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We have performed stability analysis of axisymmetric accretion mounds onneutron stars in High Mass X-ray Binaries (HMXB) by 2-D MHD simulations withthe PLUTO MHD code. We find that the mounds are stable with respect tointerchange instabilities, but addition of excess mass destabilizes theequilibria. Our simulations confirm that accretion mounds are unstable withrespect to MHD instabilities beyond a threshold mass. We investigate bothfilled and hollow mounds and the for the latter also compute the expectedprofile of cyclotron resonance scattering features (CRSF). In comparison toCRSF from filled mounds reported in our earlier work, hollow mounds displaywider and more complex line profiles.

MHD instabilities in accretion mounds - 1: 2D axisymmetric simulations