Abstract
We developed a numerical code which evaluates the propagation, absorption and reemission of radiation in circumstellar envelopes with the aim of study the emergent flux from protostellar objects. The circumstellar medium was represented by an envelope model based on the kinetic theory of gases, and the opacity sources were attributed to a mixture of gas and dust. We have studied how the Spectral Energy Distribution (SED) is affected by the variation of model parameters. We found that the overall spectral energy distribution and color data of low mass protostellar objects (Class 0 - Class III) can be reproduced by the present model.
