Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..335p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 335-346.
Astronomy and Astrophysics
Astrophysics
41
Grain Size, Infrared Spectra, M Stars, Particle Size Distribution, Silicates, Stellar Envelopes, Stellar Spectra, Cosmic Dust, Granular Materials, Stellar Spectrophotometry, Supergiant Stars
Scientific paper
A study of the IR excess from circumstellar dust (CS) shells of early oxygen-rich M supergiants leads to the definition of a complex index of refraction which is characteristic of the dust in these shells. This index can be used to simulate the IR excess from shells of various M stars, provided that an adequate grain radius is taken in each case. It appears that large, amorphous SiO4Mg2 grains develop in the inner parts of cool M giant shells, while grain sizes smaller than 1 micron are indicated for supergiants. In the outer and cooler regions of CS shells, the grains are smaller than about 0.3 microns, and are mostly made up of amorphous SiO3Mg. Grain size clearly increases with distance from the galactic plane, perhaps indicating a strong erosion process which is more or less confined to the galactic disk.
Papoular Renaud
Pégourié Bernard
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