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Circumstellar H2O in M-type AGB stars

Published online by Cambridge University Press:  01 February 2008

Matthias Maercker ,
Fredrik L. Schöier  and
Hans Olofsson
Matthias Maercker
Affiliation:
Stockholm Observatory, AlbaNova University Center, 106 91 Stockholm, Sweden email: maercker@astro.su.se
Fredrik L. Schöier
Affiliation:
Onsala Space Observatory, 439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
Hans Olofsson
Affiliation:
Onsala Space Observatory, 439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
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Abstract

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Surprisingly high amounts of H2O have recently been reported in the circumstellar envelope around the M-type AGB star W Hya. However, substantial uncertainties remain, as the required radiative transfer modelling is difficult due to high optical depths, sub-thermal excitation and the sensitivity to the combined radiation field from the central star and dust grains.

Keywords

Stars: AGB and post-AGBcircumstellar mattermass loss
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 163 - 164
Copyright
Copyright © International Astronomical Union 2008

References

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