WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum
文献类型：期刊论文
| 作者 | Han ZT(韩忠涛)1,2,3 ; Qian SB(钱声帮)1,2,3; Voloshina, Irina4; Zhu LY(朱俐颖)1,2,3; Han, Z. -T.(Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China)
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| 刊名 | NEW ASTRONOMY
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| 出版日期 | 2017-10-01 |
| 卷号 | 56页码:22-27 |
| 关键词 | Binaries Eclipsing - Binaries Evolution - Stars Cataclysmic Variables - Stars Period Bouncer - Stars Individual (Wz Sge) |
| ISSN号 | 1384-1076 |
| DOI | 10.1016/j.newast.2017.04.006 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present the photometric results of the eclipsing cataclysmic variable (CV) WZ Sge near the period minimum (P-min). Eight new mid-eclipse times were determined and the orbital ephemeris was updated. Our result shows that the orbital period of WZ Sge is decreasing at a rate of (P) over dot = -2.72(+/- 0.23) x 10(-13) ss(-1). This secular decrease, coupled with previous detection of its donor, suggest that WZ Sge is a pre-bounce system. Further analysis indicates that the observed period decrease rate is about 1.53 times higher than pure gravitational radiation (GR) driving. We constructed the evolutionary track of WZ Sge, which predicts that P-min of WZ Sge is similar to 77.98(+/- 0.90) min. If the orbital period decreases at the current rate, WZ Sge will evolve past its Pmin after similar to 253 Myr. Based on the period evolution equation we find (M) over dot(2) similar or equal to 4.04(+/- 0.10) x 10(-11)M(circle dot)yr(-1), which is compatible with the current concept of CV evolution at ultrashort orbital periods. (C) 2017 Elsevier B.V. All rights reserved. |
| 学科主题 | 天文学 |
| URL标识 | 查看原文 |
| WOS关键词 | DWARF NOVA ; BROWN DWARF ; EVOLUTION ; SAGITTAE ; BINARY ; STARS ; DONOR ; GAP |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000404504300005 |
| 资助机构 | Chinese Natural Science Foundation(11325315, 11611530685, 11573063, 11133007) ; Strategic Priority Research Program "The Emergence of Cosmological Structure" of the Chinese Academy of Sciences(XDB09010202) ; Science Foundation of Yunnan Province(2012HC011) ; Russian Foundation for Basic Research(17-52-53200) |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/10145]  |
| 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 |
| 通讯作者 | Han, Z. -T.(Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China) |
| 作者单位 | 1.Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P. O. Box 110, 650216 Kunming, China 3.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China 4.Sternberg Astronomical Institute, Moscow State University, Universitetskij prospect 13, Moscow 119992, Russia |
| 推荐引用方式 GB/T 7714 | Han ZT,Qian SB,Voloshina, Irina,et al. WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum[J]. NEW ASTRONOMY,2017,56:22-27. |
| APA | Han ZT,Qian SB,Voloshina, Irina,Zhu LY,&Han, Z. -T..(2017).WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum.NEW ASTRONOMY,56,22-27. |
| MLA | Han ZT,et al."WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum".NEW ASTRONOMY 56(2017):22-27. |
入库方式： OAI收割
来源：云南天文台
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