Mass accretion rate in the jet-driving symbiotic binary MWC 560

We analyze photometric observations of the symbiotic star MWC 560 in B and V bands obtained during the period 1990-2023. We estimate the luminosity and the mass accretion rate of the hot component. We find that the luminosity varies in the range from 200 $L_{\odot }$ to 3000 $L_{\odot }$, corresponding to a mass accretion rate in the range $1\times {10}^{-7}-2\times {10}^{-6}{M}_{\odot }y{r}^{-1}$ (for a 0.9 $M_{\odot }$ white dwarf and distance 2217 pc). The optical flickering disappears at mass accretion rate of about $1\times {10}^{-6}{M}_{\odot }y{r}^{-1}$, which sets an upper limit for the short-term variability from accreting white dwarf.