EXTREME MG-26 AND O-17 ENRICHMENTS IN AN ORGUEIL CORUNDUM - IDENTIFICATION OF A PRESOLAR OXIDE GRAIN

被引:118
作者
HUTCHEON, ID [1 ]
HUSS, GR [1 ]
FAHEY, AJ [1 ]
WASSERBURG, GJ [1 ]
机构
[1] CALTECH,DIV GEOL & PLANETARY SCI,CHARLES ARMS LAB,LUNAT ASYLUM,PASADENA,CA 91125
关键词
CIRCUMSTELLAR MATTER; DUST; EXTINCTION; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; ABUNDANCES; STARS; AGB AND POST-AGB; SOLAR SYSTEM; FORMATION;
D O I
10.1086/187319
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A corundum (Al2O3) grain from the Orgueil meteorite is greatly enriched in O-17 and Mg-26*. Th, measured O-16/O-17 is 1028 +/- 11 compared to (O-16/O-17). = 2610. This is the largest O-17 excess SO far observed in any meteoritic material. The (26)Ma excess (Mg-26*) is most plausibly due to in situ decay of Al-26. The inferred (Al-26/Al-27)(0) ratio of 8.9 x 10(-4) is similar to 18 times larger than the 5 x 10(-5) value commonly observed in refractory inclusions formed in the solar system. The large O-17 excess and high Mg-26*/Al-27 ratio unambiguously identify this corundum as a presolar oxide grain. Enrichments in O-17 and Al-26 are characteristic of H-burning and point to red giant or AGB stars as likely sources.
引用
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页码:L97 / L100
页数:4
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