Discovery of ancient silicate stardust in a meteorite

被引：198

作者：

Nguyen, AN ^{[1
]}

Zinner, E

机构：

[1] Washington Univ, Space Sci Lab, St Louis, MO 63130 USA

[2] Washington Univ, Dept Phys, St Louis, MO 63130 USA

来源：

SCIENCE | 2004年 / 303卷 / 5663期

关键词：

D O I：

10.1126/science.1094389

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 Mg-26, which is attributed to the radioactive decay of Al-26 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.

引用

页码：1496 / 1499

页数：4

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