An X-ray spectral survey of sources in globular clusters: first results

Preliminary results of a BeppoSAX observation program of luminous X-ray sou rces in globular clusters suggest a common physical scenario: the superposi tion of a Comptonized spectrum, originating in a boundary layer between the accretion disk and the neutron star, and a thermal component, probably rel eased by the accretion disc as multi-temperature blackbody. In this scenari o, the spectra are steeper in brighter sources, due to the strong correlati on between thermal cutoff energy and luminosity.