Some Key Issues in Isotopic Anomalies: Astrophysical History and Aggregation

摘要: Astrophysical history, particularly that period extending from stellar nucleosynthesis events to the formation of meteorites, is discussed as key element for understanding isotopic anomalies in meteorites. The bulk homogeneity interstellar medium considered, and it argued that, despite presence spatial inhomogeneities due different rates parts galaxy supernova ejecta, a cosmic chemical memory patterns, rather than an inhomogeneous injection, source anomalies. According this view, volatility patterns some are mapped onto grain-size spectrum, FUN systematics may be explained by sputtering. Furthermore, meteoritic He Ne abundances inferred presolar, ubiquitous titanium processes fixation condensation varying environments.