Preliminary musicos 96 results on balmer line variability on the T tauri star SU aurigae

The study of young stellar objects is essential for the further understanding of the early evolutionary stages of the Sun and similar low-mass stars. In this context, T Tauri stars supply valuable information on their pre-main sequence evolution. SU Aur is a classical T Tauri star that shows little veiling and few emission lines. The Balmer line profiles are extremely variable, even on short time scales. We present results from the analysis of the variability of these spectral lines, based on a data set obtained during the world-wide multi-site spectroscopic MUSICOS 1996 campaign. We attempt to describe the interaction of the stellar magnetosphere and the accretion disk, and search for the signature of mass inflow and ejection.