Abstract
The recent detection of the super-Eddington persistent luminosity of the burstingpulsar GRO J1744-28 suggests that the x-ray radiation in this object is emittedby the side walls of high accretion columns standing on the magnetic polar caps.We show that the observed energy dependence of the pulsed fraction in the x-rayflux of GRO J1744-28 can result from a non-uniform distribution of the effectiveemission temperature over the height of the column. The effect of gravitationallight bending near the surface of the neutron star must be taken into account.
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