Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..311b&link_type=abstract
Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 311-321.
Astronomy and Astrophysics
Astrophysics
108
Magnetic Stars, Neutron Stars, Pulsars, Radiative Transfer, X Ray Sources, Astrophysics, Eddington Approximation, Pencil Beams, Stellar Atmospheres, White Dwarf Stars
Scientific paper
A model for the radiation pattern of X-ray pulsars is proposed in which the accreting gas flow is stopped by nuclear collisions deep within the atmosphere, and the radiation emerging from the surface at frequencies much less than the electron cyclotron frequency has a pencil-beam pattern and is highly polarized due to the high anisotropy in the scattering cross section of photons by electrons in the magnetized plasma. The problem of radiative transfer in an atmosphere with a strong magnetic field is solved, theoretical X-ray pulse profiles are calculated, and the spectrum and polarization of emerging X-rays are discussed. In the framework of the proposed model, an upper limit on the luminosity of X-ray pulsars is obtained which can greatly exceed the Eddington critical value per unit surface area. The luminosity is shown to be limited by distortion of the beam pattern due to scattering of emitted X-rays by electrons of the infalling gas. It is shown that the present mechanism can also explain optical pulsations from magnetic white dwarfs.
Basko Mikhail
Sunyaev Rashid A.
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