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

Xu-Dong Zhang, Yun-Xia Yu, Fu-Yuan Xiang, Ke Hu

Abstract


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 Pmod = 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 Pmod = 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.


Keywords


binaries: close — binaries: eclipsing — stars: individual (FG Hya, GR Vir)

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DOI: http://dx.doi.org/10.1088/1674%E2%80%934527%2F17%2F12%2F128

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Print ISSN: 1674-4527

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