ACCRETION DISKS AROUND T-TAURI STARS .4. THE DISK-STAR BOUNDARY-LAYER

We extended Bouvier & Bertout's (1992) analysis of T Tauri star spectr a by incorporating Duschl & Tscharnuter's (1991) models for the global structure of boundary layers. Whereas this would allow for radially e xtended boundary layers, we indeed find radially thin boundary layers with typical extents of almost-equal-to 3% of the radius of the accret ing star. Moreover, both, the boundary layer width and the mass flow r ate, are better constrained in this new approach.