THE SAMPLE I
Spectral indexes (a) of a large sample (93 YSO) were evaluated by using our model in a previous work (Hetem et al. 1994). This sample was selected from Pico dos Dias Survey (PDS - Gregorio-Hetem et al. 1992, Torres et al. 1995), a search for YSO based on IRAS colors.
For the present work we choose 14 embedded objects (a?0)