Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218..169o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 169-179. Research supported by ASTRON.
Astronomy and Astrophysics
Astronomy
119
Infrared Astronomy Satellite, Infrared Stars, Mira Variables, Stellar Envelopes, Stellar Mass Ejection, Aluminum Oxides, Condensation, Far Infrared Radiation, Hydroxyl Emission, Light Curve, Shock Waves, Silicates
Scientific paper
A study of low-resolution IRAS spectra for a sample of 109 M Mira variables confirms the previous suggestion that stars whose spectra show the 9.7-micron silicate emission feature have asymmetric light curves. The observed spectra are found to be well reproduced by models of optically thin spherical shells containing mixtures of amorphous magnesium silicate and aluminum oxide dust particles. The broad 12-micron feature observed in the spectra of stars without the 9.7-micron feature is associated with aluminum oxide particles. Model results imply that silicate dust condenses at low temperatures far out in the circumstellar shell, suggesting that mantle growth on preexisting aluminum oxide particles is the major process responsible for silicate formation.
de Jong Teije
Onaka Takashi
Willems Frits J.
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