Evolution of low mass zero metal giants up to the helium flash

Details Evolution of low mass zero metal giants up to the helium flash Evolution of low mass zero metal giants up to the helium flash

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115l...1d&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. L1-L3.

Astronomy and Astrophysics

Astrophysics

22

Metallic Stars, Red Giant Stars, Stellar Envelopes, Stellar Evolution, Abundance, Helium, Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Temperature

Scientific paper

If low mass stars having no metals were formed in the first stellar generation, their giant branch evolution is very different from the evolution of pop. II stars. As a consequence of the lack of CNO nuclei, the hydrogen shell burning is sustained by the proton-proton chain up to the helium flash, which occurs at luminosities about a factor 10 lower than in pop. II. However this behavior should not produce important consequences for what concerns the observability of zero metal giants, as the reduction of the space volume in which these stars should be observable in a statistical survey is compensated by the fact that the evolutionary lifetime of the entire hydrogen shell burning phase is much longer.

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