Rapid spectral change in the symbiotic binary V694 Mon (MWC 560)

V694 Mon was a symbiotic binary forming high-velocity jets, showing high-amplitude flickering, and regular outbursts with the period of 1930 days. Munari et al. (2016, New Astronomy V.49, 43) discovered periodic 331 day variations in the Ic band where the radiation of the M giant dominates.