Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440204c&link_type=abstract
American Astronomical Society, AAS Meeting #214, #402.04; Bulletin of the American Astronomical Society, Vol. 41, p.663
Astronomy and Astrophysics
Astronomy
Scientific paper
The C/O ratio of dust-forming regions around AGB stars is one of the factors in determining the astromineralogy of the dust. It has been suggested that expected variation in the C/O ratio even within O-rich environments should cause subtle changes in the condensation sequence. Such changes will manifest themselves in the spectral features associated with these environments. We are investigating this hypothesis by studying the relationship between C/O ratio and the parameters of the 10 and 18 micron silicate emission feature in the spectra of O-rich AGB and post-AGB (and RSGs). C/O ratio values have been both collated directly from the literature and estimated using abudance data from the literature. The spectra data were obtained from IRAS-LRS and ISO-SWS archives. The parameters of the 10 and 18 micron silicate features (e.g.: peak wavelength, FWHM, etc) have been determined using a variety of techniques including continuum fitting. Preliminary results will be presented.
Chan Josephine S.
Speck Angela
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