Computer Science
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349...51z&link_type=abstract
Nature (ISSN 0028-0836), vol. 349, Jan. 3, 1991, p. 51-54. Research supported by NASA and NSF.
Computer Science
53
Aluminum 26, Carbonaceous Chondrites, Grain Size, Interstellar Matter, Murchison Meteorite, Nuclear Fusion, Novae, Red Giant Stars, Wolf-Rayet Stars, Meteorites, Isotopes, Aluminum 26, Grains, Murchison, Cm2 Chondrites, Samples, Meteorite, Composition, Graphite, Silicon Carbide, Hypotheses, Chondrites, Stony Meteorites, Anomalies, Abundance, Magnesium 26, Origin, Formation, Decay, Isotopic Ratios, Nitrogen, Condensation, Aluminum Nitride, Nucleosynthesis
Scientific paper
It is reported here that interstellar graphite and SiC grains recovered from the Murchison CM2 chondritic meteorite have large abundances of Mg-26 from the decay of extinct Al-26. The deduced initial Al-26/Al-27 ratios range up to 0.06 in graphite and 0.2 in SiC. This is 1200 to 4000 times the maximum values found in refractory inclusions in primitive meteorites. All proposed stellar sources of carbonaceous dust also produced Al-26, but the highest Al-26/Al-27 ratios found in these grains seem to rule out Wolf-Rayet stars and supernovae. The aluminum abundance correlates with that of nitrogen, suggesting that the aluminum condensed as aluminum nitride.
Amari Sachiko
Anders Edward
Lewis Randy
Zinner Emst
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