Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4490c&link_type=abstract
HST Proposal ID #4490
Other
Hst Proposal Id #4490
Scientific paper
We propose observations of the K5 III star Alpha Tau using the Goddard High-Resolution Spectrograph (GHRS), to follow-up on the exciting initial SAO observations of this star and the SV observations of the K5 III hybrid star Gamma Dra. These data will also allow a detailed comparison of its spectrum and the thermodynamic properties of its outer atmosphere with those of the cooler M giant and supergiant stars Gamma Cru and Alpha Ori, observed during previous cycles. We shall check for variations in the C II downflow discovered in the SAO observations and search for evidence of systematic flows in other emission lines. We shall make detailed comparisons of the chromospheric emission lines and wind signatures in the UV spectra of two stars of the same spectral class, where one is a hybrid and one is not. We shall search for evidence of shocks and/or propagating waves in the line variations predicted by our recent calculations. We will also determine the variation of wind velocity with height using semi-empirical non-LTE models assuming spherical symmetry, search for evidence of circumstellar and interstellar absorptions on resonance lines of O I, Fe II, and Mg II, and compare the short-wavelength continuum measured in this star with that detected in observations of Gamma Dra, Gamma Cru and Alpha Ori.
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