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Light-Time Effect in the Early-Type Close Binary ZZ Cassiopeiae
Liao WP(廖文萍)1; Qian SB(钱声帮)2; Liao, WP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2009
卷号61期号:4页码:777-781
DOI10.1093/pasj/61.4.777
产权排序第1完成单位
收录类别SCI
关键词Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individuals (Zz Cassiopeiae) Stars: Multiple
摘要CCD observations of the eclipsing binary ZZ Cas were carried out during three nights from 2007 to 2008. Based on our new CCD times of light minimum and all available photoelectric and CCD data compiled from the literature, orbital period changes of ZZ Cas were analyzed. It was discovered that there may exist two cyclic variations (i.e., P(3) = 13.63 yr and A(3) = 0.02406 d, P(4) = 3.89 yr and A(4) = 0.00295 d). ZZ Cas is composed of early type component stars; the two cyclic variations can be explained by the light-time effect via the presence of the third and fourth bodies in the system. Minimal masses Of M(3) = 5.00 M(circle dot) and M(4) = 1.21 M(circle dot) were also calculated, respectively. These conclusions are in agreement with the result of previous investigations, that the additional bodies should contribute 23.6% to the total light of the system (Zasche 2009, New Astron., 14, 129), when the inclinations of the third and the fourth bodies are i(3) = i(4) = 58.degrees 9. The third and fourth bodies orbit the eclipsing binary at orbital distances of a(3) = 11.74 AU and a(4) = 6.14 AU, respectively.
项目资助者Chinese Nature Science Foundation [10778718, 10778707] ; Special Foundation of President of the Chinese Academy of Sciences ; West Light Foundation of the Chinese Academy of Sciences ; Yunnan Natural Science Foundation [2008CD157] ; National Key Fundamental Research Project [2007CB815406]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6264
URL查看原文
归档日期2010-07-09
WOS记录号WOS:000271364000022
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD CHANGES ; ECLIPSING BINARIES
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5832
专题双星与变星研究组
通讯作者Liao, WP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, P. R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), Beijing 100012, P. R. China Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
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Liao WP,Qian SB,Liao, WP . Light-Time Effect in the Early-Type Close Binary ZZ Cassiopeiae[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2009,61(4):777-781.
APA Liao WP,Qian SB,&Liao, WP .(2009).Light-Time Effect in the Early-Type Close Binary ZZ Cassiopeiae.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,61(4),777-781.
MLA Liao WP,et al."Light-Time Effect in the Early-Type Close Binary ZZ Cassiopeiae".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61.4(2009):777-781.
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