Computer Science
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978m%26p....18..441v&link_type=abstract
Moon and the Planets, vol. 18, June 1978, p. 441-446.
Computer Science
8
Abundance, Carbon Isotopes, Comets, Interstellar Matter, Stellar Atmospheres, Carbon 12, Carbon 13, Chemical Evolution, Galactic Evolution, Red Giant Stars, Solar System
Scientific paper
The C-12/C-13 isotope ratio in the interstellar medium and in stellar atmospheres is discussed and compared to the value found in the solar system and especially in comets. The cometary value (at least 100) tends to be slightly above the terrestrial value and is definitely higher than that for interstellar molecular clouds (about 30 to 50). This result implies that comets are not of interstellar origin; that the 'original' isotopic abundances of the primitive solar nebula have been preserved in the cometary material; and that due to an enrichment of the interstellar medium in C-13, the C-12/C-13 isotope ratio has decreased by a factor of about 2.5 since the formation of the solar system (i.e., during the past 4.5 billion years)- a result which is roughly in agreement with present theories of the chemical evolution of the Galaxy. The relatively high cometary carbon isotope ratio (as compared to the terrestrial value) indicates that some correction should be applied to the semiempirical models describing the C-13 enrichment in the Galaxy.
Rahe Juergen
Vanysek Vl.
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