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Session 103 - Cool Stars.
Display session, Thursday, January 18
North Banquet Hall, Convention Center

[103.08] Stellar Rotation and the Luminosity Functions of Globular Clusters

A. M. Larson, D. A. VandenBerg, R. DePropris (University of Victoria)

We have constructed stellar models which treat rotation in the simple, spherically-symmetric approximation to determine whether rotation may help to explain some of the anomalous features in the observed luminosity functions of very metal-poor globular clusters. These features include a `bump' on the subgiant branch (near M_V = 3.5) and an excess in the number of red-giants relative to the number of turnoff stars as compared with the predictions of canonical, non-rotating models. Preliminary indications are that rotation can alleviate the second, but not the first, of these difficulties. The consequences of rotation for the tightness of observed color-magnitude diagrams in the vicinity of the turnoff and for age-versus-turnoff luminosity relations are discussed.

Program listing for Thursday