Published online by Cambridge University Press: 12 April 2016
The cyclic evolution of classical novae (CN) cannot be observed, as in the case of recurrent or dwarf novae. The duration of a typical cycle may range from a few thousand to a few 105 years. Thus we have to rely on theoretical studies for understanding the periodic outbursts — due to thermonuclear runaways (TNR) — on the surface of accreting white dwarfs (WD). One may distinguish between two kinds of studies: a) detailed investigations of a specific aspect or a particular evolutionary phase; b) studies which emphasize the cyclic behavior of novae and their long-term evolution. The latter, which form the subject of this brief review, may be divided into four groups, each adopting a different approach to the problem:
1. Steady-state (semi-analytic) solutions;
2. One- (or two-) zone models;
3. Quasi-static (and/or steady burning) numerical calculations;
4. Full-scale hydrodynamic evolutionary computations.