The Age of the Oldest Globular Clusters | Zendy

M. Salaris | Zendy; S. Degl’Innocenti | Zendy; Achim Weiß | Zendy

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The Age of the Oldest Globular Clusters

Author(s) -

M. Salaris,

S. Degl’Innocenti,

Achim Weiß

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/303909

Subject(s) - globular cluster , age of the universe , astrophysics , horizontal branch , physics , cluster (spacecraft) , magnitude (astronomy) , astronomy , universe , stars , computer science , de sitter universe , programming language

The age of three of the oldest clusters -- M15, M68, M92 -- has beenredetermined. We use the latest EOS and opacity data available for calculatingboth isochrones and zero age horizontal branches and employ the brightnessdifference 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 agesare possible. Our results help to reconcile cluster ages with recent results onthe age of the universe determined from the Hubble constant.Comment: submitted to The Astrophysical Journal Letter

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