Computer Science
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.332..702j&link_type=abstract
Nature (ISSN 0028-0836), vol. 332, April 21, 1988, p. 702-705. Research supported by the Danish Natural Science Research Council
Computer Science
35
Carbon Stars, Red Giant Stars, Stellar Atmospheres, Stellar Composition, Xenon Isotopes, Diamonds, M Stars, Supernova Remnants, Thermodynamic Equilibrium, Meteorites, Formation, Origin, Enrichment, Xenon, Diamond, Grains, Carbonaceous Chondrites, Chronology, Thermodynamics, Hypotheses
Scientific paper
It is shown here that the diamonds found in meteorites must have formed in the type of red giants called carbon stars, and that heavy and light isotopes of Xe (Xe-HL) and diamonds cannot have formed in the same star but must be produced one in each component of a close binary system. The diamonds are produced in the smaller of the components, near the end of its evolution; the Xe-HL is produced when the compact remnant of the bigger component has accreted so much mass from the carbon star that it explodes as a supernova. This is consistent with the normal evolution of type I supernovae (SN I), and it is demonstrated that there were appreciably more carbon stars participating in SN I formation at the time the solar system formed than today. The thermodynamic conditions under which the diamonds are produced are determined, and it is explained why Xe-HL is found in diamonds but not in silicon carbide, and why s-process Xe is expected to be found in silicon carbide.
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