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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
Source PublicationNEW ASTRONOMY
2015-01
Volume34Pages:11-14
DOI10.1016/j.newast.2014.05.003
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Variable: Delta Scuti Stars: Binary: Close Stars: Individual (Gw Uma) Techniques: Photometry
Abstract

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.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11325315]
Funding OrganizationChinese Natural Science Foundation[11133007, 11325315]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherELSEVIER SCIENCE BV
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1076
URL查看原文
Archive Date2014-06-09
WOS IDWOS:000342530900003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5926
Collection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
Corresponding AuthorQian SB(钱声帮)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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