Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979uta..rept.....l&link_type=abstract
Final Report Texas Univ., Austin.
Physics
M Stars, Stellar Spectra, Supergiant Stars, Absorption Spectra, Chromosphere, Fluorescence, Iron, Magnesium, Oao 3, Potassium, Stellar Envelopes, Ultraviolet Spectroscopy
Scientific paper
Copernicus observations of Mg 2 h and k emission lines from M giants and supergiants are described. Supergiants with extensive circumstellar gas shells show an asymmetric k line. The asymmetry is ascribed to superimposed lines of Fe 1 and Mn 1. The Mg 2 line width fit the Wilson-Bappu relation derived from observations of G and K Stars. Results of correlated ground-based observations include (1) the discovery of K 1 fluorescent emission from the Betelgeuse shell; (2) extimates of the mass-loss rates; and (3) the proposal that silicate dust grains must account for the major fraction of the Si atoms in the Betelgeuse shell.
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