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| Paper: |
PACS Spectroscopy of OH/IR Stars |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
341 |
| Authors: |
Lombaert, R.; de Vries, B. L.; Decin, L.; Blommaert, J.; Royer, P.; De Beck, E.; de Koter, A.; Waters, L. B. F. M. |
| Abstract: |
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 Observatory 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 code 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. |
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