AAS 207th Meeting, 8-12 January 2006
Session 128 (Extra) Galactic Globular Clusters
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[128.16] Deep CCD DDO Photometry of M15 and M71 Globular Clusters

C. T. Rodgers, R. Canterna, D. Alllen, M. J. Pierce (University of Wyoming)

We present new DDO photometry of M15 and M71 globular clusters. We present these data through color magnitude diagrams (CMDs) using the DDO 38, 41, 42, and 51 filters in combination with UBVRCIC colors. Our CMDs reach \approx 2 magnitudes below each cluster's main sequence turnoff. We will compare the red giant branch (RGB), the subgiant branch (SGB), and the main sequence turnoff parameters for each cluster's CMD. The effects of any CN anamolies in the RGB and SGB will be highlighted, and the influence of surface gravity via the DDO 51 band will be discussed. This data will give preliminary results for new globular cluster isochrone-age and metallicity templates in the UBVRCIC and DDO systems.

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