The Oblate Schwarzschild Approximation for Light Curves of Rapidly Rotating Neutron Stars

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dc.creatorMorsink, Sharon M.
dc.creatorLeahy, Denis A.
dc.creatorCadeau, Coire
dc.creatorBraga, John
dc.date2007-03-06
dc.date2007-04-05
dc.date.accessioned2026-07-07T11:00:59Z
dc.date.available2026-07-07T11:00:59Z
dc.descriptionWe present a simple method for including the oblateness of a rapidly rotating neutron star when fitting X-ray light curves. In previous work we showed that the oblateness induced by rotation at frequencies above 300 Hz produces a geometric effect which needs to be accounted for when modelling light curves to extract constraints on the neutron star's mass and radius. In our model X-rays are emitted from the surface of an oblate neutron star and propagate to the observer along geodesics of the Schwarzschild metric for a spherical neutron star. Doppler effects due to rotation are added in the same manner as in the case of a spherical neutron star. We show that this model captures the most important effects due to the neutron star's rotation. We also explain how the geometric oblateness effect can rival the Doppler effect for some emission geometries.
dc.description8 pages, 4 figures. v2: minor changes. Accepted by the Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0703123
dc.identifierhttp://arxiv.org/abs/astro-ph/0703123
dc.identifierAstrophys.J.663:1244-1251,2007
dc.identifierdoi:10.1086/518648
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187826
dc.subjectAstrophysics
dc.titleThe Oblate Schwarzschild Approximation for Light Curves of Rapidly Rotating Neutron Stars
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