On Echo Outbursts and ER UMa Supercycles in SU UMa–Type Cataclysmic Variables | Zendy

C. Hellier | Zendy

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On Echo Outbursts and ER UMa Supercycles in SU UMa–Type Cataclysmic Variables

Author(s) -

C. Hellier

Publication year - 2001

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/319540

Subject(s) - physics , angular momentum , astrophysics , decoupling (probability) , instability , thermal , dissipation , mechanics , classical mechanics , thermodynamics , control engineering , engineering

I present a variation on Osaki's tidal-thermal-instability model for SU UMabehavior. I suggest that in systems with the lowest mass ratios, theangular-momentum dissipation in an eccentric disk is unable to sustain the diskon the hot side of the thermal instability. This decoupling of the tidal andthermal instabilities in systems with q < 0.07 allows a better explanation ofthe `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.Comment: To appear in PASP, April 2001 (6 pages, 4 figs

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