Directionality effects in the transfer of X-rays from an accreting magnetized neutron star - Beam and pulse shapes

Details Directionality effects in the transfer of X-rays from an accreting magnetized neutron star - Beam and pulse shapes Directionality effects in the transfer of X-rays from an accreting magnetized neutron star - Beam and pulse shapes

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..695m&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 695-712.

Astronomy and Astrophysics

Astronomy

22

Magnetic Stars, Neutron Stars, Radiative Transfer, Stellar Atmospheres, X Ray Astronomy, Angular Distribution, Polarization Characteristics, Pulse Amplitude, Scattering Cross Sections, Slabs

Scientific paper

The direction-dependent transfer of X-rays in a plane-parallel atmosphere is discussed. A transfer formalism is presented, which incorporates the full angular and polarization dependence of the cross sections. A slab illuminated from below and a semi-infinite medium at constant temperature and density are examined, and theoretical beam and X-ray pulse shapes are obtained for models of X-ray pulsars. Numerical results are presented for parameters typical of hot polar caps of accreting magnetized neutron stars, and the frequency and phase dependence of the pulse structure is compared with observations. The amount of computation required in the approach is significantly less than in Monte Carlo photon escape calculations, and it is concluded that the peculiarities of the cross sections in a magnetized field and the structure of the atmosphere play a large role in determining the pulse shape of accreting neutron stars.

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