Presolar Graphite: Noble Gases and their Origins

Publications of the Astronomical Society of Australia

Sachiko Amari¹ 

关键词: meteorites;    presolar grains;    Ne-E(L);    isotopic anomalies;    nucleosynthesis;   

DOI  :  10.1071/AS03044

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

Presolar graphite contains a 22Ne-rich component called Ne-E(L). Noble gas studies on graphite aggregates and single grains have shown that although a dominant source of the 22Ne is 22Na, 22Ne in the He-shell of asymptotic giant branch stars have also contributed to the Ne-E(L). In addition to novae that have been considered to be a possible source of 22Na, supernovae are a likely source as well. Krypton isotopic ratios of the separates indicate that part of graphite formed in low-mass (≤3 M⊙) asymptotic giant branch stars of low metallicity (Z ≤ 0.006).

【 授权许可】

Unknown