Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..561h&link_type=abstract
Lunar and Planetary Science, volume 27, page 561
Physics
8
Grains: Interstellar, Isotope Anomalies, Meteorites, Nucleosynthesis, Silicon Carbide
Scientific paper
In a search for the rare SiC grains of types A and B (12C/13C <= 10 we have screened approximately 2000 SiC grains from Murchison separate KJE (average size 1.14 micrometers by ion imaging and subsequently analyzed candidate grains together with approximately 200 SiC grains from Murchison separate KJC (average size 0.67 micrometers) by conventional analysis technique with the University of Bern ion microprobe. Together with our data previously obtained for separate KJE we now have C-, N-, MgAl-, and Si-isotopic data of 73 A and B grains (not all elements on all grains. The C- and N-isotopic data can be reproduced remarkably well by a simple model mixing CNO- and He-burning products. The previously postulated origin of the A and B grains in J-type carbon stars and CH stars is supported by our new data. For one grain with 14N/15N = 7, however, a nova origin is a realistic possibility.
Amari Sachiko
Eberhardt Peter
Hoppe Peter
Kocher T. A.
Lewis Reed S.
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