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New observations of the old magnetic nova GQ Muscae

We report photometric observations of GQ Mus performed between 1992 and 2011. We find that the total amplitude of the orbital modulation of its brightness decreased from ~0.9 mag in 1992 to ~0.2 mag in 2010, becoming comparable to the amplitude of chaotic flickering on a time scale of several minutes. Optical spectra obtained in 2001 and 2012 indicate continuing activity of GQ Mus. The spectra show broad emission lines of HeII and HI typical for magnetic cataclysmic variables. The nova was observed as an UV-bright object in 2001 and 2012. We also show that the orbital period of GQ Mus has been constant between 1989 and 2010-2011.

preprint2014arXivOpen access

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