Hot spots on neutron stars - The near-field gravitational lens

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gravitational Lenses, Hot Stars, Neutron Stars, Stellar Models, Light Curve, Near Fields, Photon Beams, Relativity, Spectral Energy Distribution, Stellar Gravitation, Stellar Luminosity, Stellar Rotation, Stellar Structure

Scientific paper

A simple model is presented for including gravity in the light curves of slowly rotating neutron stars whose emission is confined to circular antipodal polar caps. Both thermal and near thermal cases are condidered. It is found that for hot polar caps and typical neutron star parameters the light curves are essentially flat as a result of gravitational effects. If, however, photon emission is beamed, structure is, in general, restored to the light curve, depending on the nature of the beaming. For the most relativistic neutron stars it is found that there can be sharp peaks in the light curve induced solely by the gravitational lensing effect of the star. Results for a single hot spot are also presented. In an appendix the tidal deformation of an initially circular cone of light rays is derived.

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