Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Growth and Dissipation of Be Star Discs in Misaligned Binary Systems   We use a three-dimensional smoothed particle hydrodynamics code to simulate
growth and dissipation of Be star discs in systems where the binary orbit is
misaligned with respect to the spin axis of the primary star. We investigate
six different scenarios of varying orbital period and misalignment angle,
feeding the disc at a constant rate for 100 orbital periods, and then letting
the disc dissipate for 100 orbital periods. During the disc growth phase, we
find that the binary companion tilts the disc away from its initial plane at
the equator of the primary star before settling to a constant orientation after
40 to 50 orbital periods. While the mass-injection into the disc is ongoing,
the tilting of the disc can cause material to reaccrete onto the primary star
prematurely. Once disc dissipation begins, usually the disc precesses about the
binary companion's orbital axis with precession periods ranging from 20 to 50
orbital periods. In special cases we detect phenomena of disc tearing, as well
as Kozai-Lidov oscillations of the disc. These oscillations reach a maximum
eccentricity of about 0.6, and a minimum inclination of about \ang{20} with
respect to the binary's orbit. We also find the disc material to have highly
eccentric orbits beyond the transition radius, where the disc changes from
being dominated by viscous forces, to heavily controlled by the companion star,
in contrast to its nearly circular motion inward of the transition radius.
Finally, we offer predictions to how these changes will affect Be star
observables.

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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg