Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5359c&link_type=abstract
HST Proposal ID #5359
Computer Science
Hst Proposal Id #5359 Cool Stars Stellar Atmospheres
Scientific paper
We propose to use the Faint Object Spectrograph (FOS) and the Goddard High-Resolution Spectrograph (GHRS) on the HST to obtain ultraviolet spectra of visually bright N-type carbon stars and late M-giant stars. These spectra, obtainable only with HST, will be used with theoretical models to infer the temperature and density structure and the velocity fields of the outer atmosphere in these evolutionarily advanced, non-mira giants. In anticipation of this effort, we have already pushed IUE to its limit to obtain both low-resolution, and, where possible, high-resolution spectra of several M, S, and C stars, and these have been analyzed and published. Based upon the observed line profiles and continua, we will construct semi-empirical non-LTE models in both plane-parallel geometry and spherical geometry, including velocity fields, by attaching a chromosphere to theoretical photospheric models. Two-component models will be studied. Using these and ab-initio hydrodynamic models, we will examine the mechanisms responsible for chromospheric heating and mass loss. A full range of supporting ground-based observations will be undertaken to permit us to connect models of the photospheres, chromospheres, and circumstellar shells.
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