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We present a phenomenological study of CO(1-0) and CO(2-1) emission from thecircumstellar envelope (CSE) of the Asymptotic Giant Branch (AGB) star RS\,Cnc.It reveals departures from central symmetry that turn out to be efficient toolsfor the exploration of some of the CSE properties. We use a wind modelincluding 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 Dopplervelocity spectral maps obtained by merging data collected at the IRAM Plateaude Bure Interferometer and Pico Veleta single dish radio telescope. Parametersdescribing the wind morphology and kinematics are obtained, together with theradial dependence of the gas temperature in the domain of the circumstellarenvelope probed by the CO observations. Significant north-south centralasymmetries are revealed by the analysis, which we quantify using a simplephenomenological description. The origin of such asymmetries is unclear.

On the central symmetry of the circumstellar envelope of RS Cnc