Abstract
view Abstract Citations (142) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interstellar Grains within Interstellar Grains Bernatowicz, Thomas J. ; Amari, Sachiko ; Zinner, Ernst K. ; Lewis, Roy S. Abstract Five interstellar graphite spherules extracted from the Murchison carbonaceous meteorite are studied. The isotopic and elemental compositions of individual particles are investigated with the help of an ion microprobe, and this analysis is augmented with structural studies of ultrathin sections of the grain interiors by transmission electron microscopy. As a result, the following procedure for the formation of the interstellar graphite spherule bearing TiC crystals is inferred: (1) high-temperature nucleation and rapid growth of the graphitic carbon spherule in the atmosphere of a carbon-rich star, (2) nucleation and growth of TiC crystals during continued growth of the graphitic spherule and the accretion of TiC onto the spherule, (3) quenching of the graphite growth process by depletion of C or by isolation of the spherule before other grain types could condense. Publication: The Astrophysical Journal Pub Date: June 1991 DOI: 10.1086/186054 Bibcode: 1991ApJ...373L..73B Keywords: Carbon Isotopes; Carbonaceous Meteorites; Graphite; Interstellar Matter; Spherules; Abundance; Cosmic Dust; Electron Microscopy; Stellar Atmospheres; Titanium Carbides; Astrophysics; ABUNDANCES; INTERSTELLAR: MATTER; METEORS AND METEORITES; NUCLEOSYNTHESIS full text sources ADS |
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