CW Cas: A Solar-type Contact Binary System with an Unseen Third Companion in a Hierarchical Quadruple System
文献类型：期刊论文
| 作者 | Zizbek, Matekova7,8,9; Zhu LY(朱俐颖)1,7,8; Li LJ(李临甲)1,7; Meng FB(孟芳斌)1,7,8; Liu NP(刘念平)1,7; Qian, ShengBang4,5; Zhao EG(赵二刚)7,8; Kovalev, Mikhail1,6,7; Wang JJ(王江娇)7,8; Chen YF(陈禹飞)7,8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-03-01 |
| 卷号 | 999期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae3c9c |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present a comprehensive multiband photometric and spectroscopic study of the G-type binary CW Cas. Analysis of its double-lined spectroscopic radial velocity curves yields a reliable mass ratio of q = 1.88(9). By combining modeling of the radial velocity curves with BVRcIc and TESS light curves, we found that CW Cas is a W-subtype shallow contact binary with a fill-out factor of 15%. The components have masses of 0.98(6) M circle dot and 0.52(4) M circle dot, separated by 2.25(5) R circle dot. A notable asymmetry in the maxima of the light curves was detected and explained by a dark spot located on the surface of at least one component. Comparison of light curves from different years revealed that these dark spot activities exhibit cyclic variations with an approximate period of 349 days. Orbital period analysis via its O - C diagram spanning 125 yr shows a long-term decrease superimposed with a periodic oscillation caused by the light-travel time effect due to a third body. This tertiary component has an orbital period of P3 = 99.4(6) yr and a minimal mass of M3 = 0.91(1) M circle dot. The absence of detectable signatures for this massive object in either the spectroscopic or photometric datasets implies it should be a compact object. Furthermore, a visual companion was identified based on Gaia Data Release 3 astrometric data, suggesting that CW Cas is part of a hierarchical quadruple system. As such, CW Cas represents a valuable laboratory for probing a 2 + 1 + 1 hierarchical multiple system hosting a compact object. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | TESS INPUT CATALOG ; LIGHT CURVES ; ECLIPSING BINARY ; MESA ISOCHRONES ; ORBITAL PERIOD ; STARS ; ASTROPY ; UMA ; VELOCITIES ; COMPONENT |
| 资助项目 | International Cooperation projects of the National Key R D Program[2022YFF0127300]; International Partnership Program od the Chinese Academy of Sciences[020GJHZ2023030GC]; Investigation and observations of special LAMOST eclipsing binaries based on telescope in Uzbekistan and China[AL-5921122128] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001697533000001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | International Cooperation projects of the National Key R D Program[2022YFF0127300] ; International Partnership Program od the Chinese Academy of Sciences[020GJHZ2023030GC] ; Investigation and observations of special LAMOST eclipsing binaries based on telescope in Uzbekistan and China[AL-5921122128] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28992]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Zizbek, Matekova |
| 作者单位 | 1.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; 2.National Astronomical Research Institute of Thailand, 191 Siriphanich Building, Huay Kaew Road, Chiang Mai 50200, Thailand; 3.National University of Uzbekistan, 4 University Street, Tashkent 100174, Uzbekistan 4.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, People’s Republic of China; 5.Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, People’s Republic of China; 6.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People’s Republic of China; 7.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; azizbek.matekov@ynao.ac.cn, zhuly@ynao.ac.cn; 8.University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Huairou District, Beijing 101408, People’s Republic of China; 9.Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences, 33 Astronomicheskaya Street, Tashkent 100052, Uzbekistan; |
| 推荐引用方式 GB/T 7714 | Zizbek, Matekova,Zhu LY,Li LJ,et al. CW Cas: A Solar-type Contact Binary System with an Unseen Third Companion in a Hierarchical Quadruple System[J]. ASTROPHYSICAL JOURNAL,2026,999(1). |
| APA | Zizbek, Matekova.,朱俐颖.,李临甲.,孟芳斌.,刘念平.,...&Ehgamberdiev, Shuhrat.(2026).CW Cas: A Solar-type Contact Binary System with an Unseen Third Companion in a Hierarchical Quadruple System.ASTROPHYSICAL JOURNAL,999(1). |
| MLA | Zizbek, Matekova,et al."CW Cas: A Solar-type Contact Binary System with an Unseen Third Companion in a Hierarchical Quadruple System".ASTROPHYSICAL JOURNAL 999.1(2026). |
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来源：云南天文台
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