X-rays from accretion shocks in T Tauri stars: The case of BP Tau J. H. M. M. Schmitt, J. Robrade, J.-U. Ness, F. Favata and B. Stelzer A&A, 432 2 (2005) L35-L38 Published online: 02 March 2005 DOI: 10.1051/0004-6361:200500014