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We present an analysis of archival RXTE and BeppoSAX data of the X-ray source4U2206+54 . For the first time, high energy data (> 30 kev) are analyzed forthis source. The data are well described by comptonization models (CompTT andBMC) in which seed photons with temperatures between 1.1 kev and 1.5 kev arecomptonized by a hot plasma at 50 kev thereby producing a hard tail whichextends up to, at least, 100 kev. We offer a new method of identification ofneutron star systems using a temperature - luminosity relation. If a givenX-ray source is characterized by a low bolometric luminosity and a relativelyhigh color blackbody temperature (>1 kev) it has necessarily to be a neutronstar rather than a black hole. From these arguments it is shown that the areaof the soft photon source must be small (r ~ 1 km) and that the accretion disk,if present, must be truncated very far from the compact object. Here we reporton the possible existence of a cyclotron line around 30 kev. The presence of aneutron star in the system is strongly favored by the available data.Comment: Accepted for publication in A&A. 9 pages, 7 figures. Submitted to  journal in November 200

Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54