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.
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.