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A new mechanism of long-term period variations for WU Ma-type contact binaries
Liu L(刘亮)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Xiong X(熊逍)1,2,3,4; Liu, L.(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-03-01
卷号474期号:4页码:5199-5205
DOI10.1093/mnras/stx3138
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Stars: Evolution Stars: Kinematics And Dynamics
摘要W UMa-type contact binaries belong to close binary systems whose components exactly overflow their Roche lobes and share a common convective envelope (CCE). In the last twenty years, the long-term variations of their orbital periods have been thought to depend on several mechanisms. Now, we suggest a new mechanism: CCE-dominated mechanism. The CCE-dominated mechanism is found based on our numerical result, especially at high mass ratios, that the orbital periods (P) of contact binaries change very much with their fill-out factors (f). Because f is taken as a measurement of the thickness of CCE, the physical cause for the variation of P is a mass transfer between CCE and components. Further, an f-dominated simplification model for this mechanism is introduced. According to it, P may change in a long-term oscillation way with a similar time scale of the thermal modulation, meanwhile q is decreasing slowly till the two components merge. It could be also applied to explain the presence of extremely short period, high mass ratio and deep contact binaries. Moreover, the CCE-dominated mechanism should always work due to mass transfer and mass loss both occurring via CCE. Therefor, the effect of CCE on the variations of orbital periods may have been underestimated before.
项目资助者Yunnan Natural Science Foundation(2016FB004) ; young academic and technology leaders project of Yunnan Province(2015HB098) ; Chinese Natural Science Foundation(11773066, 11403095, 11325315) ; Key Research Programme of the Chinese Academy of Sciences(KGZD-EW-603)
语种英语
学科领域天文学
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000424977800068
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ANGULAR-MOMENTUM LOSS ; THERMAL RELAXATION OSCILLATION ; URSAE MAJORIS SYSTEMS ; LIGHT-CURVE PARADOX ; CLOSE BINARIES ; ECLIPSING BINARIES ; EVOLUTION ; STARS ; MODULATION ; COMPONENTS
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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/114a53/12129
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Liu, L.(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P. R. China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P. R. China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, P. R. China
4.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
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Liu L,Qian SB,Xiong X,et al. A new mechanism of long-term period variations for WU Ma-type contact binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,474(4):5199-5205.
APA Liu L,Qian SB,Xiong X,&Liu, L..(2018).A new mechanism of long-term period variations for WU Ma-type contact binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,474(4),5199-5205.
MLA Liu L,et al."A new mechanism of long-term period variations for WU Ma-type contact binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 474.4(2018):5199-5205.
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