MASS-LOADED ASTRONOMICAL FLOWS .4. A TIME-DEPENDENT HYDRODYNAMIC MODEL OF AN OBSERVED CLUMPY WIND-BLOWN BUBBLE, RCW 58

We provide an example demonstrating the significance of the clumpy natures of diffuse sources for their evolution. We present a one-dimensional, time-dependent hydrodynamic model with mass injection, from engulfed clumps, into shocked stellar wind of a Wolf-Rayet wind-blown nebula. The observed bubble radius and expansion velocity are matched. Most importantly, the model reproduces the broad velocity range over which gas with temperatures less than about 1.5 x 10(5) K is observed.