6 papers · 1 filter
Horizontal-Branch Morphology as an Age Indicator
Young-Wook Lee, Suk-Jin Yoon, Soo-Chang Rey +1
We present our recent revision of model constructions for the horizontal-branch (HB) morphology of globular clusters, which suggests the HB morphology is more sensitive to age comp…
Internal Rotation, Mixing and Lithium Abundances
Brian Chaboyer
Lithium is an excellent tracer of mixing in stars as it is destroyed (by nuclear reactions) at a temperature around K. The lithium destruction zone is typical…
The Evolution of Procyon A
Brian Chaboyer, P. Demarque, D. B. Guenther
A grid of stellar evolution models for Procyon A has been calculated. These models include the best physics available to us (including the latest opacities and equation of state) a…
A Precision Age Determination Technique for Globular Clusters
Brian Chaboyer, Pierre Demarque, Peter Kernan +2
Globular cluster age estimates based on the absolute magnitude of the main sequence turn-off (\mvto) are generally considered to be the most reliable from a theoretical viewpoint.…
Halo Star Evolution
Brian Chaboyer
In this review, I will discuss a few problems which point to the need for improved stellar evolution models of halo stars. Current stellar evolution models do not match the observe…
Ages of Galactic Globular Clusters from the New Yale Isochrones
Brian Chaboyer, P. Demarque, D. B. Guenther +2
A new grid of theoretical isochrones based on the Yale stellar evolution code using the OPAL and Kurucz opacities has been constructed. The grid of isochrones spans a wide range of…