ABSTRACT
We developed a model to fit the spectral distribution of energy (SED) by reproducing the infrared excess observed in young stellar objects (YSO) ? to estimate the contribution of a disc and/or a dust envelope in the total emitted flux.
It is assumed a central star surrounded by a passive disc, both embedded in a spherical thin envelope. Different blackbody components are considered. The temperature laws are Tdisk ? r -0.75 and Tenvelope ? r -0.4
The resulting parameters from the SED's fit of Herbig Ae/Be stars and Class I T Tauri stars are presented.