A new age diagnostic applied to the globular clusters NGC 288 and NGC 362

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169472· OSTI ID:6160979

Sarajedini, A; Demarque, P ^[1]

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1. Yale Univ., New Haven, CT (USA)

A 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. 46 refs.

• OSTI ID: 6160979
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 365; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
AGE ESTIMATION
DIAGNOSTIC TECHNIQUES
ELEMENT ABUNDANCE
ELEMENTS
FLUIDS
GALACTIC EVOLUTION
GASES
HELIUM
MAIN SEQUENCE STARS
NONMETALS
RARE GASES
STAR CLUSTERS
STAR EVOLUTION
STARS