Abstract
The recent detection of the super-Eddington persistent luminosity of the bursting pulsar GRO J1744-28 suggests that the x-ray radiation in this object is emitted by 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-ray flux of GRO J1744-28 can result from a non-uniform distribution of the effective emission temperature over the height of the column. The effect of gravitational light bending near the surface of the neutron star must be taken into account.
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