Where's the Doughnut? LBV bubbles and Aspherical Fast Winds

Details Where's the Doughnut? LBV bubbles and Aspherical Fast Winds Where's the Doughnut? LBV bubbles and Aspherical Fast Winds

1998-05-12

arxiv.org/abs/astro-ph/9805162v1

Astronomy and Astrophysics

Astrophysics

23 pages, 6 figures, to appear the Astrophysical Journal

Scientific paper

10.1086/305699

In this paper we address the issue of the origin of LBV bipolar bubbles. 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 paper we 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, we have completed a series of numerical experiments to test if and how aspherical fast winds effect wind blown bubble morphologies. Our experiments explore a variety of models for the latitudinal variations of fast wind flow parameters. The simulations demonstrate that aspherical fast winds can produce strongly bipolar outflows. In addition the properties of outflows recover some important aspects of LBV bubbles which the previous "slow torus" models can not.

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