A CLOSE HIDDEN STELLAR COMPANION TO THE SX Phe-TYPE VARIABLE STAR DW Psc
文献类型：期刊论文
| 作者 | 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)
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2015-01 |
| 卷号 | 149期号:1 |
| ISSN号 | 0004-6256 |
| 关键词 | binaries: close stars: individual (DW Psc) stars: variables: delta Scuti techniques: photometric |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | 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. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | OVERCONTACT BINARY-SYSTEMS ; SHALLOW CONTACT ; TIDAL FRICTION ; PERIOD ; LEONIS ; DEEP |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-6256/149/1/4/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000347308300004 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5924]  |
| 专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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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来源：云南天文台
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