SiC grains and evolution of carbon stars

Details SiC grains and evolution of carbon stars SiC grains and evolution of carbon stars

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..831l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 831-841

Astronomy and Astrophysics

Astrophysics

35

Abundance, Carbon Stars, Extinction, Silicon Carbides, Stellar Envelopes, Stellar Evolution, Stellar Models, Absorptance, Data Reduction, Dust, Local Thermodynamic Equilibrium, Radiative Transfer, Spectrum Analysis

Scientific paper

A set of 32 carbon stars enevelopes in a large range of spectral types has been modeled. The models were performed with two kinds of grains: SiC and amorphous carbon. Contrary to our previous study each kind of grain may be formed now at different distances from the central star. Correlations between SiC/A.C. ratio abundance and extinction opacity as well as SiC/A.C. ratio and period of luminosity were found. These correlations may indicate that the quantity of SiC grains relative to amorphous carbon grains decreases with carbon star evolution. A modification in SiC feature with increasing extinction opacity seems to be connected to this evolution.

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