Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-22
Astronomy and Astrophysics
Astrophysics
5 pages. To appear in A&A
Scientific paper
10.1051/0004-6361:20011464
Results 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 (0.1-200 keV) 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 (2000). The best-fit spectral parameters are similar to those of the globular cluster sources with orbital periods of <1 hr, 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) which shows evidence for possible 0.92, 2.22, or 4.44 hr periodicities. We find no evidence for any 2-10 keV periodic modulation at any of these periods with a 2 sigma upper limit to the semi-amplitude of any sinusoid of < 1.5%.
Frontera Filippo
Oosterbroek Tim
Parmar Arvind N.
Sidoli Lara
Stella Luigi
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