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WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum
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)
发表期刊NEW ASTRONOMY
2017-10-01
卷号56页码:22-27
DOI10.1016/j.newast.2017.04.006
产权排序第1完成单位
收录类别SCI
关键词Binaries Eclipsing - Binaries Evolution - Stars Cataclysmic Variables - Stars Period Bouncer - Stars Individual (Wz Sge)
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.
项目资助者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)
语种英语
学科领域天文学
文章类型Article
ISSN1384-1076
URL查看原文
归档日期2017-06-28
WOS记录号WOS:000404504300005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DWARF NOVA ; BROWN DWARF ; EVOLUTION ; SAGITTAE ; BINARY ; STARS ; DONOR ; GAP
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/10145
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
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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.
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