FB(孟芳斌)2,3,4
刊名Monthly Notices of the Royal Astronomical Society
出版日期2024-04-01
卷号529期号:4页码:3113-3120
ISSN号0035-8711
关键词binaries: close binaries: eclipsing stars: evolution stars: individual: CSS J154915.7+375506
DOI10.1093/mnras/stae590
产权排序第1完成单位
文献子类Journal article (JA)
英文摘要We presented the multifilter light curves of CSS J154915.7+375506 inaugurally, which were observed by the 1.5-m Astronomicheskiy Zerkalniy Telescope 22 (AZT-22) telescope at Maidanak Astronomical Observatory. A low-resolution spectrum obtained by Large-sky-Area Multi-Object fiber Spectroscopic Telescope reveals that it is an A-type (spectral A type) close binary. By analysing the BVRI total-eclipse light curves, we are able to derive a reliable photometric solution for this system, which indicates that CSS J154915.7+375506 is an extremely low mass ratio (q = 0.138) marginal contact binary system. The location in the Hertzsprung–Russell (HR) diagram shows that its secondary component with a much smaller mass is the more evolved one, indicating that the mass ratio reversal occurred. The present secondary component had transferred a significant amount of mass to the present primary one. By the combination of a total of 20 times of minimum, we investigated its O–C (observed minus calculated) curve. A periodic oscillation and a possible period decrease have been detected. As the period decreases, the system will evolve towards the contact phase. This makes CSS J154915.7+375506 a valuable case to study the formation scenario of contact binaries through mass reversal. The periodic oscillation suggested a third body with a minimal mass of 0.91 M☉, which is larger than that of the less massive component in the central binary. This implies that the secondary body was not replaced by the third body during early stellar interactions, indicating that it is a fossil system and retains its original dynamical information. © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
学科主题天文学
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资助项目N/A
语种英语
资助机构N/A
源URL[http://ir.ynao.ac.cn/handle/114a53/26753]  
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.Ulugh Beg Astronomical Institute, the Uzbekistan Academy of Science, Astronomicheskaya 33, Tashkent, 100052, Uzbekistan;
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650216, China;
3.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming, 650216, China;
4.University of Chinese Academy of Sciences, No.1 Yanqihu East Rd, Huairou District, Beijing, 101408, China;
5.Department of Astronomy and Astrophysics, National University of Uzbekistan, 4 University str., Tashkent, 100174, Uzbekistan
推荐引用方式
GB/T 7714		 Wu JF,Zhu LY,Matekova, Zizbek,et al. CSS J154915.7+375506: a low-mass-ratio marginal contact binary system with a hierarchical third body[J]. Monthly Notices of the Royal Astronomical Society,2024,529(4):3113-3120.
APA 伍劲锋.,朱俐颖.,Matekova, Zizbek.,李临甲.,Ehgamberdiev, Shuhrat.,...&孟芳斌.(2024).CSS J154915.7+375506: a low-mass-ratio marginal contact binary system with a hierarchical third body.Monthly Notices of the Royal Astronomical Society,529(4),3113-3120.
MLA 伍劲锋,et al."CSS J154915.7+375506: a low-mass-ratio marginal contact binary system with a hierarchical third body".Monthly Notices of the Royal Astronomical Society 529.4(2024):3113-3120.

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来源：云南天文台

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