Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1688b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1688-1698.
Astronomy and Astrophysics
Astronomy
130
Astronomical Photometry, Galactic Evolution, Globular Clusters, Abundance, Charge Coupled Devices, Color-Magnitude Diagram, Metallicity
Scientific paper
A differential comparison of precise CCD photometry in the globular clusters NGC 288, NGC 362, and NGC 1261 shows that differences exist in the positions of the main-sequence turnoff in these clusters that are most naturally explained if NGC 288 is some 3 billion yr older than NGC 362 and about 1 to 2 billion yr older than NGC 1261. This implies that the formation time for the Galactic halo is significantly longer than a freefall time. Consideration of the inferred ages and horizontal-branch morphologies of the clusters Pal 12, NGC 288, NGC 362, and NGC 1261, all with similar metal abundances, suggests that age may be the parameter that, after overall metal abundance, most determines horizontal-branch morphology.
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