Flash of helium
The flash of helium is a short and sudden racing of the reaction of fusion of the Hélium in the heart of the star S of mass solar at the end of the principal Séquence. It is about a prediction of the models of stellar structure which is not directly observed, because this flash does not result in an increase in the Luminosité of star: the produced radiation is completely absorbed by the envelope.
This racing of the Réaction triples alpha intervenes because of the degeneration of the heart, i.e. when the thermal energy is lower than the energy of Fermi. In this case, the increase in Température resulting from fusion is not compensated by an increase in Pression and the racing occurs; a power equivalent to several galaxies then is briefly produced. The flash ceases when the temperature becomes sufficiently high to raise the degeneration. The heart can then dilate and fusion reaches a stable mode.
See too
Related articles
- stellar Évolution
- Réaction triples alpha
- Énergie of Fermi
| Random links: | Zone (Dubé) | Mona Simpson (author) | Tarjei Vesaas | Pollination of the apple trees | Championship of the world of hockey 2007 | Allen_Steele |