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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
Source PublicationASTRONOMICAL JOURNAL
2015-01
Volume149Issue:1
DOI10.1088/0004-6256/149/1/4
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Stars: Individual (Dw Psc) Stars: Variables: Delta Scuti Techniques: Photometric
Abstract

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.

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
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2015-01-05
WOS IDWOS:000347308300004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordOVERCONTACT BINARY-SYSTEMS ; SHALLOW CONTACT ; TIDAL FRICTION ; PERIOD ; LEONIS ; DEEP
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5924
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 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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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