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Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra
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, Zhong-tao(Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China)
发表期刊ASTROPHYSICS AND SPACE SCIENCE
2017-07-01
卷号362期号:6页码:109-116
DOI10.1007/s10509-017-3091-2
产权排序第1完成单位
收录类别SCI
关键词Binaries: Eclipsing Binaries: Cataclysmic Variables Stars: Individual (Ex Dra)
摘要EX Dra is a long-period eclipsing dwarf nova with similar to 2-3 mag amplitude outbursts. This star has been monitored photometrically from November, 2009 to March, 2016 and 29 new mid-eclipse times were obtained. By using new data together with the published data, the best fit to the O - C curve indicate that the orbital period of EX Dra have an upward parabolic change while undergoing double-cyclic variations with the periods of 21.4 and 3.99 years, respectively. The upward parabolic change reveals a longterm increase at a rate of (P)over dot = +7.46 x 10(-11) s s(-1). The evolutionary theory of cataclysmic variables (CVs) predicts that, as a CV evolves, the orbital period should be decreasing rather than increasing. Secular increase can be explained as the mass transfer between the secondary and primary or may be just an observed part of a longer cyclic change. Most plausible explanation for the double-cyclic variations is a pair of light travel-time effect via the presence of two companions. Their masses are determined to be M-A sin i(A)' = 29.3(+/- 0.6) M (Jup) and M (B) sin i(B)' = 50.8(+/- 0.2) M-Jup. When the two companions are coplanar to the orbital plane of the central eclipsing pair, their masses would match to brown dwarfs.
项目资助者Chinese Natural Science Foundation(11325315, 11133007, 11573063, 11611530685) ; 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
ISSN0004-640X
URL查看原文
归档日期2017-06-28
WOS记录号WOS:000404219200004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]2ND-GENERATION PLANET FORMATION ; DISC FRAGMENTATION ; CLOSE BINARIES ; NN SERPENTIS ; HU AQR ; RS CVN ; DRACONIS ; THERMODYNAMICS ; DECREASE ; SYSTEMS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/10144
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, Zhong-tao(Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China)
作者单位1.Yunnan ObservatoriesChinese Academy of Sciences (CAS)KunmingChina
2.Key Laboratory of the Structure and Evolution of Celestial ObjectsChinese Academy of SciencesKunmingChina
3.University of Chinese Academy of SciencesBeijingChina
4.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia
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Han ZT,Qian SB,Voloshina, Irina,et al. Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra[J]. ASTROPHYSICS AND SPACE SCIENCE,2017,362(6):109-116.
APA Han ZT,Qian SB,Voloshina, Irina,Zhu LY,&Han, Zhong-tao.(2017).Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra.ASTROPHYSICS AND SPACE SCIENCE,362(6),109-116.
MLA Han ZT,et al."Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra".ASTROPHYSICS AND SPACE SCIENCE 362.6(2017):109-116.
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