Dwarf Nova Oscillations: New Results

Details Dwarf Nova Oscillations: New Results Dwarf Nova Oscillations: New Results

2001-09-22

arxiv.org/abs/astro-ph/0109397v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, Latex, uses newpasp.sty; to appear in `The Physics of Cataclysmic Variables and Related Objects', ASP Con

Scientific paper

New and archived observations of VW Hyi in outburst show the occasional presence of optical Dwarf Nova Oscillations (DNOs) over the range of 18 - 40 s. There is a rapid increase in period near the end of outburst, at the same time that the EUV falls almost to zero, which we attribute to propellering. The DNOs return to a shorter period after this phase, but are very incoherent. The DNOs show some modulation by the Quasi-Periodic Oscillations (QPOs) that are also occasionally present in the light curve. We interpret the QPOs as a prograde travelling wave in the inner disc, which obscures and/or reprocesses radiation from the central region. The model is applied to observations of OY Car and WZ Sge.

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