The first ISO workshop on analytical spectroscopy with SWS, LWS, PHT-S and CAM-CVF

(Oct 6-8, 1997, Madrid, Spain)

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Dust and Molecular Features in the SWS spectra of C-rich AGB Stars:
Models and Observations

J. Hron 1 - R. Loidl 1 - W. Windsteig 1 - F. Kerschbaum 1 - S. Höfner 2 - U.G. Jørgensen 2

1 Institut für Astronomie, Universität Wien, Vienna, Austria -
2 Niels Bohr Institute, University of Copenhagen, Denmark

We discuss the importance of proper synthetic spectra for interpreting the molecular and dust emission observed in ISO-SWS data. First we compare synthetic molecular spectra with observed SWS spectra for C-rich AGB stars, corrected for the dust contribution by means of blackbody fits. Then first results for synthetic spectra containing the molecular and the dust component are presented. These are obtained from a combination of improved model spectra for the molecular component with radiative transfer calculations for the circumstellar dust envelope. Both types of synthetic spectra are based on the same dynamical model atmospheres. The application to O-rich stars is briefly discussed.

We also present results on the internal agreement between SWS spectra taken at similar pulsational phases and the external agreement with (quasi)simultaneous ground based photometry

This work was supported by the Fonds zur Förderung der wissenschaftlichen Forschung under Projects S7308-AST and S7305-AST.

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