Presolar Grains – Isotope Compositions скачать в хорошем качестве

Presolar Grains – Isotope Compositions

Presolar grains are characterised by their largely different isotope compositions. While solar system materials typically have isotope variations in the maximum permil range of the delta-notation, presolar grains have up to orders of magnitude variations of individual isotope ratios. Typical and large isotope variations are found in e.g., O, C, N, Si, Cr, Ti. The grains are classified according to their isotope composition in various groups that can then be assigned to their origin and formation in e.g., red giants, AGB stars, supernovae, etc. Presolar grains can be isolated after acid dissolution or found using in-situ techniques.