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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.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2001-06
卷号113期号:784页码:754-763
DOI10.1086/320808
产权排序第1完成单位
收录类别SCI
摘要Orbital 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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6280
URL查看原文
归档日期2001-10-10
WOS记录号WOS:000169429000011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD ; CONTACT BINARIES ; LIGHT-CURVE ; Y-SEXTANTIS ; SYSTEM ; BOOTIS ; CYGNI
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5749
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.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
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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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