THE FIRST PHOTOMETRIC INVESTIGATION OF THE NEGLECTED W-UMa-TYPE BINARY STAR UZ CMi
文献类型：期刊论文
| 作者 | Qian, S. -B.1,2,3; Li, K.1,2,3 ; Liao, W. -P.1,2; Liu, L.1,2,3; Zhu, L. -Y.1,2; He, J. -J.1,2; Wang, J. -J.1,2,3; Zhao, E. -G.1,2
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2013-04-01 |
| 卷号 | 145期号:4 |
| 关键词 | binaries: close binaries: eclipsing stars: evolution stars: individual (UZ UMi) |
| 英文摘要 | UZ CMi was a W-UMa-type binary star found more than 80 years ago. However, it has been neglected in photometric investigations. Here, the first complete light curves in the B, V, R, and I bands are presented and analyzed using the Wilson and Devinney method. It is discovered that UZ CMi is a contact binary (f = 38.4(+/- 2.3)%) with amass ratio of 0.45. The derived orbital inclination (i = 87 degrees) indicates that it is a total eclipsing binary, which suggests that the determined parameters are reliable. By using 17 new eclipse times together with those collected from the literature, we found that the general trend of the observed-calculated (O - C) curve shows an upward parabolic variation that corresponds to a long-term increase in the orbital period at a rate of (P) over dot = +4.1 x 10(-8) days yr(-1). The continuous increase may be caused by a mass transfer from the less massive component to the more massive one. This suggests that UZ CMi is in the thermal relaxation oscillation controlled stage of the evolutionary scheme proposed by Qian. UZ CMi will oscillate around a critical mass ratio and the contact configuration cannot be broken. After the upward parabolic change was removed, the (O - C)(2) curve of the photoelectric and charge-coupled device data revealed a cyclic variation with a small amplitude of 0.0026 days and a period of 21.1 yr. The cyclic change was analyzed for the light-travel time effect via the presence of an extremely cool stellar companion. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000316247300005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5945]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, 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 |
| 推荐引用方式 GB/T 7714 | Qian, S. -B.,Li, K.,Liao, W. -P.,et al. THE FIRST PHOTOMETRIC INVESTIGATION OF THE NEGLECTED W-UMa-TYPE BINARY STAR UZ CMi[J]. ASTRONOMICAL JOURNAL,2013,145(4). |
| APA | Qian, S. -B..,Li, K..,Liao, W. -P..,Liu, L..,Zhu, L. -Y..,...&Zhao, E. -G..(2013).THE FIRST PHOTOMETRIC INVESTIGATION OF THE NEGLECTED W-UMa-TYPE BINARY STAR UZ CMi.ASTRONOMICAL JOURNAL,145(4). |
| MLA | Qian, S. -B.,et al."THE FIRST PHOTOMETRIC INVESTIGATION OF THE NEGLECTED W-UMa-TYPE BINARY STAR UZ CMi".ASTRONOMICAL JOURNAL 145.4(2013). |
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来源：国家天文台
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