SIMBAD references

The dwarf nova GW Librae is the first cataclysmic variable discovered to have a primary in the white dwarf instability strip, making it the only non-radially pulsating star known to be accreting. The primaries of CVs are notoriously difficult to study because they are embedded in hot, bright accretion discs. Applying the techniques of asteroseismology to GW Librae could give us an unprecedented look at a white dwarf that has undergone ∼10⁹ years of accretion. However, an accreting white dwarf could have a non-spherical internal structure, rendering the standard (spherically symmetric) solution to white dwarf pulsations invalid for its study. This paper presents amplitude spectra from four observing campaigns conducted on GW Librae during 1997 and 1998. The star's pulsation spectrum is highly unstable on timescales of months and exhibits clusters of signals very closely spaced in frequency, with separations on the order of 1 µHz.