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

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

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Título Whole Earth Telescope observations of the helium interacting binary PG 1346+082 (CR bootis)
Autor Provencal, Judith L.
Winget, Donald Earl
Nather, R. Edward
Robinson, E.L.
Clemens, J. Christopher
Bradley, Paul A.
Claver, C.F.
Kleinman, Scot James
Grauer, Albert D.
Hine, B.P.
Ferrario, Lilia
O'Donoghue, Darragh
Warner, B.
Vauclair, Gérard
Chevreton, Michel
Kepler, Souza Oliveira
Wood, Matthew A.
Henry, G.W.
Abstract 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.
Contido em The astrophysical journal. Chicago. Vol. 480, no. 1, pt. 1 (May 1997), p. 383-394
Assunto Anãs brancas
Estrelas binarias cataclismicas
Fotometria estelar
[en] Stars : individual (PG 1346+082)
[en] Stars : oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108834
Arquivos Descrição Formato
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