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4U1812-12 is a faint persistent and weakly variable neutron star X-raybinary. It was observed by BeppoSAX between April 20th and 21st, 2000 in a hardspectral state with a bolometric luminosity of ~2x10^36 ergs/s. Its broad bandenergy spectrum is characterized by the presence of a hard X-ray tail extendingabove ~100 keV. It can be represented as the sum of a dominant hard Comptonizedcomponent (electron temperature of ~36 keV and optical depth ~3) and a weaksoft component. The latter component which can be fitted with a blackbody ofabout 0.6 keV and equivalent radius of ~2 km is likely to originate from theneutron star surface. We also report on the first measurement of the powerdensity spectrum of the source rapid X-ray variability, as recorded during asimultaneous snapshot observation performed by the Rossi X-ray Timing Explorer.As expected for a neutron star system in such hard spectral state, its powerdensity spectrum is characterized by the presence of a ~0.7 Hz low frequencyquasi-periodic oscillation together with three broad noise components, one ofwhich extends above ~200 Hz.Comment: 6 pages, 3 figures, accepted for publication in A&

Simultaneous BeppoSAX and Rossi X-ray timing explorer observations of 4U 1812–12