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Millimeter Observations of Molecules in the Envelopes around Late-type Stars

Published online by Cambridge University Press:  25 May 2016

Michel Guélin ,
Robert Lucas ,
Roberto Neri ,
Michael Bremer  and
Dominique Broguière
Michel Guélin
Affiliation:
Institut de Radioastronornie Millimétrique, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
Robert Lucas
Affiliation:
Institut de Radioastronornie Millimétrique, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
Roberto Neri
Affiliation:
Institut de Radioastronornie Millimétrique, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
Michael Bremer
Affiliation:
Institut de Radioastronornie Millimétrique, 300 rue de la Piscine, F-38406 St Martin d'Hères, France
Dominique Broguière
Affiliation:
Institut de Radioastronornie Millimétrique, 300 rue de la Piscine, F-38406 St Martin d'Hères, France

Abstract

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The envelopes surrounding AGB stars are similar to interstellar dark clouds in many respects; opaque to the visible light, they are transparent to mm wavelengths. Several envelopes, close enough to be spatially resolved with mm-wave interferometers, exhibit a remarkably rich molecular content, which can then be studied in detail as a function of radius. Because the envelopes are in expansion, their outer layers are older and more evolved than the inner ones, making it possible, thanks to a relatively simple geometry, to probe the time-dependence of the ongoing chemical processes.

Type
Part 6. Chemistry in the Envelopes of Late-Type Stars
Information
Symposium - International Astronomical Union , Volume 197: Astrochemistry: From Molecular Clouds to Planetary Systems , 2000 , pp. 365 - 374
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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