A study of the angular diameters of dust shells around red giants

Details A study of the angular diameters of dust shells around red giants A study of the angular diameters of dust shells around red giants

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991wula.rept.....d&link_type=abstract

Final Report, 1 Nov. 1987 - 31 Oct. 1990 Wyoming Univ., Laramie. Dept. of Physics and Astronomy.

Astronomy and Astrophysics

Astronomy

Cosmic Dust, Diameters, Red Giant Stars, Silicates, Stellar Envelopes, Stellar Spectra, Opacity, Oxygen Spectra, Shells (Structural Forms)

Scientific paper

A summary of observations of the angular diameters of the shells around evolved red giants is reported. Many of these sources are partially resolved with a ground based 2.4 m telescope. The 8 to 13 micron spectral range was examined because this corresponds to the emission excesses observed in the spectra of oxygen-rich stars. These excesses are commonly thought to arise from small silicate mineral grains in the circumstellar shells. The shell structure was fully resolved for the bright supergiant alpha Orionis. A study of the results shows that the opacity of the silicate mineral grains around that star is similar to that inferred for other evolved stars and for the Trapezium.

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