DDO METAL ABUNDANCES OF HIGH-LUMINOSITY LATE-TYPE STARS IN GALACTIC OPEN CLUSTERS

Results from UBV and DDO photometry are presented for 54 high-luminosi ty late-type stars in the fields of 23 open clusters. The probability of cluster membership for each observed star is evaluated using two in dependent photometric criteria. It is found that 32 stars are very lik ely cluster members, the remaining ones being almost certainly field o bjects. The recently improved calibrations of the DDO system have been used to derive MK spectral types, effective temperatures, and metalli cities, while E(B - V) color excesses have been determined through kno wn photometric and spectroscopic procedures. The DDO metallicities ran ge between values typical of moderately metal-poor ([Fe/H]similar or e qual to-0.3) to moderately metal-rich ([Fe/H]similar or equal to 0.2) clusters. The masses of the cluster giants range between 1 and 4 solar masses, with the scatter within a cluster being less than 1 M(.).