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A Supergiant Supernova-Blown Bubble in the Spiral Galaxy NGC 1620
J. Patricia Vader, Brian Chaboyer
We present UBR and H imaging of NGC 1620, a highly inclined spiral galaxy that contains a large scale, arc-like feature of radius 3 kpc in its outer disk at a distance of …
Absolute Ages of Globular Clusters and the Age of the Universe
Brian Chaboyer
The main sequence turnoff luminosity is the best stellar `clock' which can be used to determine the absolute ages of globular clusters. This is due to the fact that it is generally…
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…
Stellar Models with Microscopic Diffusion and Rotational Mixing II: Application to Open Clusters
Brian Chaboyer, P. Demarque, M. H. Pinsonneault
Stellar models with masses ranging from 0.5 to were constructed in order to compare to young cluster observations of Li and of rotation velocities. The amount of Li d…
Stellar Models with Microscopic Diffusion and Rotational Mixing I: Application to the Sun
Brian Chaboyer, P. Demarque, M. H. Pinsonneault
The Yale stellar evolution code has been modified to include the combined effects of diffusion and rotational mixing on H, He and the trace elements He, Li, Li,…
The Primordial Abundance of Li and be
Brian Chaboyer
Light element (Li, Li and Be) depletion isochrones for halo stars have been calculated with standard stellar evolution models. These models include the latest available…