The settling of helium and the ages of globular clusters

Details The settling of helium and the ages of globular clusters The settling of helium and the ages of globular clusters

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237l..15n&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 237, Apr. 1, 1980, p. L15, L16.

Astronomy and Astrophysics

Astrophysics

15

Cosmology, Globular Clusters, Stellar Evolution, Stellar Models, Abundance, Bolometers, Chronology, Helium, Stellar Luminosity, Stellar Magnitude, Stellar Mass

Scientific paper

Model low-mass globular-cluster stars were evolved with their helium allowed to diffuse under the influence of gravity, thermal diffusion, and concentration gradient. The evolution tended to speed up. Also, the turnoff point moved toward lower luminosity and slightly lower surface temperature. If the luminosity at turnoff is used as the sole criterion for determining the age of a globular cluster, the inferred ages of such clusters are reduced by about 22% from starting values in the vicinity of 15 billion years.

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