AH Cam

A low-resolution spectrum of AH Cam indicates that it is relatively metal rich, with {DELTA}S<=2. Its high metallicity and short modulation period may provide a critical test of at least one theory for the Blazhko effect. Moskalik's internal resonance model makes specific predictions of the growth rate of the fundamental mode vs fundamental period.

AH Cam falls outside the regime of other known Blazhko variables and resonance model predictions, but these are appropriate for metal-poor RR Lyrae stars. If the theory matches the behavior of AH Cam for a metal-rich stellar model, this would bolster the resonance hypothesis. Addresses: Smith H.A. smith@msupa.pa.msu.edu Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824 Matthews J.M. matthews@astro.ubc.ca Department of Geophysics & Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada and Departement de physique et Observatoire du Mont Megantic, Universite de Montreal, Montreal, Quebec H3C 3J7, Canada Lee K.M., Williams J., and Silbermann N.A. silbermann@msupa.pa.msu.edu Department of Physics & Astronomy, Michigan State University, East Lansing Michigan 48824 Bolte M. bolte@lick.ucsc.edu Hubble Fellow, NASA/ST ScI, UCO/Lick Observatory, University of California, Santa Cruz, California 95064