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Orbital period studies of three algols: TW And, RW Leo, and AY Vul
Qian, SB
2003
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN0004-6264
Volume55Issue:1Pages:289-295
AbstractThe changes in the orbital periods of three EA-type eclipsing binaries, TW And, RW Leo, and AY Vul, are discussed based on an analysis of their 0 - C curves. For RW Leo, its orbital period was revised and, assuming a cyclic oscillation in the orbital period, a period of 38.4 yr was determined. For the other two systems, TW And and AY Vul, their 0 - C diagrams show complex variations. Under the assumption of periodic oscillation, cyclic changes with periods of 56.4 and 78.6 yr were discovered to superimpose on upward parabolic changes, indicating a secular period increase. The secular period increases for the two binary systems indicate that they are on an active phase of mass transfer. Assuming the oscillations in the periods to be caused by light-time effects due to the presence of "third bodies" rotating around these binary stars, the orbital parameters of the third bodies were determined. For RW Leo, it is possible to detect an additional third body photometrically and spectroscopically. However, for the other two systems, TW And and AY Vul, it is less likely to see additional bodies, unless the orbital inclination is very small (i.e., i' < 30degrees). New photometric and spectroscopic observations and a careful analysis of those data are needed to check the presence of third bodies.
Keywordstars : binaries : close stars : individuals (TW And, RW Leo AY Vul) stars : triple systems
WOS KeywordBINARIES ; CYGNI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000181441500023
PublisherASTRONOMICAL SOC JAPAN
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37437
Collection中国科学院国家天文台
Corresponding AuthorQian, SB
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China
2.Chinese Acad Sci, United Lab Opt Astron, ULOAC, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Qian, SB. Orbital period studies of three algols: TW And, RW Leo, and AY Vul[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2003,55(1):289-295.
APA Qian, SB.(2003).Orbital period studies of three algols: TW And, RW Leo, and AY Vul.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,55(1),289-295.
MLA Qian, SB."Orbital period studies of three algols: TW And, RW Leo, and AY Vul".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 55.1(2003):289-295.
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