Computer Science – Numerical Analysis
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..567l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 2, p. 567-580
Computer Science
Numerical Analysis
32
Carbon Stars, Granular Materials, Numerical Analysis, Radiative Transfer, Silicon Carbides, Stellar Envelopes, Energy Distribution, Mira Variables, Stellar Evolution, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
The modeling of nine carbon-rich stars has been performed; some of these stars had already been modeled but for others this is the first model (W Ori, UU Aur, RY Dra, RY Mon). Amorphous carbon is chosen as the principal condensate and SiC grains are included. The temperature of the central star and some characteristics of the circumstellar shell, such as its extension and optical depth as well as the temperature of the grains throughout the envelope, were determined by fitting the flux curves. The contribution of each type of grain as well as the stellar one in the energy distribution have been studied. The flux due to SiC grains is small relative to the flux due to amorphous carbon grains which means that modeling without SiC grains is a reasonable first approximation. A correlation between the SiC/A.C. ratio and optical depth as well as mass loss rate was found for our sample.
Lefevre J.
Lorenz-Martins Silvia
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