Main sequence models for massive zero-metal stars

Details Main sequence models for massive zero-metal stars Main sequence models for massive zero-metal stars

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..31....3c&link_type=abstract

Astrophysics and Space Science, vol. 31, Nov. 1974, p. 3-10. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

12

Abundance, Astronomical Models, Main Sequence Stars, Stellar Evolution, Stellar Structure, Big Bang Cosmology, Cyanides, Giant Stars, Helium, Nuclear Fusion, Red Shift, Stellar Mass

Scientific paper

Zero-age main-sequence models for stars of 20, 10, 5, and 2 solar masses with no heavy elements are constructed for three different possible primordial helium abundances: Y=0.00, Y=0.23, and Y=0.30. The latter two values of Y bracket the range of primordial helium abundances cited by Wagoner. With the exceptions of the two 20 solar mass models that contain helium, these models are found to be self-consistent in the sense that the formation of carbon through the triple-alpha process during premain sequence contraction is not sufficient to bring the CN cycle into competition with the proton-proton chain on the ZAMS. The zero-metal models of the present study have higher surface and central temperatures, higher central densities, smaller radii, and smaller convective cores than do the population I models with the same masses.

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