Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..490c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 490-498. Research supported by the Robert A. Welch Fo
Astronomy and Astrophysics
Astrophysics
20
Cosmochemistry, Interstellar Matter, Magnesium Isotopes, Meteoritic Composition, Abundance, Aluminum Isotopes, Cosmic Dust, Gamma Rays
Scientific paper
The author demonstrates that the surprisingly large amount of 26Al detected in the interstellar medium by its gamma-ray emission implies that interstellar dust should carry in bulk a fossil anomaly at the level 26Mg*/Al = 0.027, regardless of the chemical structure of that dust. It is proposed that 26Mg* enrichment occurs during 26Al decay in the aluminum-bearing portions of interstellar dust, that it primarily does so much earlier in the grains' histories when a higher 26Al/27Al ratio existed in the dust than exists in the steady state today, that a correlation of 26Mg* with Al much larger than the correlation found in meteorites is thereby established in interstellar dust, and that this 26Mg*/Al correlation may have been chemically remembered when the CaAl-rich inclusions are later assembled. The major uncertainty with this scenario is the nature and degree of aluminum condensation during stellar ejection.
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