skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Astrophysical Journal
; ;  [1]; ;  [2]
  1. Department of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637 (United States)
  2. Dipartimento di Fisica, Università di Torino, Torino I-10125 (Italy)
+ Show Author Affiliations

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, Vol. 788, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
Country of Publication:
United States
Language:
English

Cited By (13)

H ingestion into He-burning convection zones in super-AGB stellar models as a potential site for intermediate neutron-density nucleosynthesis journal December 2015
Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements journal June 2017
NuGrid stellar data set – III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z= 0.01, Z = 0.02, and Z = 0.03 journal August 2019
s -PROCESSING IN AGB STARS REVISITED. II. ENHANCED 13 C PRODUCTION THROUGH MHD-INDUCED MIXING journal February 2016
Application of a Theory and Simulation-Based Convective Boundary Mixing Model for agb star Evolution and Nucleosynthesis journal August 2016
NUGRID STELLAR DATA SET. I. STELLAR YIELDS FROM H TO BI FOR STARS WITH METALLICITIES Z = 0.02 and Z = 0.01 journal August 2016
The Importance of the 13 C( α ,n) 16 O Reaction in Asymptotic Giant Branch Stars journal May 2018
New Constraints on the Major Neutron Source in Low-mass AGB Stars journal September 2018
Molybdenum Isotopes in Presolar Silicon Carbide Grains: Details of s -process Nucleosynthesis in Parent Stars and Implications for r - and p -processes journal May 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins journal August 2019
Application of a Theory and Simulation-based Convective Boundary Mixing Model for AGB Star Evolution and Nucleosynthesis text January 2016
NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03 text January 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins text January 2019

Similar Records

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
ASYMPTOTIC SOLUTIONS
CARBON 13
COMPUTERIZED SIMULATION
ELEMENT ABUNDANCE
GIANT STARS
METEORITES
METEOROIDS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
SILICON CARBIDES
STARS
ZIRCONIUM 92
ZIRCONIUM 94