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