Accretion discs around neutron stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Disk Galaxies, Luminosity, Neutron Stars, Star Clusters, X Ray Sources, Celestial Bodies, Supernova Remnants, X Ray Astronomy, X Ray Spectra

Scientific paper

Observational evidence for discs in the compact X-ray sources and the evidence disc behavior are discussed and ways theoretical arguments can put limits or cast doubt on some of the empirical models put forward to explain the observations are considered. The disc structure itself is not important as long as it deposits matter on the neutron star at a sufficient rate to produce the X-ray flux. In the outer disc regions, the main disc luminosity comes from absorption and reradiation of X-ray photons and not from the intrinsic, viscously produced, local energy production rate. It is indicated that in the compact binary X-ray sources confrontation between disc theory and observations is not generally practicable.

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