Variability of Southern T Tauri Stars. II. The Spectral Variability of the Classical T Tauri Star TW Hydrae

@inproceedings{Alencar2002VariabilityOS,
  title={Variability of Southern T Tauri Stars. II. The Spectral Variability of the Classical T Tauri Star TW Hydrae},
  author={Silvia H. P. Alencar and C. C. Batalha},
  year={2002}
}
We present the analysis of 42 spectra of the Classical T Tauri star TW Hya observed with the FEROS echelle spectrograph over 2 yr. We determined the rotational and radial velocities of TW Hya, obtaining v sin i = 5 ± 2 km s-1 and vrad = 12.5 ± 0.5 km s-1. The star exhibits strong emission lines that show substantial variety and variability in their profile shapes. Emission lines such as Hα, Hβ, and He I show both outflow and infall signatures, which change on different timescales. The system… CONTINUE READING