Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.288..189s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 1, pp. 189-199.
Astronomy and Astrophysics
Astronomy
17
Binaries: General, Stars: Individual: Wz Sge, Novae, Cataclysmic Variables, Stars: Oscillations
Scientific paper
We present an analysis of high-speed multicolour photometry of the dwarf nova WZSagittae (WZSge). We have updated the orbital ephemeris and found that /P lies within the limits -4.53x10^-13 s s^-1 and 1.53x10^-13 s s^-1 (3sigma limits). We have detected rapid coherent oscillations at three different epochs with periods of 28.95, 29.33 and 28.13s, respectively. The detection of the oscillation with period 29.33s is marginal. The amplitude and phase of the oscillations have been found to vary over time-scales of a few tens of minutes. The colours of the oscillations can be represented by a power-law spectrum (f_nu~nu^alpha) with alpha~=1.8, a blackbody spectrum of temperature T~=120000K or a hydrogen white dwarf spectrum with log g=8 and T~=100000K. The colours of the oscillation amplitudes are not consistent with those expected from a ZZCeti type white dwarf (with a temperature of 15000K). We conclude that the oscillations in WZSge do not arise from direct viewing of the surface of a pulsating white dwarf.
Skidmore Warren
Stiening Rae F.
Welsh William F.
Wood Janet H.
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