Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7347d&link_type=abstract
HST Proposal ID #7347
Other
Hst Proposal Id #7347 Cool Stars
Scientific paper
We propose continuation of spatially resolved observations of Alpha Orionis { Betelgeuse; M2 Iab} during Cycles 7 and 8 for which we were originally approved in Cycle 6 {GO 6529}. Cycle 6 observations of Betelgeuse with the FOC are scheduled for October 1996 and March 1997. Our UV images of Alpha Orionis { Betelgeuse; M2 Iab} obtained with the FOC in 1995 {Cycle 5} are the first direct images of the surface of a star other than the Sun. The continuum images reveal a greatly extended atmosphere in the ultraviolet, with diameter of approximately 125 milliarcsec, about twice that in the visible. In addition, a bright unresolved spot is present in the south-western quadrant of the stellar disk. Spectra of the Mg, ii h&k lines obtained during Cycle 5 with the GHRS show enhanced emission in the spot, spatial extent beyond the continuum image to a diameter of at least 220 mas, and a general outflow in the chromosphere. The distribution of photospheric line shifts across the stellar disk reveals the rotation of the star, and suggests the UV spot is located at one of Betelgeuse's poles. We propose here to monitor Betelgeuse twice per year during Cycles 7 and 8 obtaining FOC images, and to use STIS to acquire spectra with higher spatial resolution and larger spectral range then previously available to map motions through the atmosphere, to document its variability, and to confirm our interpretation of the spot as a propagating atmospheric shock.
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