Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5694j&link_type=abstract
HST Proposal ID #5694
Computer Science
Hst Proposal Id #5694 Cool Stars Stellar Atmospheres
Scientific paper
We propose to use the Goddard High-Resolution Spectrograph (GHRS) on the HST to obtain ultraviolet spectra of the visually bright N-type carbon star TX Psc. These spectra, obtainable only with HST, will be used with theoretical models to infer the density and temperature structure and the velocity fields of the outer atmosphere in these evolutionarily advanced, non-mira giants. In anticipation of this effort, we have pushed IUE to its limit to obtain a weak high-resolution spectra of this star, and observations of a second carbon star (UU Aur) with HST are being analyzed. 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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