Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..135c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 135-140.
Astronomy and Astrophysics
Astrophysics
32
Abundance, Globular Clusters, Helium, Metallicity, Canonical Forms, Galactic Evolution, Horizontal Branch Stars, Main Sequence Stars
Scientific paper
Theoretical constraints have been derived from recent stellar model computations and these have been compared with some observational parameters of galactic globular clusters. The objective was to obtain information on the helium versus metallicity relationship for these very old systems. The first result is that the disagreement between the Y-[Fe/H] relations derived by different authors with different methods can be resolved when the "canonical" frame is abandoned and the CNO content as well as the He-core masses is allowed to vary with [Fe/H]. Under these hypotheses the authors derive a unique Y-[Fe/H] relation whose actual slope depends on the value of the coefficient a = [CNO/Fe]/[Fe/H]. The implication of varying a is analyzed, particulary as concerns the ratio ΔY/ΔZ. It is found that acceptable values of the ratio ΔY/ΔZ may be attained when a = -0.5 to -0.6.
Caputo Filippina
Cayrel Roger
Cayrel de Strobel G.
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