The ages of Galactic globular clusters

Details The ages of Galactic globular clusters The ages of Galactic globular clusters

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..686s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, July-Aug. 1987, p. 686-695. In Russian.

Astronomy and Astrophysics

Astronomy

1

Globular Clusters, Milky Way Galaxy, Stellar Evolution, Stellar Models, Ubv Spectra, Horizontal Branch Stars, Metallicity, Stellar Luminosity

Scientific paper

Evolutionary modelling of the integrated B-V colour is used to determine ages of 10 globular clusters of our Galaxy. None of the clusters referred to has an age older than 15 billion years, unlike previous estimates using the turn-off luminosity or effective temperature (up to 18 - 20 billion years). It is argued that metal-poor globular clusters ([Fe/H] < -1.2) are 4 - 5 billion years older than metal-rich ones. In the metallicity range -1.3 - -2.3 there is no metallicity-age correlation for this globular clusters sample.

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