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Paper: AGB Mass-Loss Characteristics: Rates, Temporal Variations, and Geometries
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 253
Authors: Schöier, F. L.; Ramstedt, S.; Maercker, M.; Olofsson, H.
Abstract: The successful modelling (at various degrees of sophistication) of circumstellar emission from the vast majority of AGB stars, assuming a spherically symmetric envelope, suggests that pronounced axi- or non-symmetric mass loss is not a common phenomenon among AGB stars. Significant deviations from spherical symmetry have been detected which, in at least some cases, might be an effect of a binary system. Temporal modulations of the mass-loss rate are also present, at least during the later carbon star evolutionary phase, where (more or less periodic) variations are observed on various time-scales. We present a summary of the various morphological structures observed around AGB stars and their interpretation based on radiative transfer modelling.
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