Abstract
ABSTRACT Washington CMT1T2 photometry of a sample of field red giants is compared with DDO colors obtained by McClure (1970) and Janes (1975) to determine the relative sensitivities of the metallicity indices of the two systems. Washington line-blanketing indices delta(M-T1) and delta(C-M) were derived, and found to correlate very well with each other, in addition to correlating quite well with the DDO metallicity index. Furthermore, any N/A or C/A abundance variations which may exist among the present sample of old disk giants do not appear to significantly effect the delta(C-M) index. The study indicates that delta(C-M) should provide a useful photometric metal abundance indicator, and is capable of providing estimates accurate to about + or - 0.2 dex over the Fe/H abundance range of +0.4 to -0.8.
Published Version
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