Stability of accretion disks in presence of nucleosynthesis

We study the effect of nuclear reaction on a thin, axisymmetric, differenti ally rotating, inviscid, steady accretion flow around a black hole from an analytical point of view. We find that, for most of the reasonable disk par ameters, when the p-p reaction and the dissociation of deuterium and of hel ium are taken into account, the transonic region of the disk continues to h ave the inner sonic point and, if the temperature of the flow at the inject ion point could be raised (by some heating processes), the flow would have to pass through this inner sonic point. Otherwise, the flow may be unstable . We use the sonic-point analysis to study the solution. In the rest of the disk parameters the inner sonic point is absent altogether, and the flow w ill definitely be unstable.