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| Paper: |
On deriving globular-cluster luminosity functions from CCD observations, with a particular application to the main-sequence turnoff/subgiant branch in metal-poor clusters |
| Volume: |
13, The Formation and Evolution of Star Clusters |
| Page: |
88 |
| Authors: |
Stetson, Peter B. |
| Abstract: |
Some techniques involved in deriving and interpreting observational stellar luminosity functions from CCD observations are reviewed. Then the combined luminosity function for the three metal-poor globular clusters M68 (= NGC 4590), NGC 6397, and M92 (= NGC 6341) is examined. This data set contains enough stars to permit interesting tests of stellar evolutionary models. In particular, if WIMPs exist in quantities large enough to close the universe, their effects on stellar evolution may be visible in the main-sequence turnoff/subgiant-branch part of the luminosity function. |
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