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http://hdl.handle.net/123456789/3740
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| 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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