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Deep, low mass ratio overcontact binary systems. III. CU Tauri and TV Muscae
Qian SB(钱声帮)1,2,3; Yang YG(杨远贵)1,2; Soonthornthum, B4; Zhu LY(朱俐颖)1,2; He JJ(何家佳)1,2; Yuan JZ(袁金照)1,2; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (Cu Tauri Tv Muscae)
AbstractNew CCD photometric light curves in the B and V bands of the neglected W UMa - type eclipsing variable star CU Tauri are presented. The O'Connell effect in the V light curve obtained in 2001 by Yang and Liu was about Delta V = +0.015, but it vanished in our 2004 observations. The variations in the levels of bothminima were seen. Our two epochs of light minimum and others compiled from the literature were used for the period study. It is shown that the types of some eclipse times were incorrect and the values of the period obtained by previous investigators were aliases that prevented formation of a plausible O - C curve. A new linear ephemeris was derived, and it is discovered that the orbital period of CU Tau shows a continuous decrease at a rate of dP/dt = - 1.81 x 10(-6) days yr(-1). The present symmetric light curves were solved with the 2003 version of the Wilson-Devinney (W-D) code. Both our solutions and those derived by Yang and Liu reveal that CU Tau is a deep ( f = 50.1% +/- 3.2%), low mass ratio (q = 0.1770 +/- 0.0017) overcontact binary system. Meanwhile, the photoelectric light curves in the B, V, R, and I bands of TV Muscae published by Hilditch and coworkers were reanalyzed with the 2003 version of the W-D code. It is shown that the low mass ratio binary turns out to be a deep overcontact system with f = 74.3% +/- 11.3%. A period analysis with all collected times of light minimum revealed a combination of a long-term period decrease (dP/dt = - 2.16 x 10(-7) days yr(-1)) and a possible cyclic change with a period of 29.1 yr. The rapid long-term period decreases of both systems can be explained as a combination of the mass transfer from the more massive component to the less massive one and the angular momentum loss due to mass outflow from the L2 point. In that way, the overcontact degrees of the two systems will become deeper as their periods decrease, and finally they will evolve into a single rapid-rotation star. However, for CU Tau, the rate of the secular period decrease is very large when compared with the other systems of the same type. This suggests that the long-term period decrease may be part of a long-period periodic change, which we need more data to check.
Subject AreaAstronomy & Astrophysics
Archive Date2005-06-21
WOS IDWOS:000230085900020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
Citation statistics
Cited Times:48[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China
3.Visiting Astronomer, Astrophysics Research Institute, Liverpool John Moores University
4.Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Yang YG,Soonthornthum, B,et al. Deep, low mass ratio overcontact binary systems. III. CU Tauri and TV Muscae[J]. ASTRONOMICAL JOURNAL,2005,130(1):224-233.
APA Qian SB.,Yang YG.,Soonthornthum, B.,Zhu LY.,He JJ.,...&Qian, SB .(2005).Deep, low mass ratio overcontact binary systems. III. CU Tauri and TV Muscae.ASTRONOMICAL JOURNAL,130(1),224-233.
MLA Qian SB,et al."Deep, low mass ratio overcontact binary systems. III. CU Tauri and TV Muscae".ASTRONOMICAL JOURNAL 130.1(2005):224-233.
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