Volume 380, Number 2, December III 2001
|Page(s)||490 - 493|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||15 December 2001|
BeppoSAX study of the X-ray binary XB1832-330 located in the globular cluster NGC6652
Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Osservatorio Astronomico di Roma, via Frascati 33, Monteporzio Catone, 00040 Roma, Italy
3 Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, via Gobetti 101, 40129 Bologna, Italy
Corresponding author: A. N. Parmar, firstname.lastname@example.org
Accepted: 18 October 2001
Results of a 2001 March 17-20 BeppoSAX observation of the X-ray binary XB1832-330 located in the globular cluster NGC6652 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 ([CITE]). The best-fit spectral parameters are similar to those of the globular cluster sources with orbital periods of <1 hr, implying that XB1832-330 is also an ultra-compact system. A plausible optical candidate to XB1832-330has recently been discovered by Heinke et al. ([CITE]) 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 2σ upper limit to the semi-amplitude of any sinusoid of ≲1.5% .
Key words: accretion, accretion disks / stars: individual: XB1832-330 - globular clusters: individual: NGC6652 / X-rays: general
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.