Whole earth telescope observations of the helium interacting binary PG 1346+082 (CR Bootis)

J. L. Provencal*, D. E. Winget, R. E. Nather, E. L. Robinson, J. C. Clemens, P. A. Bradley, C. F. Claver, S. J. Kleinman, A. D. Grauer, B. P. Hine, L. Ferrario, D. O'Donoghue, B. Warner, G. Vauclair, M. Chevreton, S. O. Kepler, M. A. Wood, G. W. Henry

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We present our analysis of 240 hr of white-light, high-speed photometry of the dwarf nova-like helium variable PG 1346+082 (CR Boo). We identify two frequencies in the low-state power spectrum, at 679.670 ± 0.004 μHz and 669.887 ± 0.008 μHz. The 679.670 μHz 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 interacting 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 model, particularly the implications of the high-order harmonics on future studies of disk structure, mass transfer, and disk viscosity.

Original languageEnglish
Pages (from-to)383-394
Number of pages12
JournalAstrophysical Journal
Issue number1 PART I
Publication statusPublished - 1997


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