Iron-enriched stardust grains in the meteorites Acfer 094, QUE 99177 and MET 00426.

Bose M., Floss C., and Stadermann F. J. (2008)
Meteorit. Planet. Sci. 43 (7, Suppl.), A27.


ABSTRACT

In this study elemental compositions of the presolar grains identified in Acfer 094 are measured in the Auger Nanoprobe. Classification of the presolar silicates into olivine and pyroxene is done on the basis of the Fe+Mg(+Ca)/Si ratio. Fe-Mg silicates (e.g., olivine and pyroxene) are expected to have Mg-rich compositions under conditions of equilibrium condensation in the winds of evolved stars. We also compare the presolar silicate grain compositions found in Acfer 094 to those in the CR chondrites QUE 99177 and MET 00426.


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