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Title:
Discovery of Ancient Silicate Stardust in a Meteorite
Authors:
Nguyen, Ann N.; Zinner, Ernst
Affiliation:
AA(Laboratory for Space Sciences and the Physics Department, Washington University, St. Louis, MO 63130, USA.), AB(Laboratory for Space Sciences and the Physics Department, Washington University, St. Louis, MO 63130, USA.)
Publication:
Science, Volume 303, Issue 5663, pp. 1496-1499 (2004).
Publication Date:
03/2004
Category:
PLANETARY SCIENCE
Origin:
SCIENCE
DOI:
10.1126/science.1094389
Bibliographic Code:
2004Sci...303.1496N

Abstract

We have discovered nine presolar silicate grains from the carbonaceous chondrite Acfer 094. Their anomalous oxygen isotopic compositions indicate formation in the atmospheres of evolved stars. Two grains are identified as pyroxene, two as olivine, one as a glass with embedded metal and sulfides (GEMS), and one as an Al-rich silicate. One grain is enriched in 26Mg, which is attributed to the radioactive decay of 26Al and provides information about mixing processes in the parent star. This discovery opens new means for studying stellar processes and conditions in various solar system environments.
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Database: Astronomy
Physics
arXiv e-prints