On hard X-ray spectra of accreting neutron stars

Details On hard X-ray spectra of accreting neutron stars On hard X-ray spectra of accreting neutron stars

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..83...81z&link_type=abstract

Astrophysics and Space Science, vol. 83, no. 1-2, Apr. 1982, p. 81-103.

Other

9

Neutron Stars, Pulsars, Stellar Mass Accretion, Stellar Spectra, X Ray Sources, X Ray Spectra, Astronomical Models, Bremsstrahlung, Cyclotron Radiation, Gamma Ray Bursts, Isothermal Processes, Line Spectra, Stellar Magnetic Fields

Scientific paper

An analysis of the formation of the spectra of X-ray pulsars and gamma bursters shows that formation of radiation in line and in continuum occurs in the layers where the polarization of modes is determined by a polarized vacuum rather than by a plasma. An analysis of the isothermal model of a polar hot spot on X-ray pulsars indicates that the primitive account of the influence of the magnetic field on bremsstrahlung absorption and nonresonant scattering coefficients leads to the formation of wide wings of the cyclotron lines. The spectra of gamma bursters recorded by Venus 11 and 12 are interpreted in terms of a two-layer model of a polar hot spot, the upper cold layer being responsible for the cyclotron line in absorption, and the lower hot layer for the hard X-ray and gamma continuum. The accreting column is responsible for the deficit of hot spot radiation due to cyclotron scattering in gyro-resonant layers. Finally, the problem of measuring the magnetic fields of neutron stars taking into account the gravitational redshift and quantum recoil effect in emission and in absorption is discussed.

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