On Echo Outbursts and ER UMa Supercycles in SU UMa-type Cataclysmic Variables

Details On Echo Outbursts and ER UMa Supercycles in SU UMa-type Cataclysmic Variables On Echo Outbursts and ER UMa Supercycles in SU UMa-type Cataclysmic Variables

2001-01-08

arxiv.org/abs/astro-ph/0101102v1

Astronomy and Astrophysics

Astrophysics

To appear in PASP, April 2001 (6 pages, 4 figs)

Scientific paper

10.1086/319540

I present a variation on Osaki's tidal-thermal-instability model for SU UMa behavior. I suggest that in systems with the lowest mass ratios, the angular-momentum dissipation in an eccentric disk is unable to sustain the disk on the hot side of the thermal instability. This decoupling of the tidal and thermal instabilities in systems with q < 0.07 allows a better explanation of the `echo' outbursts of EG Cnc and the short supercycles of RZ LMi and DI UMa. The idea might also apply to the soft X-ray transients.

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