THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 94:687-722, 1994 October

    OLD STELLAR POPULATIONS. V. ABSORPTION FEATURE INDICES FOR THE COMPLETE
                           LICK/IDS SAMPLE OF STARS

         GUY WORTHEY, S. M. FABER, J. JESUS GONZALEZ, AND D. BURSTEIN

                                 ABSTRACT
 
        Twenty-one optical absorption features, 11 of which have been
     previously defined, are automatically measured in a sample of 460
     stars.  Following Gorgas et al., the indices are summarized in fitting
     functions that give index strengths as functions of stellar
     temperature, gravity, and [Fe/H].  This project was carried out with
     the purpose of predicting index strengths in the integrated light of
     stellar populations of different ages and metallicities, but the data
     should be valuable for stellar studies in the Galaxy as well.  Several
     of the new indices appear to be promising indicators of metallicity
     for old stellar populations.  A complete list of index data and
     atmospheric parameters is available in computer-readable form.

     Subject headings: galaxies: stellar content -- stars: abundances --
                       stars: atmospheres -- stars: fundamental parameters