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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3740

Title: THE CONTRIBUTION OF COULOMBIC PRESSURE TO THE STABILITY OF THIN KEPLERIAN ACCRETION DISCS AROUND A NEUTRON STAR WITH AXISYMMETRIC MAGNETIC DIPOLE
Authors: GEREZIHER, HAGOS
Advisors: Dr. Legesse Wotro
Keywords: accretion disc
magnetized neutron star
Copyright: Jun-2011
Date Added: 8-Nov-2012
Publisher: AAU
Abstract: 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.
Description: A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN PHYSICS (ASTRONOMY)
URI: http://hdl.handle.net/123456789/3740
Appears in:Thesis - Physics

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