SWS observations and model atmospheres of carbon- and oxygen-rich AGB variables

Details SWS observations and model atmospheres of carbon- and oxygen-rich AGB variables SWS observations and model atmospheres of carbon- and oxygen-rich AGB variables

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..365l&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 365

Computer Science

3

Agb Stars

Scientific paper

The ISO-SWS spectra of several representative carbon- and oxygen-rich AGB variables (R Aql, R Cas, T Dra, V Cyg, V CrB and R Scl) were obtained at several phases of their pulsational cycle. This allows us to study the molecular features and the dust emission of these objects as a function of stellar parameters as well as pulsational phase. The observational data are compared with synthetic molecular spectra based on hydrostatic models (MARCS) and on dynamical atmospheres, which include such phenomena as pulsation, mass loss and dust formation. Some aspects of the SWS spectra like their variations can only be explained by dynamical atmospheres. To be able to analyse also the targets with significant mass loss, we also included a dust component in the synthetic spectra. On the basis of these synthetic spectra we also investigate the influence of molecular features on the interpretation of the dust emission and vice versa. This is of special importance in the 8-16 μm region.

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