6 papers
The effect of turbulent pressure on the p-mode frequencies in stellar models
P. Demarque, L. H. Li, F. J. Robinson +4
We have constructed models for the sun at three stages of its evolution: a zero-age main sequence model, the present sun, and a subgiant model. For each model, the turbulent pressu…
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.…
The theoretical calculation of the Rossby number and the `non-local' convective overturn time for pre-main sequence and early post-main sequence stars
Yong -Cheol Kim, Pierre Demarque
This paper provides estimates of convective turnover time scales for Sun-like stars in the pre-main sequence and early post-main sequence phases of evolution, based on up-to-date p…
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…
Modelling of Shallow and Inefficient Convection in the Outer Layers of the Sun Using Realistic Physics
Yong -Cheol Kim, Peter A. Fox, Sabatino Sofia +1
In an attempt to understand the properties of convective energy transport in the solar convection zone, a numerical model has been constructed for turbulent flows in a compressible…