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Paper: On the Central Symmetry of the Circumstellar Envelope of RS Cnc
Volume: 497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time
Page: 133
Authors: Nhung, P. T.; Hoai, D. T.; Winters, J. M.; Darriulat, P.; Gérard, E.; Le Bertre, T.
Abstract: We present a phenomenological study of CO (1-0) and CO (2-1) emission from the circumstellar envelope (CSE) of the AGB star RS Cnc. It reveals departures from central symmetry that turn out to provide a new tool for the exploration of some of the CSE properties. We use a wind model including a bipolar flow with a typical wind velocity of ∼8 km s-1, decreasing to ∼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 the 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 CSE 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 for the moment.
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