The ages and compositions of old clusters

Details The ages and compositions of old clusters The ages and compositions of old clusters

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..206j&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 206-214.

Astronomy and Astrophysics

Astrophysics

84

Abundance, Chemical Composition, Cosmology, Globular Clusters, Heavy Elements, Stellar Evolution, Helium, Hubble Constant, Open Clusters, Stellar Color, Stellar Magnitude, Stellar Structure

Scientific paper

From published color-magnitude diagrams of 23 globular and open clusters the authors have measured the mean color index or absolute magnitude at various points along the principal sequences. By relating these quantities to the analogous parameters derived from theoretical isochrones it is possible to solve simultaneously for age, heavy-element abundance, and helium abundance. It is concluded that there is no correlation of globular cluster age with composition and that the oldest open clusters are about one-half the age of the globular clusters. The evidence suggests that the open clusters have a higher helium abundance than the globular clusters, that the globulars have an age of about 16.6 ± 0.5 Gyr, and that the metal-rich clusters 47 Tuc and M71 have [Fe/H] ≡ -0.9.

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