XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4–5209 A. De Luca, S. Mereghetti, P. A. Caraveo, M. Moroni, R. P. Mignani and G. F. Bignami A&A, 418 2 (2004) 625-637 Published online: 09 April 2004 DOI: 10.1051/0004-6361:20031781