Analysis of UBV photometry in selected area 133

We interpret the de‐reddened UBV data for the field SA 133 to deduce the stellar density and metallicity distribution functions. The logarithmic local space density for giants, D*(0) = 6.40, and the agreement of the luminosity function for dwarfs and sub‐giants with the one of Hipparcos confirms the empirical method used for their separation. The metallicity distribution for dwarfs gives a narrow peak at Fe/H] = +0.13 dex, due to apparently bright limiting magnitude, V_o = 16.5, whereas late‐type giants extending up to z ～ 4.5 kpc from the galactic plane have a multimodal distribution. The metallicity distribution for giants gives a steep gradient dFe/H]/dz = –0.75 dex kpc^–1 for thin disk and thick disk whereas a smaller value for the halo, i.e. dFe/H]/dz = –0.45 dex kpc^–1. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)