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A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc
Qian SB(钱声帮); Li LJ(李临甲); Wang SM(王树民); He JJ(何家佳); Zhou X(周肖); Jiang LQ(江林巧); Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
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.
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
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
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
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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.,...&Qian, SB .(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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