Whole Earth Telescope observations of the helium interacting binary PG 1346+082 (CR bootis)

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 t...

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Bibliographic Details
Main Author: Provencal, Judith L. (author)
Other Authors: Winget, Donald Earl (author), Nather, R. Edward (author), Robinson, E.L. (author), Clemens, J. Christopher (author), Bradley, Paul A. (author), Claver, C.F. (author), Kleinman, Scot James (author), Grauer, Albert D. (author), Hine, B.P. (author), Ferrario, Lilia (author), O'Donoghue, Darragh (author), Warner, B. (author), Vauclair, Gérard (author), Chevreton, Michel (author), Kepler, Souza Oliveira (author), Wood, Matthew A. (author), Henry, G.W. (author)
Format: other article
Language:eng
Published: 2015
Subjects:
Fotometria estelar
Anãs brancas
Estrelas binarias cataclismicas
Stars : individual (PG 1346+082)
Stars : oscillations
White dwarfs
Online Access:http://hdl.handle.net/10183/108834
Country:Brazil
Oai:oai:www.lume.ufrgs.br:10183/108834
Description
Summary: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 powerÏs amplitude and frequency structure on overall system magnitude. We discuss these Ðndings 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.

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