Empirical Calibration of Metallicity Indices for Single Stellar Populations

Details Empirical Calibration of Metallicity Indices for Single Stellar Populations Empirical Calibration of Metallicity Indices for Single Stellar Populations

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.2218i&link_type=abstract

Astronomical Journal v.109, p.2218

Astronomy and Astrophysics

Astronomy

27

Galaxies: Stellar Content, Stars: Abundances, Stars: Fundamental Parameters

Scientific paper

We report new data for a sample of 89 F-K stars, mostly metal-poor objects, extending the existing data basis to lower metallicities, found in galactic globular clusters. New fits, used in the present investigation, of the metallicity indices as a function of stellar parameters are also given. Moreover, we present new calibrations for the metallicity indices Mg2, and Na D [Faber et al., ApJS, 57, 711(1985)] obtained by empirical methods. Instead of deriving from theoretical isochrones the light contribution from the different evolutionary stages of a given stellar population, we use star counts of observed color-magnitude diagrams. From our calculations, we derived equations allowing the estimate of the metallicity for single stellar populations of age in the 14-16 Gyr range.

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