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2000MNRAS.319..510R - Mon. Not. R. Astron. Soc., 319, 510-516 (2000/December-1)
Thermal stability and nova cycles in permanent superhump systems.
RETTER A. and NAYLOR T.
Abstract (from CDS):
We suggest applying the nova cycle scenarios offered for systems above the period gap to the short orbital period CVs. Permanent superhumps have been observed in the two non-magnetic ex-novae with binary periods below the gap. Their post-nova magnitudes are brighter than their pre-outburst values. In one case (V1974 Cyg) it has been demonstrated that the pre-nova should have been a regular SU UMa system. Thus, it is the first nova whose accretion disc was observed to change its thermal stability. If the superhumps in this system indicate persistent high mass-transfer rates rather than a temporary change induced by irradiation from the hot post-nova white dwarf, it is the first direct evidence for mass-transfer cycles in CVs. The proposed cycles are driven by the nova eruption.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): accretion, accretion discs - stars: evolution - stars: individual: V1974 Cyg - stars: individual: CP Pup - novae, cataclysmic variables
Simbad objects: 15
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