Reanalysis of the orbital period variations of two DLMR overcontact binaries:FG Hya and GR Vir

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英文篇名：Reanalysis of the orbital period variations of two DLMR overcontact binaries:FG Hya and GR Vir 作者：Xu-Dong ; Zhang ; Yun-Xia ; Yu ; Fu-Yuan ; Xiang ; Ke ; Hu 英文作者：Xu-Dong Zhang;Yun-Xia Yu;Fu-Yuan Xiang;Ke Hu;Department of Physics,Xiangtan University; 英文关键词：binaries:close;;binaries:eclipsing;;stars:individual(FG Hya,GR Vir) 中文刊名：TTWL 英文刊名：天文和天体物理学研究(英文版) 机构：Department of Physics,Xiangtan University; 出版日期：2017-12-15 出版单位：Research in Astronomy and Astrophysics 年：2017 期：v.17 基金：supported by the National Natural Science Foundation of China (Grant No.11703020);; Joint Research Funds in Astronomy (U1531108,U1731106 and U1731110) under cooperative agreement between the National Natural Science Foundation of China and Chinese Academy of Sciences 语种：英文; 页：TTWL201712010 页数：6 CN：12 ISSN：11-5721/P 分类号：97-102

摘要

We investigate orbital period changes of two deep, low mass ratio(DLMR) overcontact W UMa-type binaries, FG Hya and GR Vir. It is found that the orbital period of FG Hya shows a cyclic change with a period of P_(mod)= 54.44 yr. The cyclic oscillation may be due to a third body in an eccentric orbit, while the orbital period of GR Vir shows a periodic variation with a period of P_(mod)= 28.56 yr and an amplitude of A = 0.0352 d. The periodic variation of GR Vir can be interpreted as a result of either the light-time effect of an unseen third body or the magnetic activity cycle.
        We investigate orbital period changes of two deep, low mass ratio(DLMR) overcontact W UMa-type binaries, FG Hya and GR Vir. It is found that the orbital period of FG Hya shows a cyclic change with a period of P_(mod)= 54.44 yr. The cyclic oscillation may be due to a third body in an eccentric orbit, while the orbital period of GR Vir shows a periodic variation with a period of P_(mod)= 28.56 yr and an amplitude of A = 0.0352 d. The periodic variation of GR Vir can be interpreted as a result of either the light-time effect of an unseen third body or the magnetic activity cycle.

引文

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