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The Neutral Envelopes around AGB and Post-AGB Objects

Their Structure and Kinematics

Published online by Cambridge University Press:  25 May 2016

H. Olofsson
H. Olofsson*
Affiliation:
Stockholm Observatory, S-l33 36 Saltsjöbaden, Sweden

Abstract

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This review discusses the large-scale geometry and kinematics of envelopes around evolved stars, as inferred from radio line observations of circumstellar molecules, as a function of the evolutionary stage of the central object. In particular, the drastic change in morphology from largely spherical envelopes around asymptotic giant branch stars to distinctly non-spherical neutral envelopes around planetary nebulae is addressed. In addition, the small-scale structure of the envelopes, i.e., whether the circumstellar medium is smooth or clumpy, is discussed. Finally, a scenario for the morphological evolution, based on the assumption of a highly clumped medium, is presented.

Type
Session IX — Circumstellar Emission and Environment
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 413 - 424
Copyright
Copyright © Kluwer 2000 

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