Browsing by Author "Berhane, Berzaf"

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    The contribution of Degenerate Electron pressure to the Stability of thin keplerian Accretion Disks around a Neutron Star with Axisymmetric Magnetic Dipole
    (Addis Ababa University, 2013-04) Berhane, Berzaf; Wotro, Legesse (PhD)
    The stability analysis of a geometrically thin, gas-pressure dominated accretion disk around a neutron star is presented.We have also derived the electron degenerate pressures and gas pressure in the middle and outer regions of the disk as a function of r using radial dependence of the central temperature and the density. The latter was obtained using the basic equations for thin accretion in non-relativistic case. The stability is analyzed at a small temperature, that is temperature approaching zero and at nite temperature. The contribution of both fully and partially degenerate electrons for the stability of the disk in its middle and outer regions are investigated. We nd that the disk is stable in these regions, where the gas pressure is more dominant than radiation pressure