PROTOPLANETARY DISKS AROUND CLASSICAL T TAURI STARS

We have studied the energy distribution curves for a statistically significant number of classical T Tauri stars. It is shown that out of 49 stars, only 7 (14%) has I type of spectrum distribution, the rest belong to type II. Fundamental parameters, including the mass and age of objects are determined. It is shown that the amount of excess radiation in the far IR range increases with age. The change in mass with age, in contrast to Herbig's AeBe stars, exhibits a complex character.