Resolved polarization changes across Hα in the classical T Tauri star RY Tauri Jorick S. Vink, J. E. Drew, T. J. Harries, R. D. Oudmaijer and Y. C. Unruh A&A, 406 2 (2003) 703-707 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030833