Isotopic anomalies - Chemical memory of Galactic evolution

Details Isotopic anomalies - Chemical memory of Galactic evolution Isotopic anomalies - Chemical memory of Galactic evolution

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..191c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 191-195. Research supported by the Robert A. Welch Fo

Astronomy and Astrophysics

Astrophysics

57

Chemical Evolution, Galactic Evolution, Isotopes, Nuclear Astrophysics, Nuclear Fusion, Anomalies, Astronomical Models, Interstellar Matter, Reaction Products

Scientific paper

Because of the differing temporal evolution of primary and secondary products of nucleosynthesis, which is illustrated with a standard family of analytic models of chemical evolution, the isotopic composition of the bulk interstellar medium changes approximately linearly with time. Therefore, any dust component having an age different from that of average dust will be isotopicaly anomalous. The author gives three explicit and plausible mechanisms for this that do not rely on special stellar condensates, with special emphasis on C, O, Mg, and Si and on suggestive examples from meteoritic science: isotopically heavy average-stellar condensates of SiC and a correlation of excess 16O with aluminium.

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