Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..911y&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 911-920.
Astronomy and Astrophysics
Astrophysics
19
Magnetic Stars, Neutron Stars, Optical Thickness, Stellar Mass Accretion, Stellar Spectrophotometry, X Ray Spectra, Bremsstrahlung, Cyclotron Frequency, Photons, Radiant Flux Density, X Ray Sources
Scientific paper
We obtain the thermal structure and the spectral radiation energy density of the two normal modes in the lower, dense parts of the accretion column. It is shown that the radiation flux into the optically thin parts of the column is very different from the Planck distribution. The spectrum of the radiation escaping from the column contains no "line" feature provided the ratio of the average energy of the photons to the cyclotron energy is small (≲ O.2) and Comptonization is insignificant. It is further shown that the contribution of the magnetic bremsstrahlung emissivity from the optically thin parts of the column to the total X-ray luminosity is small (≲ 1%) compared to the emission from the dense parts.
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