Noise-induced oscillation and stochastic resonance in an autonomous chemical reaction system

autonomous three-variable chemical reaction model, which has been developed to describe kinetic oscillations in the NO+CO reaction, subjected to exter nal parametric noise, is investigated. Noise-induced coherent oscillations (NICO's) in the absence of deterministic oscillations are observed near sup ercritical Hopf bifurcation points, and the NICO strength goes through a ma ximum with increments of noise intensity, characteristic of the occurrence of stochastic resonance. On the other hand, these phenomena do not appear i f the limit cycle is created by a saddle-loop bifurcation. [S1063-651X(99)0 7511-X].