Accretion onto neutron stars with the presence of a double layer

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Neutron Stars, Plasma Layers, Pulsars, Stellar Mass Accretion, X Ray Binaries, Electron Density (Concentration), Kinetic Energy, Poisson Equation, Vlasov Equations

Scientific paper

It is known from laboratory experiments that double layers can form in plasmas, usually in the presence of an electric current. It is argued that a double layer may be present in the accretion column of a neutron star in a binary system. It is suggested that the double layer may be the predominant deceleration mechanism for the accreting ions, especially for sources with X-ray luminosities of less than about 10 to the 37th erg/s. Previous models have involved either a collisionless shock or an assumed gradual deceleration of the accreting ions to thermalize the energy of the infalling matter.

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