The Contribution Of Degenerate Electron Pressure To The Stability Of Thin Keplerian Accretion Disks Around A Neutron Star With Axisymmetric Magnetic Dipole

The stability analysis of a geometrically thin, gas-pressure dominated accretion diskrnaround a neutron star is presented.We have also derived the electron degenerate pressuresrnand gas pressure in the middle and outer regions of the disk as a function of r usingrnradial dependence of the central temperature and the density. The latter was obtained usingrnthe basic equations for thin accretion in non-relativistic case. The stability is analyzedrnat a small temperature, that is temperature approaching zero and at nite temperature.rnThe contribution of both fully and partially degenerate electrons for the stability of therndisk in its middle and outer regions are investigated. We nd that the disk is stable inrnthese regions, where the gas pressure is more dominant than radiation pressure

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