AAS 207th Meeting, 8-12 January 2006
Session 122 Variable Stars
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[122.07] Light Curves for Type II Cepheids in M3 and M5

K. Rabidoux, H.A. Smith, K. Wells, J. Randall, D. Hartley, A. LaCluyze, N. De Lee, M. Ingber, M. Ireland, K. KInemuchi, E. Pellegrini, L.E. Purdum (Michigan State University), B.J. Pritzl, R. Lustig (Macalester College), W. Osborn, J. Lacy, M. Curtis, J. Smolinski (Central Michigan University)

Many of the longer period Cepheids within globular clusters do not have modern light curves in the standard B, V, and Cousins-I photometric bandpasses. As part of a larger program to secure B, V, and I band photometry for these type II Cepheids, we have obtained CCD images of the globular clusters M3 and M5. Data were obtained with the 60-cm telescope at Michigan State University and the 40-cm telescopes at Macalester College and Central Michigan University. Light curves are presented for several Cepheids in these clusters. V84 in M5 shows evidence of alternating high and low maxima, indicative of RV Tauri behavior, and may mark the dividing line between pulsations of the type II Cepheid and RV Tauri variety. Observations have also been obtained for type II Cepheids in the globular clusters M2, M10, M12, and M13. Light curves for these variables will be used to investigate the period-luminosity relation for globular cluster Cepheids and to study their pulsational properties. This work has been supported in part by the National Science Foundation.

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