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A cool stellar companion to the delta Scuti variable star GW UMa
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); Qian, SB (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊NEW ASTRONOMY
2015-01
卷号34页码:11-14
DOI10.1016/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.
项目资助者Chinese Natural Science Foundation [11133007, 11325315]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
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
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
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
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Astron Observ, POB 110, Kunming 650011, Peoples R China.
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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.,...&Qian, SB .(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.
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