Spectroscopic and Decade-long Photometric Observations of the Contact Binary V2790 Ori: Evidence for a Brown Dwarf Companion and a Solar-like Magnetic Activity Cycle
文献类型：期刊论文
| 作者 | Wang, Si-Rui2; Li, Kai2; Xia, Qi-Qi2; Gao, Dong-Yang2; Gao, Xiang2; Wang, Jing-Yi2; Guo, Ya-Ni2; Gao, Xing1; Sun, Guo-You3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-02-01 |
| 卷号 | 997期号:2页码:289 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae27cd |
| 产权排序 | 2 |
| 英文摘要 | We present 22 sets of light curves and one radial velocity curve for the W UMa-type total eclipse contact binary system V2790 Ori, derived by combining all available public photometric data, the photometric data in previous studies, and our own spectroscopic and decade-long photometric observations. Our simultaneous analysis of the light curves and radial velocity curve shows that V2790 Ori is a W-subtype contact binary with a mass ratio of q = 0.322(+/- 0.001) and a shallow contact degree of 14.8(+/- 0.6)%. The orbital period analysis based on 445 eclipsing minima reveals a secular decrease at a rate of P=-3.18(+/- 0.75)x10-8daysyr-1 , superimposed with a cyclic variation with an amplitude of A = 8.98(+/- 2.19) x 10-4 days and a period of P3 = 7.44(+/- 0.52) yr. The secular decrease is caused by angular momentum loss via magnetic braking, while the cyclic period variation is explained by the light-travel time effect due to a third body, which is likely to be a brown dwarf. Furthermore, our analysis indicates a mass transfer from the more massive component to the less massive one at a rate of 1.22(+/- 0.29) x 10-8 M circle dot yr-1. A model with a cool spot on each component was adopted to fit the O'Connell effect observed in the light curves. Since the O'Connell effect varies over time, we identified a solar-like magnetic activity cycle with a period of approximately 5.4 yr by analyzing the magnitude difference (Delta m) at the two light maxima and the O'Connell effect ratio. In addition, evolutionary analysis suggests that V2790 Ori is a newly formed contact binary that evolved from a detached phase into the present contact configuration. |
| WOS关键词 | ORBITAL PERIOD MODULATION ; LOW-MASS ; LIGHT CURVES ; ECLIPSING BINARIES ; ANGULAR-MOMENTUM ; UMA ; EVOLUTION ; STARS ; RATIO ; EXPLANATION |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[12273018] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001672998800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8517]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Li, Kai |
| 作者单位 | 1.Xinjiang Astron Observ, 150 Sci 1-St, Urumqi 830011, Peoples R China 2.Shandong Univ, Inst Space Sci, Sch Space Sci & Technol, Shandong Key Lab Space Environm & Explorat Technol, Shandong, Peoples R China 3.Xingming Observ, Urumqi, Xinjiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Si-Rui,Li, Kai,Xia, Qi-Qi,et al. Spectroscopic and Decade-long Photometric Observations of the Contact Binary V2790 Ori: Evidence for a Brown Dwarf Companion and a Solar-like Magnetic Activity Cycle[J]. ASTROPHYSICAL JOURNAL,2026,997(2):289. |
| APA | Wang, Si-Rui.,Li, Kai.,Xia, Qi-Qi.,Gao, Dong-Yang.,Gao, Xiang.,...&Sun, Guo-You.(2026).Spectroscopic and Decade-long Photometric Observations of the Contact Binary V2790 Ori: Evidence for a Brown Dwarf Companion and a Solar-like Magnetic Activity Cycle.ASTROPHYSICAL JOURNAL,997(2),289. |
| MLA | Wang, Si-Rui,et al."Spectroscopic and Decade-long Photometric Observations of the Contact Binary V2790 Ori: Evidence for a Brown Dwarf Companion and a Solar-like Magnetic Activity Cycle".ASTROPHYSICAL JOURNAL 997.2(2026):289. |
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