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Probing chemical processes in AGB stars

Published online by Cambridge University Press:  01 February 2008

Fredrik L. Schöier  and
Hans Olofsson
Fredrik L. Schöier
Affiliation:
Onsala Space Observatory, SE-439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
Hans Olofsson
Affiliation:
Onsala Space Observatory, SE-439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
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Abstract

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We are conducting multi-transition observations of circumstellar line emission from common molecules such as HCN, SiO, CS, SiS and CN for a large sample of AGB stars with varying photospheric C/O-ratios and mass-loss charachteristics. Our recently published results for SiO and SiS clearly show that major constraints on the relative roles of non-equilibrium chemistry, dust condensation, and photodissociation can be obtained from the study of circumstellar molecular line emission. Presented here are also preliminary results based on detailed radiative transfer modelling of HCN line emission.

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. 201 - 206
Copyright
Copyright © International Astronomical Union 2008

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