- I present a variation on Osaki's tidal-thermal-instability model for SU UMa behaviour. I suggest that in systems with the lowest mass ratios, the angular-momentum dissipation in an eccentric disc is unable to sustain the disc on the hot side of the thermal instability. This decoupling of the tidal and thermal instabilities in low-q systems allows a better explanation of the 'echo' outbursts of WZ Sge systems and the short supercycles of ER UMa stars. The idea might also apply to the soft X-ray transients.
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On echo outbursts and ER UMa supercycles in SUUMa-type cataclysmic variables
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