Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..965n&link_type=abstract
Lunar and Planetary Science, volume 27, page 965
Computer Science
3
Corundum, Imaging: Ion, Isotopes: Oxygen, Nucleosynthesis, Stars: Red Giants
Scientific paper
As part of our ongoing efforts to enumerate the compositions and stellar sources of presolar oxide grains in meteorites, we used ion-imaging to locate forty new circumstellar Al2O3 grains in a residue of the Tieschitz (H3.6) meteorite. We located an additional 8 presolar grains by direct high-mass-resolution measurements in the ion microprobe, including several that would have been missed by isotopic ratio ion-imaging. Most of the grains have O-isotopic compositions and inferred initial 26 Al/27 Al ratios that lie within previously observed ranges, and are reasonably well explained by models of nucleosynthesis in red giant stars. One grain has an 16 O/17 O ratio of 71, much lower than any previously observed, and also lower than current theoretical predictions for stellar nucleosynthesis. Although the total number of presolar oxide grains identified in meteorites is approaching one hundred (out of some 5 x 10^4 measured grains), none have the extreme excesses in 16 O needed to explain the O-isotopic compositions of CAIs.
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