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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2017,（12）
• 页码范围: 213-218
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-4527/17/12/128

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 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.