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Chemical evolution of OB associationsIt is determined that the existence of Al-26 and Pd-107 in meteorites in the early solar system indicates that our solar system probably formed inside an OB association that had been contaminated by the debris of at least one supernova. In addition to these radioactive tracers, the contamination of the material out of which the solar system formed would have significantly enriched the heavy element composition of the solar system relative to that of the average interstellar medium. It is found that the solar system would be enriched in those isotopes which are produced by the more massive stars, such as O-16, C-12, Ne-20, and some other r-process material. It is proposed that specific isotopic ratios and elemental ratios reflecting these differences would include the Ne-20/Ne-22 ratio, which would be higher in the solar system than in the interstellar medium and the cosmic rays, the C-12/C-13 ratio which would be higher in the solar system than in the interstellar medium, and the oxygen-to-carbon ratio, which would also be higher in the solar system than in the typical interstellar medium.
Document ID
19830058508
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schramm, D. N.
(Chicago, University Chicago, IL, United States)
Olive, K. A.
(European Organization for Nuclear Research Geneva, Switzerland)
Date Acquired
August 11, 2013
Publication Date
October 15, 1982
Subject Category
Astrophysics
Accession Number
83A39726
Funding Number(s)
CONTRACT_GRANT: NSG-7212
CONTRACT_GRANT: NSF AST-81-16750
Distribution Limits
Public
Copyright
Other

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