Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..671s&link_type=abstract
Astrophysical Journal, vol. 198, June 15, 1975, pt. 1, p. 671-682.
Astronomy and Astrophysics
Astrophysics
106
Adiabatic Conditions, Neutron Stars, Shock Fronts, X Ray Sources, Astronomical Models, Galactic Radiation, Gamma Rays, Magnetohydrodynamic Stability, Mass Transfer, Plasma Dynamics, Radiation Spectra, Steady Flow, Thermalization (Energy Absorption)
Scientific paper
The accretion of gas onto a neutron star is examined for the case in which a strong adiabatic shock front forms above the stellar surface to decelerate the incident plasma stream. Steady-state spherically symmetric flow is considered, all magnetic fields are ignored, and rapid thermalization by plasma instabilities in the shock front is assumed. The dynamic and thermal structure of the emission zone between the surface and the shock front is determined, and the emergent radiation spectrum is calculated. In many cases an appreciable fraction (about one-quarter) of the total energy is emitted in the form of gamma-ray photons between 1 and 10 MeV. The possible relevance of the model calculations to observations of galactic X-ray sources and gamma-ray bursts is discussed.
Salpeter Edwin E.
Shapiro Stuart L.
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