Relic interstellar grains in Murchison meteorite

Details Relic interstellar grains in Murchison meteorite Relic interstellar grains in Murchison meteorite

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..544y&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Oct. 11, 1984, p. 544-547.

Astronomy and Astrophysics

Astrophysics

48

Carbon Isotopes, Interstellar Matter, Meteoritic Composition, Nitrogen Isotopes, Oxygen Isotopes, Deuterium, Grains, Histograms, Oxidation, Meteorites, Murchison, Grains, Samples, Meteorite, Isotopes, Analysis, Hydrogen, Carbon, Nitrogen, Origin, History, Isotopic Ratios, Phases, Distribution, Composition, Formation, Nucleosynthesis, Enrichment

Scientific paper

It is shown that, in the Murchison meteorite, the D/H ratios of hydrogen are unusually high in several separates and in one case up to 30 times the cosmic value of 2 x 10 to the -5th. Many phases show high C-13/C-12 ratios, up to 2.5 times the terrestrial value of 0.011. These C-13-rich and D-rich components of the two chemical elements are not correlated. They are heterogeneously distributed, suggesting that different components in the meteorite originated from different astrophysical sites and at different times. The D-rich hydrogen in the meteorite is probably due to molecules formed by ion-molecule reactions in interstellar clouds while the tiny amount of C-13-rich carbon is probably due to nucleosynthesis in red giant stars as suggested by Swart et al. (1983). Both of these heavy-isotope enriched components survived homogenization in the accumulation and subsequent history of the meteorites.

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