Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-11-19
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Conference proceedings: "Why Galaxies Care About AGB Stars 2", Vienna 2010
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. The PACS spectrometer on-board the Herschel Space Telescope, provides for the first time the spectral resolution and sensitivity necessary to trace these lines. We report on the first modelling efforts of a PACS spectral scan for the OH/IR star V669 Cas. Central to our methodology is the consistent treatment of both dust and gas by using a line radiative transfer and a continuum radiative transfer code conjointly. Water emission lines are found to be extremely sensitive to the dust-to-gas ratio, emphasizing the need of consistent modelling for dust and gas.
Beck E. de
Blommaert Joris A. D. L.
de Koter Alex
de Vries Bernard L.
Decin Leen
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