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Imaging the two wind post-AGB interaction in M 1-92

Published online by Cambridge University Press:  25 May 2016

J. Alcolea  and
V. Bujarrabal
J. Alcolea
Affiliation:
Observatorio Astronómico National, Apdo. 1143, E-28800 Alcalá de Henares, Spain
V. Bujarrabal
Affiliation:
Observatorio Astronómico National, Apdo. 1143, E-28800 Alcalá de Henares, Spain

Abstract

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M 1-92, Minkowski's Footprint, is a well studied protoplanetary nebula (PPN). Here we present high resolution observations of this object in atomic and molecular lines, as well as in the continuum, at optical and radio wavelengths. From these observations we conclude that the present bipolar nebula is the old AGB shell, strongly modified by the interaction with some powerful post-AGB bipolar ejections, which started suddenly about 900 years ago. The nature of these post-AGB ejections as well as its comparison with the present bipolar fast flow are discussed. We conclude that a mechanism different from photon pressure must be invoked in order to explain the morphology and dynamics of M 1-92 and other similar objects.

Type
Part 5. Non-Spherical Mass Loss, Binarity, Post-AGB Evolution
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 419 - 424
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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