Helium abundance variation among Galactic Globular Clusters

Details Helium abundance variation among Galactic Globular Clusters Helium abundance variation among Galactic Globular Clusters

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..305c&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 3, Feb. 1980, p. 305-307.

Astronomy and Astrophysics

Astrophysics

6

Abundance, Galactic Clusters, Galactic Structure, Globular Clusters, Helium, Metallic Stars, Red Giant Stars, Stellar Structure

Scientific paper

The ratio R between Horizontal Branch stars and Red Giant stars has been used to estimate the helium abundance (Y) in Galactic Globular Clusters. From available number counts of the two kinds of stars one hopes to derive some evidence for a variation of Y according to the overall metallicity of the cluster. The effect of probable observational errors is discussed.
It is suggested that Y may be correlated with the second evolutionary parameter required to explain some "peculiar" Globular Clusters.

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