HIGH-ENERGY PROPERTIES OF X-RAY SOURCES OBSERVED WITH BEPPOSAX

We report on highlight results on celestial sources observed in the hi gh energy band (> 20 keV) with BeppoSAX. In particular we review the s pectral properties of sources that belong to different classes of obje cts, i.e., stellar coronae (Algol), supernova remnants (Cas A), low ma ss X-ray binaries (Cygnus X-2 and the X-ray burster GS1826-238), black hole candidates (Cygnus X-1) and Active Galactic Nuclei (Mkn 3). We d etect, for the first time, the broad-band spectrum of a stellar corona up to 100 keV; for Cas A we report upper Limits to the Ti-44 line int ensities that are lower than those available to date; for Cyg X-2 we r eport the evidence of a high energy component; we report a clear detec tion of a broad Fe K line feature from Cyg X-1 in soft state and durin g its transition to hard state; Mkn 3 is one of several Seyfert 2 gala xies detected with BeppoSAX at high energies, for which Compton scatte ring process is important.