Model atmospheres and X-ray spectra of bursting neutron stars

• DOI: 10.1051/0004-6361:20034048
• Publication Date: 2005-01-20T18:49:22Z
• Authors: A. Majczyna; J. Madej; P. C. Joss; A. Różańska
• Keywords: Opacity; Radiative equilibrium; Black-body radiation

This paper presents the set of plane-parallel model atmosphere equations for a very hot neutron star (X-ray burst source). The assume both hydrostatic and radiative equilibrium, equation state an ideal gas in local thermodynamic equilibrium (LTE). transfer includes terms describing Compton scattering photons on free electrons fully relativistic thermal motion, photon energies approaching . Model take into account many bound-free free-free energy-dependent opacities hydrogen, helium, iron ions, also dozen bound-bound highest ions iron. We solve by partial linearisation technique variable Eddington factors. Large grid H-He-Fe atmospheres X-ray sources has been computed K, wide range surface gravity, various abundances. demonstrate that spectra bursters with present accreting matter differ significantly from pure H-He (published earlier paper), blackbody spectra. Comptonized significant abundance are generally closer to than atmospheres. ratio color effective temperatures our always remains theoretical will be used determine temperatures, radii ratios bursting stars observational data.