The astrophysical interpretation of isotope anomalies in graphite and SiC grains of chondrites

Astronomy and Astrophysics – Astrophysics

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Carbonaceous Chondrites, Cosmic Dust, Interstellar Matter, Isotopic Labeling, Massive Stars, Meteoritic Composition, Nuclear Fusion, Silicon Carbides, Stellar Winds, Astrophysics, Carbon Isotopes, Graphite, Magnesium Isotopes, Nitrogen Isotopes

Scientific paper

The C, N, and Mg isotopic compositions in graphite and SiC grains of carbonaceous chondrites can be explained by nuclear processes in massive O,B stars of second generation passed a stage of WR star with intensive stellar wind, where grain condensation had taken place. The interstellar graphite and SiC grains with anomalous isotopic compositions of C, N, Ne, and Si and other elements of nucleosynthetic origin, found in non-equilibrated chondrites, are most suitable for determination of astro-physical objects, where nucleosynthesis had taken place. Two objects were examined: (1) massive O,B stars of second generation passed a stage of WR star with intensive stellar wind (O,B-WR model) and (2) low-mass stars (1 less than or equal to M/solar mass less than or equal to 3) during thermally pulsing asymptotic giant branch phase (TP-AGB model).

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