Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.136..133p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 136, no. 1, Aug. 1987, p. 133-148.
Astronomy and Astrophysics
Astrophysics
9
Light (Visible Radiation), Near Infrared Radiation, Optical Properties, Silicates, Stellar Envelopes, Astronomical Models, Cosmic Dust, Red Giant Stars, Supergiant Stars, Temperature Dependence
Scientific paper
The results of Papoular and Pegourie (1983) and Pegourie and Papoular (1985) on modeling the IR emission of a sample of O-rich giants and supergiants are used to deduce the optical properties of circumstellar silicates in the visible and the near-IR. It is shown that the energy balance between the total energy radiated by the shell and that which it absorbs from the star makes it possible to stongly constrain the optical properties of the grain material and to determine the refraction index. Planck mean efficiencies both for emissivity and radiation pressure are calculated for the temperature and grain radius ranges of interest for computations of a red giant environment.
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