The age of the oldest globular clusters

Details The age of the oldest globular clusters The age of the oldest globular clusters

1996-03-18

arxiv.org/abs/astro-ph/9603092v1

Astronomy and Astrophysics

Astrophysics

submitted to The Astrophysical Journal Letters

Scientific paper

10.1086/303909

The age of three of the oldest clusters -- M15, M68, M92 -- has been redetermined. We use the latest EOS and opacity data available for calculating both isochrones and zero age horizontal branches and employ the brightness difference between turn-off and horizontal branch to determine the cluster age. Our best ages for all three clusters are about 13 Gyr, and even smaller ages are possible. Our results help to reconcile cluster ages with recent results on the age of the universe determined from the Hubble constant.

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