Photometry of the outer halo globular clusters NGC 5024 and NGC 5053

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115740· OSTI ID:5867743

Heasley, J N; Christian, C A ^[1]

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1. Hawaii Univ., Honolulu (USA) California Univ., Berkeley (USA)

New CCD photometry of the low-metallicity outer halo globular clusters NGC 5024 and NGC 5053 is used to construct BV color-magnitude diagrams that reach approximately 2 mag fainter than the turnoff in these clusters. A differential comparison of the color-magnitude diagrams with that of M92 indicates that all three clusters are identical in age to within the uncertainties of the observations. With the addition of these two clusters, color-magnitude diagrams are now available for more than half of the globular clusters with Fe/H less than -2.0, and with the exception of Ruprecht 106, no discernible spread in age among these clusters is detected. 27 refs.

• OSTI ID: 5867743
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
AGE ESTIMATION
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
ELEMENT ABUNDANCE
ELEMENTS
GALACTIC EVOLUTION
GALAXIES
HYDROGEN
IRON
METALS
MILKY WAY
NONMETALS
PHOTOMETRY
STAR CLUSTERS
STAR EVOLUTION
TRANSITION ELEMENTS