Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..76...73a&link_type=abstract
Astrophysics and Space Science, vol. 76, no. 1, May 1981, p. 73-81. Research supported by the Japan Society for the Promotion o
Astronomy and Astrophysics
Astrophysics
3
Abundance, Globular Clusters, Helium, Red Giant Stars, Star Clusters, Stellar Evolution, Big Bang Cosmology, Stellar Luminosity, Stellar Models
Scientific paper
The number ratios of horizontal branch stars to red giant stars are obtained for globular clusters and Draco galaxy and the helium abundance is estimated using model results both with and without a semiconvection zone (SCZ). The analysis is confined to four clusters (M4, M5, M13, and 47 Tuc) and the Draco galaxy, for which fairly precise star counts had been carried out. The effect of the difference in radial distribution between horizontal and red giant branch stars is taken into account. In the case of the fully developed SCZ, it is found that the helium abundance for M5 and Draco is appreciably smaller than the value given by the big-bang cosmology.
Arimoto Nobou
Simoda Mahiro
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