Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-03
Astron.J.122:2569-2586,2001
Astronomy and Astrophysics
Astrophysics
Accepted by The Astronomical Journal - 30 pages, 6 tables, 14 figures, LaTeX, the emulateapj5.sty macro is used. Fig. 2 and Fi
Scientific paper
10.1086/323711
We present deep V,I photometry of the globular clusters NGC 288, NGC 362 and NGC 1851 obtained during a single observational run under strictly homogeneous conditions. We use the bimodal horizontal branch (HB) of NGC 1851 as a ``bridge'' to obtain the optimum relative match between the HBs of NGC 288 and NGC 362. In this way we can effectively remove the uncertainties associated with distance, reddening and inhomogeneities in the absolute calibration, thus obtaining a very robust, purely differential estimate of the age difference between these two clusters. According to the bridge test, NGC 288 is found to be older than NGC 362 by 2 +- 1 Gyr. This result is fully confirmed also by all classical differential age diagnostics, either based on the luminosity or color of the main sequence turnoff point.
Bellazzini Michele
Catelan Márcio
Ferraro Francesco R.
Fusi Pecci Flavio
Galleti Silvia
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