A cool stellar companion to the delta Scuti variable star GW UMa
文献类型：期刊论文
| 作者 | Wang SM(王树民); Qian SB(钱声帮); Li LJ(李临甲); Zhu LY(朱俐颖); Zhao EG(赵二刚); Zhou X(周肖); Li LJ(李临甲) ; Qian SB(钱声帮); Wang SM(王树民); Zhao EG(赵二刚)
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| 刊名 | NEW ASTRONOMY
 |
| 出版日期 | 2015-01 |
| 卷号 | 34页码:11-14 |
| 关键词 | Stars: variable: delta Scuti Stars: binary: close Stars: individual (GW UMa) Techniques: photometry |
| ISSN号 | 1384-1076 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | GW UMa is a new high-amplitude delta Scuti variable star with a period of 0(d).20319367. By using a few new determined times of light maximum together with those collected from the literature, the changes in Observed-Calculated (O-C) diagram were analyzed. It is discovered that the O-C curve of GW UMa shows a cyclic variation with a period of 13.2 years and a semi-amplitude of 0.0023 days. The periodic variation was analyzed for the light-travel time effect that may be due to the presence of a stellar companion. The mass of the stellar companion is determined to be M-2 sin i = 0.11(+/- 0.01) M-circle dot when a mass of 1.76 M-circle dot for GW UMa is adopted. The two component stars in the binary system are orbiting each other at an orbital separation about 6.5(+/- 0.8) AU. For orbital inclinations i >= 22.6 degrees, the mass of the companion star would be M-2 < 0.3 M-circle dot and it is a fully convective star. The detection suggests that hidden stellar companions to bright stars may be not unusual. (C) 2014 Elsevier B.V. All rights reserved. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 收录类别 | SCI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S138410761400075X |
| 语种 | 英语 |
| WOS记录号 | WOS:000342530900003 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5926]  |
| 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 | Qian SB(钱声帮) |
| 推荐引用方式 GB/T 7714 | Wang SM,Qian SB,Li LJ,et al. A cool stellar companion to the delta Scuti variable star GW UMa[J]. NEW ASTRONOMY,2015,34:11-14. |
| APA | 王树民.,钱声帮.,李临甲.,朱俐颖.,赵二刚.,...&Zhu LY.(2015).A cool stellar companion to the delta Scuti variable star GW UMa.NEW ASTRONOMY,34,11-14. |
| MLA | 王树民,et al."A cool stellar companion to the delta Scuti variable star GW UMa".NEW ASTRONOMY 34(2015):11-14. |
入库方式： OAI收割
来源：云南天文台
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