New weak-line T Tauri stars in Orion from the ROSAT all-sky survey J. M. Alcalá, L. Terranegra, R. Wichmann, C. Chavarría-K., J. Krautter, J. H.M.M. Schmitt, M. A. Moreno-Corral, E. de Lara and R. M. Wagner Astron. Astrophys. Suppl. Ser., 119 1 (1996) 7-24 Published online: 15 October 1996 DOI: 10.1051/aas:1996224