The {sup 13}C-pocket structure in AGB models: constraints from zirconium isotope abundances in single mainstream SiC grains

Liu, Nan; Davis, Andrew M.; Pellin, Michael J.; Gallino, Roberto; Bisterzo, Sara

doi:10.1088/0004-637X/788/2/163

The {sup 13}C-pocket structure in AGB models: constraints from zirconium isotope abundances in single mainstream SiC grains

Journal Article · Fri Jun 20 00:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/788/2/163· OSTI ID:22356566

Liu, Nan; Davis, Andrew M.; Pellin, Michael J. ^[1]; Gallino, Roberto; Bisterzo, Sara ^[2]

Department of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637 (United States)
Dipartimento di Fisica, Università di Torino, Torino I-10125 (Italy)

We present postprocess asymptotic giant branch (AGB) nucleosynthesis models with different {sup 13}C-pocket internal structures to better explain zirconium isotope measurements in mainstream presolar SiC grains by Nicolussi et al. and Barzyk et al. We show that higher-than-solar {sup 92}Zr/{sup 94}Zr ratios can be predicted by adopting a {sup 13}C-pocket with a flat {sup 13}C profile, instead of the previous decreasing-with-depth {sup 13}C profile. The improved agreement between grain data for zirconium isotopes and AGB models provides additional support for a recent proposal of a flat {sup 13}C profile based on barium isotopes in mainstream SiC grains by Liu et al.

OSTI ID:: 22356566

Journal Information:: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 788; ISSN ASJOAB; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
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