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AGB subpopulations in the nearby globular cluster NGC 6397
B. T. MacLean, S. W. Campbell, G. M. De Silva +5
It has been well established that Galactic Globular clusters (GCs) harbour more than one stellar population, distinguishable by the anti-correlations of light element abundances (C…
Discovery of a Metal-poor, Luminous Post-AGB Star that Failed the Third Dredge-up
D. Kamath, H. Van Winckel, P. R. Wood +4
Post-asymptotic giant branch (post-AGB) stars are known to be chemically diverse. In this paper we present the first observational evidence of a star that has failed the third dred…
The treatment of mixing in core helium burning models -- III. Suppressing core breathing pulses with a new constraint on overshoot
Thomas Constantino, Simon W. Campbell, John C. Lattanzio
Theoretical predictions for the core helium burning phase of stellar evolution are highly sensitive to the uncertain treatment of mixing at convective boundaries. In the last few y…
NGC 6752 AGB Stars Revisited: I. Improved AGB temperatures remove apparent overionisation of Fe I
S. W. Campbell, B. T. MacLean, V. D'Orazi +5
A recent study reported a strong apparent depression of Fe I, relative to Fe II, in the AGB stars of NGC 6752. This depression is much greater than that expected from the neglect o…
Overshoot Inwards from the Bottom of the Intershell Convective Zone in (S)AGB stars
J. C. Lattanzio, C. A. Tout, E. V. Neumerzhitckii +2
We estimate the extent of overshooting inwards from the bottom of the intershell convective zone in thermal pulses in (S)AGB stars. We find that the buoyancy is so strong that any…
Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements
J. F. Buntain, C. L. Doherty, M. Lugaro +3
The production of the elements heavier than iron via slow neutron captures (the s process) is a main feature of the contribution of asymptotic giant branch (AGB) stars of low mass…