ACCRETION DISKS AROUND BLACK HOLES WITH ADVECTION AND OPTICAL DEPTH TRANSITION

We consider the stationary problem of accretion on a nonrotating black hole. Advection is taken into account and used bridging formula for radiative loses at high and low effective optical depths. Investigate the global solutions for the accretion disc, describing the continuous transition between optically thick outer and optically thin inner regions. The existence of maximum temperature of the disk for model with the viscosity parameter α = 0:5. For model with α = 0:01 is shown the absence of optically thin regions for any values of the of accretion rate.