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 |
DOI | 10.1088/1674-4527/19/9/128 |
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. |
入库方式: OAI收割
来源:云南天文台
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