Double cyclic variations in orbital period of the eclipsing cataclysmic variable EX Dra
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, Zhong-tao(Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650216, Peoples R China)
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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
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| 出版日期 | 2017-07-01 |
| 卷号 | 362期号:6页码:109-116 |
| ISSN号 | 0004-640X |
| 关键词 | Binaries: Eclipsing Binaries: Cataclysmic Variables Stars: Individual (Ex Dra) |
| DOI | 10.1007/s10509-017-3091-2 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | 天文学 |
| URL标识 | 查看原文 |
| WOS关键词 | 2ND-GENERATION PLANET FORMATION ; DISC FRAGMENTATION ; CLOSE BINARIES ; NN SERPENTIS ; HU AQR ; RS CVN ; DRACONIS ; THERMODYNAMICS ; DECREASE ; SYSTEMS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000404219200004 |
| 资助机构 | 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) |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/10144]  |
| 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, 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 |
| 推荐引用方式 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,&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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来源：云南天文台
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