Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...480..383p&link_type=abstract
Astrophysical Journal v.480, p.383
Astronomy and Astrophysics
Astronomy
26
Stars: Individual Alphanumeric: Pg 1346+082, Stars: Oscillations, Stars: White Dwarfs
Scientific paper
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 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 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.
Bradley Paul Andrew
Chevreton M.
Claver Charles Frederick
Clemens James Christopher
Edward Nather R.
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