Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5409g&link_type=abstract
HST Proposal ID #5409
Other
Hst Proposal Id #5409 Cool Stars Atmospheres &Amp, Winds
Scientific paper
Alpha Orionis (Betelgeuse) is a large, bright supergiant star with an extended a tmosphere. We propose to image Alpha Ori in the ultraviolet continuum and chrom ospheric emission of Mg II using the FOC, and also to spectroscopically image th e star and its extended atmosphere in the Mg II emission lines in order to estab lish the ultraviolet diameter and limb-darkening, to discover the extent of the chromosphere, to detect surface and atmospheric features and to determine the dy namics of the atmosphere. This program will utilize the capability of the HST after correction by COSTAR t o produce the first direct, resolved ultraviolet image of a star other than the Sun. These observations will showcase the unique capability of HST for high res olution imaging and provide more direct constraints on the physical processes re sponsible for the structure of extended atmospheres than has been possible previ ously. Obtaining a high-fidelity image of Alpha Orionis in the ultraviolet will establish a new area of stellar physics research.
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