Multiwavelength monitoring of BD +53°2790, the optical counterpart to 4U 2206+54 P. Blay, I. Negueruela, P. Reig, M. J. Coe, R. H. D. Corbet, J. Fabregat and A. E. Tarasov A&A, 446 3 (2006) 1095-1105 Published online: 20 January 2006 DOI: 10.1051/0004-6361:20053951