The effect of gravitational lensing on pulsed emission from neutron stars exhibiting quasi-periodic oscillations

Details The effect of gravitational lensing on pulsed emission from neutron stars exhibiting quasi-periodic oscillations The effect of gravitational lensing on pulsed emission from neutron stars exhibiting quasi-periodic oscillations

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324l..63w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. L63-L66. Navy-supported rese

Astronomy and Astrophysics

Astrophysics

22

Gravitational Lenses, Harmonic Oscillation, Neutron Stars, Pulsars, Pulsed Radiation, Stellar Mass Accretion, Binary Stars, Light Curve, Polar Caps, Radiative Transfer, Stellar Magnetic Fields

Scientific paper

Some quasi-periodic oscillation models are based on accretion onto a neutron star possessing a weak magnetic field. These models successfully explain many aspects of the observed oscillations, yet they acquire a rapidly rotating neutron star possessing a magnetic field that can channel accretion flow, leading to uneven heating of the star surface. This is similar to what happens in accreting binary pulsars, yet modulation of X-ray flux at the spin period has not been observed. It is suggested that gravitational deflection of photons can be very effective in reducing this pulsed flux under exactly the conditions required in these QPO models. Gravitational effects appear to be essential to reducing the pulsed flux to levels consistent with observation. Implications for QPO observations and for the theory of binary pulsars are discussed.

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