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| Paper: |
Globular clusters as tests of stellar evolution |
| Volume: |
20, Frontiers of Stellar Evolution: Celebrating the 50th Anniversary of McDonald Observatory (1939-1989) |
| Page: |
185 |
| Authors: |
Hesser, James E. |
| Abstract: |
An evaluation is conducted of recent spectroscopic tests of mixing within globular cluster stars, as well as current and future uses of color-magnitude diagrams to test evolutionary models, and the conflicting evidence for mixing within stars of globular clusters in two metallicity groups is examined, emphasizing the CNO group of elements and the lack of suitable O/Fe abundance data. Attention is also given to color-magnitude diagram morphology, binaries in clusters, luminosity functions, and age-derivation comparisons between stellar models and observations; with respect to this last, it should be possible to measure much more reliable relative ages throughout the Galactic halo. |
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