Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725014k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.14; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
In order to study the effect of chemistry on the formation of dust around carbon-rich AGB stars, we have selected a sample of C-rich stars of known C/O ratio. Using radiative transfer (RT) modeling we determine the parameters of the dust shells of 8 carbon stars. In particular we focus on modeling the 11 micron SiC feature, and the overall shape of the spectral energy distribution (SED) while keeping other parameters (i.e. grain size distribution, relative shell thickness and dust density distribution) constant. This is done to ameliorate the problem of degeneracy within model parameters. In order to determine whether the relative abundances of SiC and carbon are related to the C/O ratio, we sought correlations between various physical, stellar and spectral parameters including effective stellar temperature, C/O ratio, modeled SiC abundance, pulsation period etc. We present our RT models and discuss the correlations between parameters or lack thereof.
Knoll Harrison
Speck Angela
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