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A strange phenomenon in XZ Andromedae: two Keplerian periods with a 1:3 ratio
Yuan, Jin-Zhao1; Qian SB(钱声帮)2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2019-09-01
Volume19Issue:9Pages:8
DOI10.1088/1674-4527/19/9/128
Contribution Rank第2完成单位
Indexed BySCI
Keywordbinaries: close stars: individual: XZ Andromedae
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11705111] ; National Natural Science Foundation of China[U1231121]
Funding OrganizationNational Natural Science Foundation of China[11705111, U1231121]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000485147000006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBINARY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/21141
Collection双星与变星研究组
Corresponding AuthorYuan, Jin-Zhao
Affiliation1.Department of Physics, Shanxi Normal University, Linfen 041004, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
Recommended Citation
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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