DUST OPACITIES FOR PROTOSTELLAR CORES

Basing on the coagulation model of Ossenkopf (1993), we systematically computed and tabulated the opacity of dust in dense protostellar core s between 1 mu m and 1.3 mm. The possible physical conditions were var ied especially considering the influence of different gas densities an d molecular depletion ratios. In comparison to the dust opacity in the diffuse interstellar medium, we found nowhere changes by more than th e factor 5 for ice-covered dust grains. Possible uncertainties and dev iations in environments with different physical conditions are discuss ed. Although one may imagine very special situations in which the dust opacity is changed by more than a factor 10, for physically reasonabl e conditions in dense protostellar cores, all possible deviations from the tabulated values may not sum up to more than a factor 2. Using th ese tables of dust opacities, the submm continuum radiation of cold du st in protostellar cores is a good tracer of their total mass.