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Session 80 - Star Clusters in the Milky Way.
Display session, Friday, January 09
Exhibit Hall,

[80.13] The WIYN Open Cluster Study: Photometry of NGC 188

T. von Hippel (University of Wisconsin), A. Sarajedini (San Fransisco State University)

We report our results on the old (\sim6 Gyrs) open cluster NGC 188, obtained as part of the WIYN Open Cluster Study. We have obtained wide field photometry at the KPNO 0.9m telescope and deep photometry, to V \geq 24, at the WIYN telescope. We present color magnitude diagrams spanning \sim13 magnitudes in V, vastly improving upon previous, mostly photographic, work. We compare the observed kinks in the main sequence V versus V - I color magnitude diagram to globular clusters observations obtained with the Hubble Space Telescope. We also compare the luminosity function of NGC 188 to these same globular clusters. We use these comparisons to study the mass - luminosity relation and the initial mass function over 2 dex in metal abundance.

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