![]() ![]() Warner, Cataclysmic Variable Stars, 1995, 2003, Cambridge University Press There is a solid observational evidence for accretion discs in CVsīased on very accurate photometry and spectroscopy. The geometry of accretion is very different in magnetic CVs, whereĪccretion discs are either truncated or absent and accretion occurs along the Is due to a specific accretion disc limit-cycle instability, tidal torques,Īnd fluctuations in the mass-transfer rate from the secondary. In the visible light of U Gem increases 100-fold every 120 days or so,Īnd returns to the original level after a week or two. Show outbursts lasting for about a week and separated by weeks to months Is only weakly magnetised, the matter forms an accretion disc around Lobe", the companion loses matter through the first Lagrangian point When the outer layers of the companion overflow the "Roche Sizes comparable to the Earth-Moon system, and orbital periods ofĪ few hours.
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