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3D Numerical Experimentation on the Core Helium Flash of low-mass Red Giants
David S. P. Dearborn, John C. Lattanzio, Peter P. Eggleton
We model the core helium flash in a low-mass red giant using Djehuty, a fully three-dimensional (3D) code. The 3D structures were generated from converged models obtained during th…
Nuclear Reaction Rate Uncertainties and Astrophysical Modeling. II. Carbon Yields from Low-mass Giants
F. Herwig, Sam M. Austin, John C. Lattanzio
Calculations that demonstrate the influence of three key nuclear reaction rates on the evolution of Asymptotic Giant Branch stars have been carried out. We study the case of a star…
Fluorine Abundance Variations in Red Giants of the Globular Cluster M4 and Early-Cluster Chemical Pollution
V. V. Smith, K. Cunha, I. I. Ivans +2
We present fluorine abundances in seven red-giant members of the globular cluster M4 (NGC 6121). These abundances were derived from the HF (1--0) R9 line at 2.3357 microns in high-…
What we do and do not know about the s-process
J. C. Lattanzio, M. A. Lugaro
AGB stars are the source for the main component of the -process. Here we discuss both the properties which are reasonably well known and those which still suffer from substantia…
Abundance Anomalies in NGC6752 - Do AGB Stars Have a Role?
S. W. Campbell, Y. Fenner, A. I. Karakas +2
We are in the process of testing a popular theory that the observed abundance anomalies in the Globular Cluster NGC 6752 are due to `internal pollution' from intermediate mass asym…