PHOTOMETRIC AND PERIOD INVESTIGATION OF THE LATE F-TYPE OVERCONTACT BINARY II UMa
文献类型：期刊论文
| 作者 | Zhou X(周肖)1,2,3 ; Qian SB(钱声帮)1,2,3; Zhang J(张嘉)1,2; Zhang B(张斌)1,2,3; Kreiner, J.4
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2016-03-01 |
| 卷号 | 151期号:3 |
| ISSN号 | 0004-6256 |
| 关键词 | binaries: close binaries: eclipsing stars: evolution stars: individual (II UMa) |
| 通讯作者 | Zhou, X (reprint author) |
| 产权排序 | 第一完成单位 |
| 英文摘要 | II UMa is a late F-type (F5) contact binary with a close-in tertiary and a distant visual companion. According to the four-color (BVRcIc) light curves' solutions of II UMa, it is a high fill-out (f = 86.6%) and low-mass ratio (q = 0.172) contact binary system, which indicates that it is at the late evolutionary stage of late-type tidal-locked binary stars. The masses of the primary star and secondary star are calculated to be M-1 = 1.99M(circle dot) and M-2 = 0.34M(circle dot). The primary star has evolved from the zero-age main sequence, but it still appeared before the terminal-age main sequence, and the secondary star is even more evolved. Considering the mass ratio (M-3/M-1 = 0.67) obtained by spectroscopic observations, the mass of the close-in tertiary is estimated to be M-3 = 1.34M(circle dot). The period variations of the binary system are investigated for the first time. According to the observed-calculated (O-C) curve analysis, a continuous period increase at a rate of dP/dt = 4.88 x 10(-7) day yr(-1) is determined. The parabolic variation in the O-C curve may be part of a cyclic period of change, or the combined period of change of a parabolic variation and a cyclic one. More instances of minimum light are needed to confirm this. The presence of the tertiary component may play an important role in the formation and evolution of this binary system by drawing angular momentum from the central system during the pre-contact stage. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR LIGHT CURVES ; CONTACT BINARIES ; VELOCITY CURVES ; PARAMETERS |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.3847/0004-6256/151/3/67/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000371249100019 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9352]  |
| 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 |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650216 Kunming, China 3.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China 4.Mt. Suhora Astronomical Observatory, Pedagogical University of Cracow, Poland |
| 推荐引用方式 GB/T 7714 | Zhou X,Qian SB,Zhang J,et al. PHOTOMETRIC AND PERIOD INVESTIGATION OF THE LATE F-TYPE OVERCONTACT BINARY II UMa[J]. ASTRONOMICAL JOURNAL,2016,151(3). |
| APA | Zhou X,Qian SB,Zhang J,Zhang B,&Kreiner, J..(2016).PHOTOMETRIC AND PERIOD INVESTIGATION OF THE LATE F-TYPE OVERCONTACT BINARY II UMa.ASTRONOMICAL JOURNAL,151(3). |
| MLA | Zhou X,et al."PHOTOMETRIC AND PERIOD INVESTIGATION OF THE LATE F-TYPE OVERCONTACT BINARY II UMa".ASTRONOMICAL JOURNAL 151.3(2016). |
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来源：云南天文台
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