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Orbital period studies of the two contact binaries TZ Bootis and Y Sextantis
Qian SB(钱声帮)1,2,3; Liu QY(刘清耀)1,2,3; Qian, S
Source PublicationASTRONOMY & ASTROPHYSICS
2000-03
Volume355Issue:1Pages:171-175
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars : Binaries : Close Stars : Individual : Tz Boo Stars : Late-type Stars : Magnetic Fields Stars : Individual : y Sex
AbstractThe physical properties of the two A-type contact binaries TZ Boo and Y Sex are nearly the same. In the present paper, many of their published times of light minima are collected and the changes in their orbital periods are analyzed. It is indicated that the orbital period of TZ Boo shows several alternating jumps while it undergoes a secular decrease of -11.8 x 10(-8) days/year. Several random jumps superposed on a secular decrease (-5.5 x 10(-8) days/year) are also found in the period of Y Sex. The secular decrease is usually interpreted as mass transfer from the more to the less massive components, or mass and angular momentum loss (AML) from the systems. According to the AML theory, on the contact stage, the orbital AML is mainly caused by the mass transfer from the less to the more massive component and the mass ratio decreasing and orbital period gradually increasing are the corresponding results. The extremely low mass ratio and orbital angular momentum of the two systems show that they are evolved via AML and the present secular decrease in the periods may suggest that the magnetic activity in the two systems are very strong. The relation between the changes of the orbital periods and the magnetic activity in the two systems are discussed. We think that the interplay between the variable AML and variable magnetic coupling can explain both the jumps and secular decrease in the orbital periods of the two systems.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6361
URL查看原文
Archive Date2000-12-31
WOS IDWOS:000086458500023
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordANGULAR-MOMENTUM LOSS ; W-UMA SYSTEMS ; STARS ; EVOLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5741
Collection双星与变星研究组
Corresponding AuthorQian, S
Affiliation1.Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China
2.National Astronomical Observatories, Chinese Academy of Science (NAOCAS)
3.United Laboratory of Optical Astronomy, Chinese Academy of Science (ULOAC)
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Liu QY,Qian, S. Orbital period studies of the two contact binaries TZ Bootis and Y Sextantis[J]. ASTRONOMY & ASTROPHYSICS,2000,355(1):171-175.
APA Qian SB,Liu QY,&Qian, S.(2000).Orbital period studies of the two contact binaries TZ Bootis and Y Sextantis.ASTRONOMY & ASTROPHYSICS,355(1),171-175.
MLA Qian SB,et al."Orbital period studies of the two contact binaries TZ Bootis and Y Sextantis".ASTRONOMY & ASTROPHYSICS 355.1(2000):171-175.
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