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Population III stars are a hypothetical population and thus far unobserved of extremely massive stars that were believed to be formed in the early universe. They have not been observed directly, but are believed to be components of faint blue galaxies . Their existence is necessary to account for the fact that heavy elements, which could not have been created in the big bang are observed in quasar spectra as well as the existence of faint blue galaxies. It is believed that these stars triggered a period of reionization.

The current model, which seems to be borne out by computer models of stellar evolution is that with no heavy elements from the big bang, it was easy to form stars much more massive than the ones visible today. Typical masses for population III stars are believed to be about several hundred solar masses, which is much larger than current stars. This also conveniently explains why there have been no low-mass stars with zero metalicity observed.

see population I star , population II star

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Topics: Population III Stars, Population Inversion, Population Transfer...

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