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Orbital period changes of contact binary systems: direct evidence for thermal relaxation oscillation theory
Qian SB(钱声帮)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2001-12-11
Volume328Issue:3Pages:914-924
DOI10.1046/j.1365-8711.2001.04921.x
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Stars : Evolution Stars : Fundamental Parameters Stars : Oscillations
AbstractOrbital period changes of ten contact binary systems (S Ant, epsilon CrA, EF Dra, UZ Leo, XZ Leo, TY Men, V566 Oph, TY Pup, RZ Tau and AG Vir) are studied based on the analysis of their O-C curves. It is discovered that the periods of the six systems, S Ant, epsilon CrA, EF Dra, XZ Leo, TY Men and TY Pup, show secular increases. For UZ Leo, its secular period increase rate is revised. For the three systems, V566 Oph, R.Z Tau and AG Vir, weak evidence is presented that a periodic oscillation (with periods of 20.4, 28.5 and 40.9 yr respectively) is superimposed on a secular period increase. The cyclic period changes can be explained by the presence of an unseen third body in the three systems. All the sample stars studied are contact binaries with M-1 greater than or equal to 1.35 M. Furthermore, orbital period changes of 27 hot contact binaries have been checked. It is found that, apart from AW UMa with the lowest mass ratio (q = 0.072), none shows an orbital period decrease. The relatively weak magnetic activity in the hotter contact binaries means little angular momentum loss (AML) from the systems via magnetic stellar winds. The period increases of these W UMa binaries can be explained by mass transfer from the secondary to the primary components, which is in agreement with the prediction of the thermal relaxation oscillation (TRO) models. This suggests that the evolution of a hotter W UMa star is mainly controlled by TRO. On the other hand, for a cooler W UMa star (M-1 less than or equal to 1.35 M.), its evolution may be TRO plus AML, which coincides with the recent results of Qian.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeReview
ISSN0035-8711
URL查看原文
Archive Date2002-01-07
WOS IDWOS:000172925600025
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordW-URSAE-MAJORIS ; V566 OPHIUCHI ; LIGHT CURVES ; RADIAL-VELOCITY ; UZ LEONIS ; STARS ; UMA ; EVOLUTION
Citation statistics
Cited Times:74[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5745
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
2.National Astronomical Observatories, Chinese Academy of Sciences (NAOCAS)
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC)
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Qian, SB . Orbital period changes of contact binary systems: direct evidence for thermal relaxation oscillation theory[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2001,328(3):914-924.
APA Qian SB,&Qian, SB .(2001).Orbital period changes of contact binary systems: direct evidence for thermal relaxation oscillation theory.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,328(3),914-924.
MLA Qian SB,et al."Orbital period changes of contact binary systems: direct evidence for thermal relaxation oscillation theory".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 328.3(2001):914-924.
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