Other
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180..495r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 180, Sept. 1977, p. 495-524. Research supported by the Australian Resea
Other
13
Cosmic Dust, Infrared Radiation, Isothermal Processes, Stellar Envelopes, Stellar Models, Color-Color Diagram, Cool Stars, Graphs (Charts), Optical Thickness, Radiative Transfer, Spectral Emission
Scientific paper
An isothermal approach has been used to construct an extensive grid of circumstellar dust-shell models. The effect on the output spectrum of the stellar and shell temperatures and the optical depth of the shell is investigated for power opacity laws and silicate opacity laws. It is found that for silicate shells, there exists a large domain in which the 10- and 20-micron features are in absorption for all values of the stellar temperature and that the principal factor influencing whether the features are in emission or absorption is the shell temperature. In general, low shell temperatures give rise to absorption features, while high shell temperatures give rise to emission features. The model is compared with observations using a variety of color-color diagrams and a semiempirical silicate opacity law. It is found that the model accounts remarkably well for observations of cool stars with silicate emission features.
Hyland A. R.
Robinson Geoffrey
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