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A new age diagnostic applied to the globular clusters NGC 288 and NGC 362A new age diagnostic for globular clusters is described which uses the difference between the turnoff and the base of the giant branch as the age indicator. As a first application, it is shown that there is a difference in age of 3.1 + or - 0.9 Gyr between the classic 'second parameter' pair NGC 288 and NGC 362. The existence of this age difference is independent of metal abundance differences between the two clusters of up to 0.5 dex. This age difference is corrected for various combinations of relative oxygen enhancement, and it is concluded that the difference in age remains significant for all plausible scenarios.
Document ID
19910033176
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sarajedini, Ata
(Yale Univ. New Haven, CT, United States)
Demarque, Pierre
(Yale University New Haven, CT, United States)
Date Acquired
August 15, 2013
Publication Date
December 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A17799
Funding Number(s)
CONTRACT_GRANT: NSF AST-89-14519
CONTRACT_GRANT: NAGW-777
CONTRACT_GRANT: NAGW-778
Distribution Limits
Public
Copyright
Other

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