Evaporation of Dirty Ice Particles Surrounding Early Type Stars. IV. Various Size Distribution

We calculate the evaporation processes of dirty ice particles with various size distributions surrounding early type stars. If the initial distribution function of the grain radius, a, is given by n(a)=n(0) exp ( 24a8), where a is in microns, the calculated interstellar absorption, after considering evaporation, processes, is consistent with the observed values in the directions of the Orion Nebula and the Orion Association. Key words: Evaporation of dirty ice particles; Interstellar grains; Size d istribtion.