Cyclotron line formation by resonant Compton-cyclotron scattering in Herculis-XI

Details Cyclotron line formation by resonant Compton-cyclotron scattering in Herculis-XI Cyclotron line formation by resonant Compton-cyclotron scattering in Herculis-XI

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78...53b&link_type=abstract

Astronomy and Astrophysics, vol. 78, no. 1, Sept. 1979, p. 53-64.

Astronomy and Astrophysics

Astronomy

45

Compton Effect, Cyclotron Resonance, Pulsars, Resonance Scattering, X Ray Stars, Cold Plasmas, Energy Budgets, Isotropic Media, Line Spectra, Photons, Radiant Cooling, X Ray Astronomy

Scientific paper

Calculations are presented which show that a spectrum similar to the one observed for Hercules X-1 can be generated. It is shown that there is no straightforward way to explain how observed 'lines' are produced. The effect of the cyclotron process as resonance scattering and Compton diffusion on a thermal spectrum in a simple model (cold plasma, plane-parallel geometry, isotropic scattering cross section) is studied. It is shown that even in such a crude model, a good account is given of the formation of the observed spectrum, continuum as well as lines. The cold-gas approximation is shown not to be inconsistent with the thermal balance of the accreting column.

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