MR. PRASANTA BERA

The strong internal Magnetic field of a degenerate star can provide a massive stellar configuration and deform its equilibrium structure to a non-spherical shape due to the presence of Lorentz force. This deformation in matter distribution is dependent on the internal field strength and the field geometry. Axisymmetric configurations with pure poloidal or pure toroidal field are expected to undergo evolution in their matter and field distribution in an unstable manner over the Alfven time, primarily due to azimuthal Tayler instability. We study linear and non-linear perturbation evolution of the axisymmetric configurations. The evolution of the perturbed equilibrium configuration in the linear regime is performed by the two step predictor-corrector MacCormack method. The non-linear stage of the evolution is investigated using the PLUTO numerical code. In both cases the growth of the perturbations show instability over a few Alfven times.