curves are presented in figure 2 together with observations of A0620–00. (The data for A0620–00 is plotted 1.5 mag brighter than the observed value for clarity of presentation.) The model with both direct and indirect irradiation gives an optical light curve with a fast rise, a maximum, and a nearly exponential decline. As can be seen from figure 2, the direct irradiation has virtually no effect on the light curve. The modest indirect irradiation we have invoked gives a slight, but noticeable flattening of the light curve. More severe indirect irradiation would cause this flattening to be more extreme. For the irradiation parameter $C_{\rm X}\sim10^{-2}$, the disk would be stabilized. The nature of this irradiation stabilization will be explored in future work.

Note that our calculations never run into a radiation pressure-dominated regime nor an optically thin one, probably because the peak luminosity remains a slightly below that at which the radiation pressure dominates over the gas pressure.

 Mass Flow
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[3]{} [20pc]{} [Time-dependent evolution of the innermost accretion rate (${\dot M}_{\rm in}$) for cases with no irradiation (short dash), direct irradiation only (long dash), indirect irradiation only (dot-dash), and both direct and indirect irradiation (solid line).]{}

The model accretion 