An extremely low mass ratio contact binary NW Aps with a potential compact companion star
文献类型：期刊论文
| 作者 | Zhou X(周肖)1,2,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2025-08 |
| 卷号 | 541期号:4页码:3401-3411 |
| 关键词 | binaries: eclipsing stars: evolution stars: fundamental parameters stars: individuals (NW Aps) |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/staf1170 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | The photometric solutions of NW Aps reveal that it is a low mass ratio (q=0.086) contact binary system. Investigation of orbital period shows that its orbital period is increasing continuously at a rate of dP/dt = +1.117(+/- 0.005) x 10(-6) dyr(-1) , which may be caused by mass transfer from the less massive component to the more massive one at a rate of dM(2)/dtv= - 3.36 (+/- 0.02) x 10(-8) M-circle dot yr(-1). A cyclic variation of P-3 = 22.9(+/- 0.1) is also found in the O-C curve. There may be a potential compact object orbiting around NW Aps, with its minimum mass to be M3 = 0.436 (+/- 0.007)M-circle dot. However, the magnetic activity of the primary star may also account for the cyclic change. NW Aps is a stellar merger candidate with the longest orbital period among all stellar merge candidates with mass ratio q < 0.1. It is still in a stable state since the ratio of orbital angular momentum (J(orb)) to spin angular momentum (J(spin)) is J(orb)/ J(spin) = 3.257. Both of its primary and secondary star are oversized to main sequence stars, and the surface gravity of the primary and secondary stars are significant lower than main sequence stars. The P-log g relationship is fitted with parabola for low mass ratio contact binary systems. More targets laid in the gap are needed to confirm the P-log g relationship and reveal the final evolutionary state of low mass ratio contact binary system. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
| WOS关键词 | I. ; EVOLUTION ; STABILITY ; CATALOG ; SYSTEMS ; DEEP |
| 资助项目 | Chinese Academy of Sciences[020GJHZ2023030GC]; International Partnership Program of Chinese Academy of Sciences; Young Talent Project of Yunnan Revitalization Talent Support Program[202401AW070004]; Young Talent Project of Yunnan Revitalization Talent Support Program[202503AP140013]; Young Talent Project of Yunnan Revitalization Talent Support Program[202401AS070046]; Yunnan Fundamental Research Projects[10.17909/t9-nmc8-f686]; NASA Explorer Program |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001542254100001 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Chinese Academy of Sciences[020GJHZ2023030GC] ; International Partnership Program of Chinese Academy of Sciences ; Young Talent Project of Yunnan Revitalization Talent Support Program[202401AW070004, 202503AP140013, 202401AS070046] ; Yunnan Fundamental Research Projects[10.17909/t9-nmc8-f686] ; NASA Explorer Program |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28502]  |
| 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 |
| 通讯作者 | Zhou X(周肖) |
| 作者单位 | 1.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650216 Kunming, China; 3.Yunnan Observatories, Chinese Academy of Sciences (CAS), PO Box 110, 650216 Kunming, China; |
| 推荐引用方式 GB/T 7714 | Zhou X. An extremely low mass ratio contact binary NW Aps with a potential compact companion star[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,541(4):3401-3411. |
| APA | 周肖.(2025).An extremely low mass ratio contact binary NW Aps with a potential compact companion star.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,541(4),3401-3411. |
| MLA | 周肖."An extremely low mass ratio contact binary NW Aps with a potential compact companion star".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 541.4(2025):3401-3411. |
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来源：云南天文台
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