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Cyclic Period Oscillation of the Eclipsing Dwarf Nova DV UMa
Han ZT(韩忠涛)1,2,3; Qian SB(钱声帮)1,2,3; Irina, Voloshina4; 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ASTRONOMICAL JOURNAL
2017-05-01
卷号153期号:5页码:238-245
DOI10.3847/1538-3881/aa6c2a
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Dwarf Novae Stars: Individual (Dv Uma)
摘要DV UMa is an eclipsing dwarf nova with an orbital period of similar to 2.06 hr, which lies just at the bottom edge of the period gap. To detect its orbital period changes, we present 12 new mid-eclipse times by using our CCD photometric data and archival data. The latest version of the O-C diagram, combined with the published mid-eclipse times in quiescence, and spanning similar to 30 years, was obtained and analyzed. The best fit to those available eclipse timings shows that the orbital period of DV UMa is undergoing a cyclic oscillation with a period of 17.58(+/- 0.52) years and an amplitude of 71.1(+/- 6.7) s. The periodic variation most likely arises from the light-travel-time effect via the presence of a circumbinary object, because the required energy to drive the Applegate mechanism is too high in this system. The mass of the unseen companion was derived as M-3 sin i' = 0.025(+/- 0.004) M.. If the third body is in the orbital plane (i.e., i' = i = 82 degrees.9) of the eclipsing pair, this would indicate it is a brown dwarf. This hypothetical brown dwarf is orbiting its host star at a separation of similar to 8.6 au in an eccentric orbit (e. = 0.44).
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
ISSN0004-6256
URL查看原文
归档日期2017-06-15
WOS记录号WOS:000400895900001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]BROWN-DWARF ; ORBITAL PERIOD ; CATACLYSMIC VARIABLES ; WHITE-DWARF ; URSAE-MAJORIS ; NN SERPENTIS ; UZ FORNACIS ; PG 0134+070 ; HU AQR ; COMPANION
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被引频次:4[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/114a53/10178
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.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, 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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Han ZT,Qian SB,Irina, Voloshina,et al. Cyclic Period Oscillation of the Eclipsing Dwarf Nova DV UMa[J]. ASTRONOMICAL JOURNAL,2017,153(5):238-245.
APA Han ZT,Qian SB,Irina, Voloshina,Zhu LY,&Han, Z. -T.(2017).Cyclic Period Oscillation of the Eclipsing Dwarf Nova DV UMa.ASTRONOMICAL JOURNAL,153(5),238-245.
MLA Han ZT,et al."Cyclic Period Oscillation of the Eclipsing Dwarf Nova DV UMa".ASTRONOMICAL JOURNAL 153.5(2017):238-245.
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