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Broad-band X-ray measurements of GS 1826-238 | | J.J.M. in ’t Zand
; J. Heise
; E. Kuulkers
; A. Bazzano
; M. Cocchi
; P. Ubertini
; | | Date: |
20 Jul 1999 | | Journal: | Astron.Astrophys. 347 (1999) 891 | | Subject: | astro-ph | | Affiliation: | SRON), E. Kuulkers (SRON + SIU), A. Bazzano, M. Cocchi, P. Ubertini (IAS-CNR | | Abstract: | The broad band X-ray spectrum of the low-mass X-ray binary (LMXB) GS1826-238 was measured with the narrow-field instruments on BeppoSAX on April 6 and 7, 1997. The spectrum is consistent with the Comptonization of a 0.6 keV thermal spectrum by a hot cloud of temperature equivalent kT=20 keV. During the observation two type I X-ray bursts were detected. From the bursts an upper limit to the distance could be derived of 8 kpc. Combined with an elsewhere determined lower limit of 4 kpc this implies a persistent X-ray luminosity between 3.5 X 10^36 and 1.4 X 10^37 erg/s which is fairly typical for a LMXB X-ray burster. The accurate determination of the energetics of the two bursts and the persistent emission confirm results with the Wide Field Cameras on BeppoSAX in a narrower bandpass (Ubertini et al. 1999). Comparison with independent X-ray measurements taken at other times indicates that GS 1826-238 since its turn-on in 1988 is a rather stable accretor, which is in line with the strong regularity of type I X-ray bursts. | | Source: | arXiv, astro-ph/9907265 | | Services: | Forum | Review | PDF | Favorites | |
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