2001A&A...380..490P

Result. of a 2001 March 17-20 BeppoSAX observation of the X-ray binary XB 1832-330 located in the globular cluster NGC 6652 are presented. In contrast to the majority of luminous globular cluster X-ray sources, the (0.1-200keV) BeppoSAX spectrum cannot be fit with a disk-blackbody and comptt Comptonization model, unless partial covering is included. This confirms the ASCA detection of partial covering by Mukai & Smale (2000ApJ...533..352M). The best-fit spectral parameters are similar to those of the globular cluster sources with orbital periods of <1hr, implying that XB 1832-330 is also an ultra-compact system. A plausible optical candidate to XB 1832-330 has recently been discovered by Heinke et al. (2001, preprint) which shows evidence for possible 0.92, 2.22, or 4.44 hr periodicities. We find no evidence for any 2-10keV periodic modulation at any of these periods with a 2σ upper limit to the semi-amplitude of any sinusoid of ≲1.5%.