Zero-population stars

Details Zero-population stars Zero-population stars

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35..185c&link_type=abstract

Astrophysics and Space Science, vol. 35, June 1975, p. 185-196.

Astronomy and Astrophysics

Astrophysics

16

Giant Stars, Helium, Main Sequence Stars, Nuclear Fusion, Stellar Evolution, Abundance, Astronomical Models, Stellar Luminosity, Stellar Mass, Stellar Structure

Scientific paper

The expected characteristics of stars with zero metal content are investigated for a large range of masses and in varying the original helium-content. It is shown that, in such an extreme case (Z equals 0), the Main Sequence locus is much less sensitive than expected to the He-content; Y equals 0 models are found to ignite 3-alpha reactions in the Zero-Age Main Sequence at masses larger by about 5 solar masses than in the Y equals 0.2 case. A comparison with previous results discloses the M.S. slope to be a sensitive function of the metal content only. Evolutionary computations confirm that possible survivors of the zero population can develop a giant branch, akin to that of the well-known Population II stars.

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