The line variability of high-resolution spectra of TW Hya

We present the analysis of 42 spectra of the Classical T Tauri star TW Hya observed with the FEROS echelle spectrograph over one and a half year. The star exhibits strong emission lines that show a variety and variability in profile shapes. The system apparently shows periodic variations in line and veiling intensities. We see evidence of a variation in the mass accretion rate over a 1 year period and magnetospheric accretion models with moderate mass accretion rates (10(-9) up to 10(-8) M(circle dot)yr(-1)) fit well our observed NaD lines. TW Hya presents typical spectral characteristics of the low mass accretion rate stars in Taurus, despite its older age, indicating that active accretion disks can survive up to 10 Myr without changing much.