Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Envelope density pattern around wide binary AGB stars: a dynamical model   The goal is to build up a simple dynamical model for the out-flowing
circumstellar envelope around AGB stars in a wide binary system to explore the
parameter dependence of the geometrical characteristics of column density
patterns. An AGB star in a wide binary system is considered as a 3-D piston
model that can induce a 3-D quasi-spherical density structure in the
circumstellar envelope by orbital motion of the AGB star. The column density
pattern only depends on two parameters: eccentricity of the orbit e and the
terminal outflow velocity to mean orbital velocity ratio gamma. When viewed
perpendicular to the orbital plane, spiral, broken spiral, and incomplete
concentric shell patterns can be seen, while when viewed along the orbital
plane, alternative concentric half-shell, egg-shell, and half-shell half-gap
patterns will develop. Non-zero eccentricity causes asymmetry, while larger
gamma makes a weaker pattern and helps bring out asymmetry. A spiral pattern
may becomes broken when e > 0.4. The spiral center is always less than 12% of
spiral pitch away from the orbit center. One should have more chances (~ 80%)
seeing spiral-like patterns than seeing concentric shells (~ 20%) in the
circumstellar envelope of wide binary AGB stars.

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The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys