Dolidze 25 : a metal-deficient galactic open cluster.

High resolution spectra of three OB-type stars in the distant (5-6 kpc) anticenter galactic cluster Dolidze 25 have been analyzed using non-LTE and LTE model atmosphere techniques to derive atmospheric parameters and chemical compositions, respectively. The cluster appears to be significantly deficient in metals, with one star having underabundances for individual elements ranging from -0.55 to -0.93 dex with respect to the spectroscopic standard Tau Scorpii. This in conjunction with previous work on galactic clusters (Fitzsimmons et al. 1990, Gehren et al. 1985) implies that the variation of abundance with galactocentric distance is not linear and indeed may not be unique.