WHOLE EARTH TELESCOPE OBSERVATIONS OF THE HELIUM INTERACTING BINARY PG-1346-BOOTIS)(082 (CR)

We present our analysis of 240 hr of white-light, high-speed photometr y of the dwarf nova-like helium variable PG 1346+082 (CR Boo). We iden tify two frequencies in the low-state power spectrum, at 679.670 +/- 0 .004 mu Hz and 669.887 +/- 0.008 mu Hz. The 679.670 mu Hz variation is coherent over at least a 2 week time span, the first demonstration of a phase-coherent photometric variation in any dwarf nova-like interac ting binary white dwarf system. The high-state power spectrum contains a complex fundamental with a frequency similar, but not identical, to the low-state spectrum, and a series of harmonics not detected in low state. We also uncover an unexpected dependence of the high-frequency power's amplitude and frequency structure on overall system magnitude . We discuss these findings' in light of the general AM CVn system mod el, particularly the implications of the high-order harmonics on futur e studies of disk structure, mass transfer, and disk viscosity.