Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.239l&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of high-excitation molecular emission lines can greatly increase our understanding of AGB winds, as they trace the innermost regions of the circumstellar envelope. PACS, an IR instrument on the Herschel space telescope, provides for the first time the resolution and sensitivity necessary to trace these high excitation emission lines. Specifically, we report on the first modelling efforts of a spectral scan for the OH/IR star V669 Cas, where we include a consistent treatment of dust parameters during the line radiative transfer modeling of the gas component in the circumstellar envelope. Water emission lines are found to be extremely sensitive to the dust-to-gas ratio, emphasizing the need for a consistent treatment of dust and gas. Furthermore, we investigate the link between the molecular water abundance and the formation of water ice in the wind.
Beck E. de
Blommaert Joris A. D. L.
de Koter Alex
de Vries Bernard L.
Decin Leen
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