Toward complete isotopic analysis of individual presolar silicon carbide grains: C, N, Si, Sr, Zr, Mo, and Ba in single grains of type X.

[摘要] Presolar silicon carbide grains form in a variety of types of stars, including asymptotic giant branch red giant stars and supernovae. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively (1). We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo (2-4) and initial results for X-type SiC grains showing enrichments in the r-process isotopes of Mo(5). We report here the first measurements of Zr, Sr, and Ba isotopes along with expanded studies of Mo in individual X-type SiC grains, which have previously been identified as having formed from supernova ejects.

[发布机构] Technical Information Center Oak Ridge Tennessee

[学科分类] 工程和技术（综合）

[关键词] Silicon carbides;Supernovae;Nucleosynthesis;R process;Red giant stars