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Chinese Academy of Sciences Institutional Repositories Grid
A strange phenomenon in XZ Andromedae: two Keplerian periods with a 1:3 ratio

文献类型:期刊论文

作者Yuan, Jin-Zhao1; Qian SB(钱声帮)2
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2019-09-01
卷号19期号:9页码:8
ISSN号1674-4527
关键词binaries: close stars: individual: XZ Andromedae
DOI10.1088/1674-4527/19/9/128
产权排序第2完成单位
文献子类Article
英文摘要

Six mid-eclipse times of the eclipsing binary XZ And are obtained, which are analyzed together with others collected from the literature. Two sets of cyclic variations with periods of 33.43 and 100.4yr are found if a double-Keplerian model is used to fit the data. The 1:3 ratio of the periods suggests that both cyclic variations arise from dynamic motions of two companions rather than magnetic activity of the eclipsing pair. According to the double-Keplerian model, the companions have masses of similar to 1.32 M-circle dot and similar to 1.33 M-circle dot, respectively. Comparing with the total mass of the eclipsing pair of 3.12 M-circle dot, it is obvious that XZ And is a general N-body system. The strong gravitational perturbation between the two companions invalidates the double-Keplerian model. It is strange that two Keplerian periods with a 1:3 ratio are derived from the best fits with an "inappropriate" model. This illogical, but interesting phenomenon also appears in two other Algol systems, suggesting that our discoveries deserve attention from astronomers.

学科主题天文学 ; 恒星与银河系 ; 恒星天文学
URL标识查看原文
出版地20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
WOS关键词BINARY
资助项目National Natural Science Foundation of China[11705111] ; National Natural Science Foundation of China[U1231121]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号WOS:000485147000006
资助机构National Natural Science Foundation of China[11705111, U1231121]
源URL[http://ir.ynao.ac.cn/handle/114a53/21140]  
专题云南天文台_双星与变星研究组
通讯作者Yuan, Jin-Zhao
作者单位1.Department of Physics, Shanxi Normal University, Linfen 041004, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式
GB/T 7714
Yuan, Jin-Zhao,Qian SB. A strange phenomenon in XZ Andromedae: two Keplerian periods with a 1:3 ratio[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(9):8.
APA Yuan, Jin-Zhao,&Qian SB.(2019).A strange phenomenon in XZ Andromedae: two Keplerian periods with a 1:3 ratio.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(9),8.
MLA Yuan, Jin-Zhao,et al."A strange phenomenon in XZ Andromedae: two Keplerian periods with a 1:3 ratio".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.9(2019):8.

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来源:云南天文台

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