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Tungsten isotopic compositions in stardust SiC grains from the Murchison meteorite: Constraints on the s-process in the Hf-Ta-W-Re-Os region

Avila, Janaina; Lugaro, Maria; Ireland, Trevor; Gyngard, Frank; Zinner, Ernst; Cristallo, Sergio; Holden, Peter; Buntain, Joelene; Amari, Sachiko; Karakas, Amanda

Description

We report the first tungsten isotopic measurements in stardust silicon carbide (SiC) grains recovered from the Murchison carbonaceous chondrite. The isotopes182,183,184,186W and179,180Hf were measured on both an aggregate (KJB fraction) and single stardust SiC grains (LS+LU fraction) believed to have condensed in the outflows of low-mass carbon-rich asymptotic giant branch (AGB) stars with close-to-solar metallicity. The SiC aggregate shows small deviations from terrestrial (= solar)...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
URI: http://hdl.handle.net/1885/66090
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/744/1/49

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