Extragalactic globular clusters. I - The metallicity calibration

Details Extragalactic globular clusters. I - The metallicity calibration Extragalactic globular clusters. I - The metallicity calibration

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..503b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 20, 1990, p. 503-521. Research supported by the Smithsonian Insti

Astronomy and Astrophysics

Astrophysics

154

Astronomical Spectroscopy, Globular Clusters, Infrared Radiation, Metallicity, Star Distribution, Cyanogen, Galactic Clusters, Hydrogen, Iron

Scientific paper

The ability of absorption-line strength indices, measured from integrated globular cluster spectra, to predict mean cluster metallicity is explored. Statistical criteria, are used to identify the six best indices out of about 20 measured in a large sample of Galactic and M31 cluster spectra. Linear relations between index and metallicity have been derived along with new calibrations of infrared colors (V - K, J - K, and CO) versus Fe/H. Estimates of metallicity from the six spectroscopic index-metallicity relations have been combined in three different ways to identify the most efficient estimator and the minimum bias estimator of Fe/H - the weighted mean. This provides an estimate of Fe/H accurate to about 15 percent.

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