Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99.1248f&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Dec. 1987, p. 1248-1260.
Other
18
Charge Coupled Devices, Globular Clusters, Stellar Spectrophotometry, Abundance, Color-Magnitude Diagram, Data Reduction, Stellar Models, Tables (Data), Ubv Spectra
Scientific paper
The authors present results of CCD photometry in B and V for the globular cluster NGC 4147. The color-magnitude diagram reaches fainter than V = 22, some 3 magnitudes below the main-sequence turnoff. The morphology of the C-M diagram resembles that of a cluster of intermediate metallicity with a normal blue horizontal branch. Rough estimates of the integrated light from additional CCD data in B and I suggest, however, that the population revealed in the C-M diagram from the outer regions may not be representative of the population in the central regions of the cluster. Determination of the age of the cluster from fitting theoretical isochrones is difficult because of uncertainties in the distance modulus of the cluster. An age of 17 Gyr is implied. The revised Yale isochrones indicate an age of some 2 Gyr younger. If models with enhanced oxygen abundances are used, the ages deduced would also be 2 - 3 Gyr younger. Although determinations of the absolute age of NGC 4147 require knowledge of the absolute distance scale and choice of theoretical models, these alternative age estimates are consistent with those made for other clusters using the same models.
Christian Carol A.
Friel Eileen D.
Heasley James N. Jr.
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