Solar calibration and the ages of the old disk clusters M67, NGC 188, and NGC 6791

Details Solar calibration and the ages of the old disk clusters M67, NGC 188, and NGC 6791 Solar calibration and the ages of the old disk clusters M67, NGC 188, and NGC 6791

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..151d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Jan. 1992, p. 151-162.

Physics

93

Calibrating, Solar Physics, Star Clusters, Stellar Evolution, Chronology, Color-Magnitude Diagram, Metallicity, Stellar Models

Scientific paper

The ages of the old disk star clusters M67, NGC 188, and NGC 6791 are derived on the basis of theoretical solar calibrated isochrones. The ages of M67 and NGC 188 were found to be about 4.0 +1.0 or -0.5 Gyr (close to the age of the sun) and 6.5 +1.5 or -0.5 Gyr, respectively. The age of NGC 6791 was found to be about 1.0 Gyr larger than that of NGC 188, assuming that the two clusters have the same metallicity. If, however, NGC 6791 is more metal rich, its age is less certain; it could be as low as 6.5 Gyr.

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