SIMBAD references

2004ApJ...608L.105T - Astrophys. J., 608, L105-L108 (2004/June-3)

Seismology of the accreting white dwarf in GW Librae.

TOWNSLEY D.M., ARRAS P. and BILDSTEN L.

Abstract (from CDS):

We present a first analysis of the g-mode oscillation spectrum for the white dwarf (WD) primary of GW Lib, a faint cataclysmic variable. Stable periodicities have been observed from this WD for a number of years, but their interpretation as stellar pulsations has been hampered by a lack of theoretical models appropriate to an accreting WD. Using the results of Townsley & Bildsten, we construct accreting models for the observed effective temperature and approximate mass of the WD in GW Lib. We compute g-mode frequencies for a range of accreted layer masses, Macc, and long-term accretion rates, <M{dot}>. If we assume that the observed oscillations are from ℓ=1 g-modes, then the observed periods are matched when M~1.02 M☉, Macc~0.31x10–4 M☉, and <M{dot}>~7.3x10–11 M☉/yr. Much more sensitive observations are needed to discover more modes, after which we will be able to more accurately measure these parameters and constrain or measure the WD's rotation rate.

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Journal keyword(s): Stars: Binaries: Close - Stars: Novae, Cataclysmic Variables - Stars: Dwarf Novae - Stars: White Dwarfs

Simbad objects: 1

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