Photoelectric photometry on the extended Strömgren system ( uvbyCa ) is presented for 7 giants and 21 main sequence stars in the old open cluster , NGC 752 .
Analysis of the hk data for the turnoff stars yields a new determination of the cluster mean metallicity .
From 10 single-star members , [ Fe/H ] = -0.06 \pm 0.03 , where the error quoted is the standard error of the mean and the Hyades abundance is set at [ Fe/H ] = +0.12 .
This result is unchanged if all 20 stars within the limits of the hk metallicity calibration are included .
The derived [ Fe/H ] is in excellent agreement with past estimates using properly-zeroed m _ { 1 } data , transformed moderate-dispersion spectroscopy , and recent high dispersion spectroscopy .