Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725012s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The most important factors influencing the mineralogy of dust forming in circumstellar outflows are density, temperature and chemical composition of the outflowing gas. We have tested the hypothesis that small variations in C/O ratio can explain subtle changes in the mineralogy of circumstellar dust by studying a sample of O-rich AGB stars of known C/O. We show that while C/O has little to no effect on the IR spectral features, the abundance of iron-group elements has a significant effect.
Our results imply that the details of chemical enrichment of the universe, rather than simply increasing ``metal'' abundances, play a significant role in determining what sort of dust should form when and where. This has implications for dust formation at high redshift.
Chan Sheffan
Speck Angela
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