The symbiotic binary ZZ CMi: Intranight variability and suggested outbursting nature

We present photometric and spectral observations of the symbiotic star ZZ CMi. We detect intranight variability—flickering and smooth variations in U band. The amplitude of the flickering is about 0.10−0.20 mag in U band. In the B band, the variability is lower, with amplitude ≤0.03 mag. We also detect variability in the Hα and Hβ emission lines, and find an indication for outflow with velocity of about 120-150 km/s. The results indicate that ZZ CMi is an accretion-powered symbiotic containing an M4-M6 III cool component with a white dwarf resembling recurrent novae and jet-ejecting symbiotic stars.