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X-ray flux and pulse frequency changes of three high mass X-ray binary pulsars: Vela X-1, GX 301-2 and OAO 1657-415
Sitki Çagdas Inam and
Received 14 June 1999 / Accepted 7 October 1999
Using archival BATSE (Burst and Transient Source Experiment) 20-60 keV band X-ray flux and pulse frequency time series, we look for correlations between torque, luminosity and specific angular momentum for three high mass X-ray binary pulsars Vela X-1, GX 301-2 and OAO 1657-415. Our results show that there is no correlation between pulse frequency derivative and flux which may be an indication of the absence of stable prograde accretion disk. From the strong correlation of specific angular momentum and torque, we conclude that the accretion geometry changes continuously as suggested by the hydrodynamic simulations (Blondin et al. 1990).
Key words: X-rays: stars accretion, accretion disks stars: pulsars: individual: OAO 1657-415 stars: pulsars: individual: GX 301-2 stars: pulsars: individual: Vela X1
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Online publication: December 17, 1999