Deceleration of infalling plasma in the atmospheres of accreting neutron stars. I - Isothermal atmospheres

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Deceleration, Neutron Stars, Plasma Dynamics, Stellar Atmospheres, Stellar Mass Accretion, Isothermal Processes, Protons, Pulsars, Stellar Magnetic Fields, Stellar Models

Scientific paper

This paper studies the physics of energy deposition in the highly magnetized atmosphere of an accreting neutron star. Specifically, it models proton stopping in plasma slabs of constant density and temperature. The calculations include both Coulomb collisions with atmospheric electrons and collective forces due to the resonant excitation of the atmospheric electron plasma modes by the impinging protons. The atmospheric protons do not contribute significantly to the stopping through electromagnetic forces. Attention is focused on the deceleration of the protons in the accretion flow, because they carry the bulk of the kinetic energy in the flow.

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