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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.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2001-12-11
卷号328期号:3页码:914-924
DOI10.1046/j.1365-8711.2001.04921.x
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Stars : Evolution Stars : Fundamental Parameters Stars : Oscillations
摘要Orbital 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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Review
ISSN0035-8711
URL查看原文
归档日期2002-01-07
WOS记录号WOS:000172925600025
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]W-URSAE-MAJORIS ; V566 OPHIUCHI ; LIGHT CURVES ; RADIAL-VELOCITY ; UZ LEONIS ; STARS ; UMA ; EVOLUTION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5745
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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)
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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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