X-ray spectra of bursting neutron stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Absorptivity, Bursts, Compton Effect, Eddington Approximation, Electron Scattering, Hertzsprung-Russell Diagram, Luminosity, Neutron Stars, Newton-Raphson Method, Opacity, Photon Beams, Plancks Constant, Stellar Atmospheres, Stellar Mass Accretion, Thermonuclear Reactions, X Ray Spectra, Density Distribution, Nonlinear Equations, Stellar Evolution, Stellar Structure, Temperature Distribution, X Ray Astronomy

Scientific paper

The global properties of Type I X-ray bursts can be successfully accounted for by the thermonuclear shell flash model of accreting neutron stars. According to this model, the luminosity of a relatively large burst approaches the Eddington luminosity. Near the peak of a large X-ray burst density in the neutron star atmosphere is so low that electron scattering opacity dominates over absorptive opacity. In such a situation, the X-ray spectrum emitted by the neutron star surface is performed from Planck spectrum by Compton scattering. The atmospheric structure and the photon energy spectrum of the X-ray bursting neutron star is calculated taking into account such Comptonization. From the X-ray spectrum, theoretical color temperature luminosity diagram (analog of the Hertzsprung-Russell diagram) is obtained. Comparing the theoretical diagram with observations the mass radius relationships of neutron stars and their distances to the galactic center can be estimated.

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