Where's the Disk?: LBV bubbles and Aspherical Fast Winds

Abstract

Previous studies have explained the shapes of LBV nebulae, such as eta Car, by invoking the interaction of an isotropic fast wind with a previously deposited, slow aspherical wind (a "slow torus"). In this work I focus on the opposite scenario where an aspherical fast wind expands into a previously deposited isotropic slow wind. Using high resolution hydrodynamic simulations which include the effects of radiative cooling I have completed a series of numerical experiments to test if and how aspherical fast winds effects wind blown bubble morphologies. The simulations demonstrate that aspherical fast winds can produce strongly bipolar outflows and recover some important aspects