Browsing by Author "Hagos, Gereziher"

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    The Contribution of Coulombic Pressure to the Stability of thin Keplerian Accretion Discs around a Neutron Star with Axisymmetric Magnetic Dipole
    (Addis Ababa University, 2011-06) Hagos, Gereziher; Wetro, Legesse (PhD)
    We determine the stability of an axisymmetric geometrically thin and optically thick accretion disc around a magnetized neutron star in the region where gas pressure is dominant. Analysis is made with the inclusion of pressure from coulombic sources. The opacity in the middle region is mainly due to electron scattering whereas that in the outer region is mainly due to free-free emission. Starting from the vertically integrated non-relativistic hydrodynamics equations we set up the basic equations which govern the structure of the disc and for the stability analysis of the disc model we have kept the time dependencies in the equations. Although we include the e ect of coulombic pressure it is thermally stable as if there were gas pressure only and our graphical solution given at the end of this manuscript shows that the disc is viscously unstable