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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
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2017-07-01
Volume362Issue:6Pages:109-116
DOI10.1007/s10509-017-3091-2
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Eclipsing Binaries: Cataclysmic Variables Stars: Individual (Ex Dra)
Abstract

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.

Funding ProjectChinese Natural Science Foundation[11325315] ; Chinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11573063] ; Chinese Natural Science Foundation[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]
Funding OrganizationChinese 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]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherSPRINGER
Publication PlaceVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN0004-640X
URL查看原文
Archive Date2017-06-28
WOS IDWOS:000404219200004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS Keyword2ND-GENERATION PLANET FORMATION ; DISC FRAGMENTATION ; CLOSE BINARIES ; NN SERPENTIS ; HU AQR ; RS CVN ; DRACONIS ; THERMODYNAMICS ; DECREASE ; SYSTEMS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/10144
Collection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
Corresponding AuthorHan ZT(韩忠涛)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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.(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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