Bursting star formation and the overabundance of Wolf-Rayet stars

Physics

Scientific paper

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Abundance, Galactic Radiation, Gamma Rays, Wolf-Rayet Stars, Cosmic Rays, Flux Density, Interstellar Matter, Stellar Evolution, Stellar Oscillations

Scientific paper

The ratio of the number of WR-stars to their OB progenitors appears to be significantly higher in some extragalactic systems than in our Galaxy. This overabundance of Wolf-Rayet-stars can be explained as a consequence of a recent burst of star formation. It is suggested that this burst is the manifestation of a long period nonlinear oscillation in the star formation process, produced by positive feedback effects between young stars and the interstellar medium. Star burst galaxies with large numbers of WR-stars must generate gamma - fluxes but due to the distance, all of them are beyond the reach of present-day ray detectors, except probably 30 Dor.

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