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Presolar corundum and spinel in ordinary chondrites: origins from AGB stars and a supernova
B G Choi1, G R Huss, G J Wasserburg
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. bchoi@gps.caltech.edu
Abstract:
On the basis of anomalous isotopic compositions of oxygen and magnesium, 14 oxide grains from two primitive meteorites (Bishunpur and Semarkona) have been identified as circumstellar condensates. One corundum grain has a high 18O/16O ratio and isotopic compositions of magnesium, calcium, and titanium that are compatible with a formation in ejecta of a type II supernova that was about 15 times the mass of the sun. The other grains have oxygen, magnesium, and titanium compositions that are consistent with a formation around asymptotic giant branch (AGB) stars with a range of mass and initial composition. The large range of aluminum/magnesium in circumstellar corundum and spinel is considered to reflect various stages of back-reaction between condensed corundum and gaseous magnesium in cooling stellar ejecta.
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