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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-03-01
Volume474Issue:4Pages:5199-5205
DOI10.1093/mnras/stx3138
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Stars: Evolution Stars: Kinematics And Dynamics
Abstract

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.

Funding ProjectYunnan Natural Science Foundation[2016FB004] ; young academic and technology leaders project of Yunnan Province[2015HB098] ; Chinese Natural Science Foundation[11773066] ; Chinese Natural Science Foundation[11403095] ; Chinese Natural Science Foundation[11325315] ; Key Research Programme of the Chinese Academy of Sciences[KGZD-EW-603]
Funding OrganizationYunnan 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]
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
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000424977800068
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordANGULAR-MOMENTUM LOSS ; THERMAL RELAXATION OSCILLATION ; URSAE MAJORIS SYSTEMS ; LIGHT-CURVE PARADOX ; CLOSE BINARIES ; ECLIPSING BINARIES ; EVOLUTION ; STARS ; MODULATION ; COMPONENTS
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12129
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 AuthorLiu L(刘亮)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu L,Qian SB,Xiong X. 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.(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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