Variable accretion as a mechanism for brightness variations in T Tauri S R. van Boekel, A. Juhász, Th. Henning, R. Köhler, Th. Ratzka, T. Herbst, J. Bouwman and W. Kley A&A, 517 (2010) A16 Published online: 26 July 2010 DOI: 10.1051/0004-6361/200913840