Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241.1107w&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 1107-1121.
Astronomy and Astrophysics
Astrophysics
54
Binary Stars, Cyclotron Radiation, Neutron Stars, Radiative Transfer, Stellar Mass Accretion, Stellar Spectra, X Ray Sources, Distribution Functions, Electromagnetic Absorption, Electron Scattering, Emission Spectra, Line Spectra, Resonance, X Ray Spectra
Scientific paper
The radiative transfer of cyclotron line photons through an optically thick resonant scattering atmosphere of recoiling electrons is discussed in light of the discovery of a 58 keV emission line in the spectrum of Her X-1 attributed to cyclotron emission near the magnetic poles of the accreting neutron star. Expressions are derived for the absorption and redistribution functions, core and wing scattering and approximate scaling laws for the main frequency shift, path length and number of scatters, taking into account electron recoil and features arising from the one-dimensional dynamics of the scattering electrons. It is found that most line photons escape in the red wing, forming a single sharp feature rather than the twin-peaked absorption profile characteristic of resonance radiative transfer without electron recoil. Results are noted to be in agreement with the Her X-1 observations, and to imply a depth of the line-emitting layer of less than 10 g/sq cm for the observed line width.
Salpeter Edwin E.
Wasserman Ira
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