Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Formation and Evolution of Wind-Capture Disks In Binary Systems   We study the formation, evolution and physical properties of accretion disks
formed via wind capture in binary systems. Using the AMR code AstroBEAR, we
have carried out high resolution 3D simulations that follow a stellar mass
secondary in the co-rotating frame as it orbits a wind producing AGB primary.
We first derive a resolution criteria, based on considerations of Bondi-Hoyle
flows, that must be met in order to properly resolve the formation of accretion
disks around the secondary. We then compare simulations of binaries with three
different orbital radii (10, 15, 20 AU). Disks are formed in all three cases,
however the size of the disk and, most importantly, its accretion rate
decreases with orbital radii. In addition, the shape of the orbital motions of
material within the disk becomes increasingly elliptical with increasing binary
separation. The flow is mildly unsteady with "fluttering" around the bow shock
observed. The disks are generally well aligned with the orbital plane after a
few binary orbits. We do not observe the presence of any large scale, violent
instabilities (such as the flip-flop mode). For the first time, moreover, it is
observed that the wind component that is accreted towards the secondary has a
vortex tube-like structure, rather than a column-like one as it was previously
thought. In the context of AGB binary systems that might be precursors to
Pre-Planetary and Planetary Nebula, we find that the wind accretion rates at
the chosen orbital separations are generally too small to produce the most
powerful outflows observed in these systems if the companions are main sequence
stars but marginally capable if the companions are white dwarfs. It is likely
that many of the more powerful PPN and PN involve closer binaries than the ones
considered here. The results also demonstrate principles of broad relevance to
all wind-capture binary systems.

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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin