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2 Acta Astronomica

2 1998

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The Influence of Reprocessing in the Column on the Light Curves of Accretion Powered Neutron Stars

Čemeljić M., Bulik T.

Acta Astronomica

1998

Vol. 48, No. 1

65--75

Flow of matter onto strongly magnetized neutron stars in X-ray binaries proceeds through accretion funnels that roughly follow geometry of the magnetic field. X-rays originate near the surface of the neutron star, and it may happen that the accretion flow passes through the line of sight as the star rotates. We consider the effects of such accretion flow eclipses on the X-ray light curves of accretion powered pulsars, and present a set of X-ray light curves measured by BATSE for A0535+262 for which this phenomenon is very likely to take place.

The Effect of e+e- Pair Production on Gamma-Ray Luminosities of Pulsars

Dyks J.

Acta Astronomica

1998

Vol. 48, No. 2

355--372

We present details of a modified phenomenological polar cap model of γ-ray emission from pulsars, introduced recently by Rudak and Dyks (1998). The model attributes observed γ-rays mostly to electron-positron pairs created in magnetospheres by high energy curvature photons emitted by primary electrons. We show how the basic ingredient of the model - the number of created e± pairs - depends on the pulsar period, and the magnetic field, for two different prescriptions for the energy of the primaries, and how it affects predictions for the γ-ray luminosity. The model has been successfully applied to the results of the Compton Gamma Ray Observatory (CGRO) observations.