On the metallicity and the turnoff age of NGC 188

Details On the metallicity and the turnoff age of NGC 188 On the metallicity and the turnoff age of NGC 188

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..710h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Sept. 1990, p. 710-718.

Astronomy and Astrophysics

Astronomy

38

Metallicity, Open Clusters, Stellar Evolution, Stellar Spectra, Abundance, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Iron, Oscillator Strengths, Stellar Luminosity, Stellar Temperature

Scientific paper

The model atmospheres of Kurucz (1979) are used to analyze the high-dispersion echelle spectra of seven stars located within the turnoff region of NGC 188. This approach yields Fe/H = -0.12 + or - 0.16 and effective temperatures of the turnoff stars of 5885 + or - 120 K. A turnoff age of 7.7 + or - 1.4 Gyr is then derived by comparing the deduced upper limit on the turnoff temperatures with the appropriate isochrones in the theoretical H-R diagram. These conclusions are effectively independent of the values assumed for the reddening, the intrinsic colors, and the distances of the cluster stars, with their associated uncertainties.

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