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A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc
Qian SB(钱声帮)1,2,3; Li LJ(李临甲)1,2,3; Wang SM(王树民)1,2,3; He JJ(何家佳)1,2; Zhou X(周肖)1,2,3; Jiang LQ(江林巧)1,2,3
发表期刊ASTRONOMICAL JOURNAL
2015-01
卷号149期号:1
DOI10.1088/0004-6256/149/1/4
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Stars: Individual (Dw Psc) Stars: Variables: Delta Scuti Techniques: Photometric
摘要

DW Psc is a high-amplitude SX Phe-type variable with a period of pulsation of 0.05875 days. Using a few newly determined times of maximum light together with those collected from the literature, the changes in the observed-calculated (O-C) diagram are analyzed. It is discovered that the O-C curve of DW Psc shows a cyclic variation with a period of 6.08 years and a semi-amplitude of 0.0066 days. The periodic variation is analyzed for the light travel time effect, which is due to the presence of a stellar companion (M-2 sin i similar to 0.45(+/- 0.03) M-circle dot). The two-component stars in the binary system are orbiting each other in an eccentric orbit (e +/- 0.4) at an orbital separation of about 2.7(+/- 0.3) AU. The detection of a close stellar companion to an SX Phe-type star supports the idea that SX Phe-type pulsating stars are blue stragglers that were formed from the merging of close binaries. The stellar companion has played an important role in the merging of the original binary by removing angular momentum from the central binary during early dynamical interaction or/and late dynamical evolution. After the more massive component in DW Psc evolves into a red giant, the cool close companion should help to remove the giant envelope via possible critical Roche-lobe overflow, and the system may be a progenitor of a cataclysmic variable. The detection of a close stellar companion to DW Psc makes it a very interesting system to study in the future.

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
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
归档日期2015-01-05
WOS记录号WOS:000347308300004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]OVERCONTACT BINARY-SYSTEMS ; SHALLOW CONTACT ; TIDAL FRICTION ; PERIOD ; LEONIS ; DEEP
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5924
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 Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China
2.Key Laboratory of the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
推荐引用方式
GB/T 7714
Qian SB,Li LJ,Wang SM,et al. A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc[J]. ASTRONOMICAL JOURNAL,2015,149(1).
APA Qian SB,Li LJ,Wang SM,He JJ,Zhou X,&Jiang LQ.(2015).A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc.ASTRONOMICAL JOURNAL,149(1).
MLA Qian SB,et al."A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc".ASTRONOMICAL JOURNAL 149.1(2015).
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