On the Relative Importance of Photoevaporative and Hydrodynamic Effects in the Ablation of Self‐gravitating Globules in Compact HiiRegions

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Abstract
We investigate in detail the process of hydrodynamic ablation, both for the case of subsonic and for supersonic flows, of isothermal self-gravitating globules. The results are then compared with those for photoevaporative mass loss to estimate which of the two processes is the dominant mechanism for the mass loss of self-gravitating globules embedded in compact H II regions. This material then goes on to mass-load the stellar wind, thereby altering its dynamical properties. Using our results, we perform numerical simulations of the evolution of such H II regions, taking into account both possible mass-loading processes, together with the effect of the finite lifetime of the globules. We find that for compact H II regions with central stars possessing high ionizing photon rates the photoevaporation process dominates.

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