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 Telescope1,
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.
| Original language | English |
|---|---|
| Title of host publication | Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Editors | Lebzelter, T. Wing, R.F. Kerschbaum, F. |
| Place of Publication | San Francisco |
| Publisher | Astronomical Society of the Pacific |
| Pages | 309 |
| Number of pages | 1 |
| Publication status | Published - 2011 |