Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..485s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 2, March 1985, p. 485-495. Research supported by the Deutsche Forschu
Astronomy and Astrophysics
Astrophysics
9
Pulsars, Radiative Transfer, Stellar Mass Accretion, Stellar Radiation, X Ray Sources, Magnetohydrodynamic Flow, Neutron Stars, Optical Thickness, Stellar Models, Stellar Spectra, Stellar Winds, Two Dimensional Models
Scientific paper
The influence of the hot spot that very likely forms at the base of the accretion column of X-ray pulsars with X-ray luminosities not much larger than ≡1030W onto emitted spectra, angle dependent fluxes and pulse shapes is discussed. In the optically thin regime the hot spot is modelled by a thin slab and the radiative transfer through the atmosphere is treated in the zero scattering approximation. Special attention is paid to the influence of atmospheric bulk motion that leads to pulse-phase dependent cyclotron line centers. In the optically thick regime radiative transport is treated in the diffusion approximation, neglecting effects from Comptonization. A detailed mathematical two-dimensional photon-diffusion model is presented for a homogeneous and isothermal cylindrical accretion column.
Herold Heinz
Ruder Hanns
Soffel Michael
Ventura Joana
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