The delayed detonation

The experiments of terrestrial combustion showed that a transition from a turbulent deflagration towards a detonation is possible. Models were thus proposed in which the initial deflagration is transformed into detonation in the final phase of the explosion. This transition appears when the density goes down below $10^7 \rm \, g\, cm^{-3}$. This type of model is an elegant manner to solve the problems encountered by the two preceding models: the generated power is amply sufficient to completely disperse star and the initial period makes it possible to produce abundances of the intermediate elements of masses observed in the spectra. Lastly, as in the case of the models of deflagration, the variety could be explained by multiple lightings. The principal problem of this model is that it introduces new parameters (like the density of transition between the two modes) in a a little artificial way and seems more than ever to be defined in an ad hoc way .