Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54 J. M. Torrejón, I. Kreykenbohm, A. Orr, L. Titarchuk and I. Negueruela A&A, 423 1 (2004) 301-309 Published online: 29 July 2004 DOI: 10.1051/0004-6361:20035743