OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY
文献类型：期刊论文
| 作者 | Qian, S. -B.1,2,3; Wang, J. -J.1,2,3; Zhu, L. -Y.1,2,3; Snoonthornthum, B.4; Wang, L. -Z.5; Zhao, E. G.1,2; Zhou, X.1,2,3 ; Liao, W. -P.1,2; Liu, N. -P.1,2,3
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| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
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| 出版日期 | 2014-05-01 |
| 卷号 | 212期号:1 |
| 关键词 | binaries: close binaries: eclipsing stars: activity stars: evolution stars: individual (CSTAR 038663) |
| 英文摘要 | W UMa-type stars are contact systems where both cool components fill the critical Roche lobes and share a common convective envelope. Long and unbroken time-series photometry is expected to play an important role in their origin and activity. The newly discovered short-period W UMa-type star, CSTAR 038663, was monitored continuously by Chinese Small Telescope ARray (CSTAR) in Antarctica during the winters of 2008 and 2010. There were 15 optical flares recorded in the i band during the winter of 2010. This was the first time such flares were detected from a W UMa-type star. By analyzing the nearly unbroken photometric data from 2008, it is discovered that CSTAR 038663 is a W-type shallow contact binary system (f = 10.6(+/- 2.9)%) with a high mass ratio of q = 1.12(+/- 0.01), where the less massive component is slightly hotter than the more massive one. The asymmetric light curves are explained by the presence of a dark spot on the more massive component. Its temperature is about 800 K lower than the stellar photosphere and it covers 2.1% of the total photospheric surface. The lifetime of the dark spot is longer than 116 days. Using 725 eclipse times, we found that the observed-calculated (O-C) curve may show a cyclic variation that is explained by the presence of a close-in third body. Both the shallow contact configuration and the extremely high mass ratio suggest that CSTAR 038663 is presently evolving into a contact system with little mass transfer. The formation and evolution is driven by the loss of angular momentum via magnetic braking, and the close-in companion star is expected to play an important role, removing angular momentum from the central eclipsing binary. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339232600004 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6447]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China 2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Natl Astron Res Inst Thailand, Chiang Mai 50200, Thailand 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, S. -B.,Wang, J. -J.,Zhu, L. -Y.,et al. OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2014,212(1). |
| APA | Qian, S. -B..,Wang, J. -J..,Zhu, L. -Y..,Snoonthornthum, B..,Wang, L. -Z..,...&Liu, N. -P..(2014).OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,212(1). |
| MLA | Qian, S. -B.,et al."OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 212.1(2014). |
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来源：国家天文台
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