Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the central symmetry of the circumstellar envelope of RS Cnc   We present a phenomenological study of CO(1-0) and CO(2-1) emission from the
circumstellar envelope (CSE) of the Asymptotic Giant Branch (AGB) star RS\,Cnc.
It reveals departures from central symmetry that turn out to be efficient tools
for the exploration of some of the CSE properties. We use a wind model
including a bipolar flow with a typical wind velocity of $\sim$8 km\,s$^{-1}$
decreasing to $\sim$2 km\,s$^{-1}$ near the equator to describe Doppler
velocity spectral maps obtained by merging data collected at the IRAM Plateau
de Bure Interferometer and Pico Veleta single dish radio telescope. Parameters
describing the wind morphology and kinematics are obtained, together with the
radial dependence of the gas temperature in the domain of the circumstellar
envelope probed by the CO observations. Significant north-south central
asymmetries are revealed by the analysis, which we quantify using a simple
phenomenological description. The origin of such asymmetries is unclear.

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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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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: physics
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con