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Atypical magnesium abundances in oxygen-rich stardust:
NanoSIMS and Auger analyses.
Vollmer C., Stadermann F. J., Floss C., Hoppe P., and Brenker
F. E. (2008)
Meteorit. Planet. Sci. 43 (7, Suppl.), A164.
ABSTRACT
Astronomical observations indicate that silicates are the
major dust component of O-rich red giant stars. The Mg/Si and Mg/Fe
abundance ratios in these circumstellar shells are of particular
interest, as they strongly influence the types of dust to condense.
These data can be tested on Earth by high precision laboratory analyses
of presolar silicates found within primitive Solar System materials.
Auger spectroscopy is a powerful tool to study the chemistry of these
stardust grains on a <30 nm scale. It has been used to analyze rare
presolar grain types and also allows characterization of composite
phases. Here we report on results from combined NanoSIMS/Auger
measurements on O-rich stardust from the Acfer 094 meteorite.
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