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Period studies of some neglected close binaries: EP Andromedae, V724 Aquilae, SS Comae, AM Eridani, FZ Orionis, BY Pegasi, EQ Tauri, and NO Vulpeculae
Qian SB(钱声帮)1,2,3; Ma Y(马媛)1,2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Kunming 650011, Peoples R China.
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2001-06
Volume113Issue:784Pages:754-763
DOI10.1086/320808
Contribution Rank第1完成单位
Indexed BySCI
AbstractOrbital period changes of eight neglected short-period close binaries, EP And, V724 Aql, SS Com, AM Eri, FZ Ori, BY Peg, EQ Tau, and NO Vul, are presented based on the analysis of their O-C observations. It is found that the periods of BY Peg and EQ Tau are decreasing at rates of dP/dt = -1.67 x 10(-7) and -1.72 x 10(-7) day yr(-1), respectively, while the orbital periods of SS Com and AM Eri show secular increase at rates of dP/dt = +5.91 x 10(-7) and +4.39 x 10(-7) yr(-1). Weak evidence also indicates that the orbital period of EP And is increasing. for FZ Ori, the decrease rate of orbital period is revised. For the other two systems, V724 Aql adn NO Vul, their O-C curve can be described by a sudden period decrease or a continuous period decrease; further investigation is needed. The period changes of the eight systems can be explained by mass transfer between the two components and/or mass and angular momentum loss from these binaries. A strong mass-radius relation for observed contact binaries is formed based on the parameters given by Maceroni & Van't Veer. It is shown that the parameters of SS Com and EQ Tau given by Brancewicz & Dworak do not agree with the mass-radius relation. This may suggest that the two systems are not yet in contact. In order to understand the physical properties of these binaries, complete photoelectric or CCD light curves and radial velocity observations are needed.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6280
URL查看原文
Archive Date2001-10-10
WOS IDWOS:000169429000011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD ; CONTACT BINARIES ; LIGHT-CURVE ; Y-SEXTANTIS ; SYSTEM ; BOOTIS ; CYGNI
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5749
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, People’s Republic of China
2.National Astronomical Observatories, Chinese Academy of Sciences
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Ma Y,Qian, SB . Period studies of some neglected close binaries: EP Andromedae, V724 Aquilae, SS Comae, AM Eridani, FZ Orionis, BY Pegasi, EQ Tauri, and NO Vulpeculae[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2001,113(784):754-763.
APA Qian SB,Ma Y,&Qian, SB .(2001).Period studies of some neglected close binaries: EP Andromedae, V724 Aquilae, SS Comae, AM Eridani, FZ Orionis, BY Pegasi, EQ Tauri, and NO Vulpeculae.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,113(784),754-763.
MLA Qian SB,et al."Period studies of some neglected close binaries: EP Andromedae, V724 Aquilae, SS Comae, AM Eridani, FZ Orionis, BY Pegasi, EQ Tauri, and NO Vulpeculae".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 113.784(2001):754-763.
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