The Contribution Of Radiation Pressure To The Stability Of A Standard Thin Keplerian Accretion Disk Around A Neutron Star With Axisymmetric Magnetic Field Dipole

In this thesis, we have studied the dynamic properties of an accretion disk formed fromrnthe inrnow of plasma from a blotted out companion star. The disk extends from an innerrnradius of 106m ( RA Alfeven radius) to 100RA (see gure 1.4). We have dividedrnthe disk into three regions: an outer region dominated by gas pressure and free-freernopacity, a middle region dominated by gas pressure and electron scattering, and an innerrnregion dominated by radiation pressure and electron scattering. We have also derivedrnthe radiation pressures and gas pressure in the inner region of the disk as a function ofrn"r" using radial dependence of the central temperature and the density. The latter wasrnobtained using the basic equations for thin accretion in non-relativistic case . Analysesrnof the instability of the disk is made between RA and 10RA (RA < r < 10RA) based onrnthe instability condition ( o > 3=5). This is occurred at high temperature, at which thernopacity is dominated by electron scattering and radiation pressure is strong

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