Double shell burning phase of intermediate mass population III stars

Astronomy and Astrophysics – Astrophysics

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Stellar Composition, Stellar Envelopes, Stellar Mass, Galactic Evolution, Interstellar Matter, Stellar Evolution

Scientific paper

The evolution of population III intermediate mass stars of 5, 7, and 9 solar masses has been studied after the core He-exhaustion phase. There are two energy producing regions within the stars; one is the H-burning shell and the other is the He-burning shell. During the double shell burning phase, the evolution does not proceed on the asymptotic giant branch and the second dredge-up does not appear; hence, there is no change in the surface composition of the stars. The final state of these stars is important in modeling galactic evolution.

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