Infrared emission from protostars

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Abstract
[[abstract]]The authors use an approximate technique to calculate the temperature profiles, and thereby the emergent spectral energy distributions, of protostars which derive all their luminosity by infall of a gas and dust envelope. The formulation is general, but the application is to protostars with spherical symmetry. It is shown that the emergent spectrum in the infrared from the dust envelope is insensitive to the details assumed for the temperature profile as long as allowance is made for a transition from optically thick to optically thin conditions and luminosity conservation is enforced at an inner shell and an outer shell. An atlas of emergent spectral energy distributions is presented for a grid of values of the instantaneous mass M of the protostar and the mass infall rate M. The theoretical spectra consistently produce too little mid-infrared radiation in comparison with the observed sources, especially those which are in a fairly late stage of protostellar evolution. --------------------------------------------------------------------------------[[fileno]]2010118010096[[department]]物理

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