| A cool stellar companion to the delta Scuti variable star GW UMa | |
Wang SM(王树民)1,2,3 ; Qian SB(钱声帮)1,2,3; Li LJ(李临甲)1,2,3; Zhu LY(朱俐颖)1,2,3; Zhao EG(赵二刚)1,2,3; Zhou X(周肖)1,2,3
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| 发表期刊 | NEW ASTRONOMY
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| 2015-01 | |
| 卷号 | 34页码:11-14 |
| DOI | 10.1016/j.newast.2014.05.003 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Stars: Variable: Delta Scuti Stars: Binary: Close Stars: Individual (Gw Uma) Techniques: Photometry |
| 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. |
| 资助项目 | Chinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11325315] |
| 项目资助者 | Chinese Natural Science Foundation[11133007, 11325315] |
| 语种 | 英语 |
| 学科领域 | 天文学 ; 恒星与银河系 ; 恒星天文学 |
| 文章类型 | Article |
| 出版者 | ELSEVIER SCIENCE BV |
| 出版地 | PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS |
| ISSN | 1384-1076 |
| URL | 查看原文 |
| 归档日期 | 2014-06-09 |
| WOS记录号 | WOS:000342530900003 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5926 |
| 专题 | 双星与变星研究组 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) |
| 作者单位 | 1.Yunnan Astronomical Observatory, Chinese Academy of Sciences, P. O. Box 110, 650011 Kunming, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China 3.University of the Chinese Academy of Sciences, Beijing 100049, China |
| 第一作者单位 | 中国科学院云南天文台 |
| 通讯作者单位 | 中国科学院云南天文台 |
| 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 | Wang SM,Qian SB,Li LJ,Zhu LY,Zhao EG,&Zhou X.(2015).A cool stellar companion to the delta Scuti variable star GW UMa.NEW ASTRONOMY,34,11-14. |
| MLA | Wang SM,et al."A cool stellar companion to the delta Scuti variable star GW UMa".NEW ASTRONOMY 34(2015):11-14. |
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| A cool stellar compa（738KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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