Type II supernova matter in a silicon carbide grain from the Murchison meteorite

被引：76

作者：

Hoppe, P ^{[1
]}

Strebel, R ^{[1
]}

Eberhardt, P ^{[1
]}

Amari, S ^{[1
]}

Lewis, RS ^{[1
]}

机构：

[1] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637

来源：

SCIENCE | 1996年 / 272卷 / 5266期

关键词：

D O I：

10.1126/science.272.5266.1314

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：

The circumstellar silicon carbide (SiC) grain X57 from the Murchison meteorite contains large amounts of radiogenic calcium-44 (20 times its solar system abundance) and has an anomalous silicon isotopic composition, different from other circumstellar SiC grains. Its inferred initial Ti-44/Si and Ti-44/Ti-48 ratios are 1.6 x 10(-4) and 0.37. In addition, it contains radiogenic magnesium-26; the inferred initial Al-26/Al-27 ratio is 0.11. The isotopic and elemental data of X57 can be explained by selective mixing of matter from different zones of a typical type II supernova of 25 solar masses during its explosion. The high Ti-44/Si ratio requires contributions from the innermost nickel zone of the supernova to the SiC condensation site, as similarly suggested by astronomical observations.

引用

页码：1314 / 1316

页数：3

共 24 条

[1] INTERSTELLAR SIC WITH UNUSUAL ISOTOPIC COMPOSITIONS - GRAINS FROM A SUPERNOVA [J].