For four classical T Tauri stars, narrow helium emission line velocity shifts are not accompanied by phase shifts expected from radial gas inflow, pointing to non-Doppler effects such as Stark broadening and optical depth.
Dodin, MNRAS,475(4), 4367 (2018)
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Radial velocities of narrow emission line components in the spectra of T Tauri stars
For four classical T Tauri stars, narrow helium emission line velocity shifts are not accompanied by phase shifts expected from radial gas inflow, pointing to non-Doppler effects such as Stark broadening and optical depth.