Abstract
We have investigated the area of two NGC entries, NGC 1817 and NGC 1807, with deep CCD photometry in the uvby-Hbeta intermediate-band system. The photometric analysis of a selected sample of stars of the open cluster NGC 1817 yields a reddening value of E(b-y) = 0.19 +/- 0.05, a distance modulus of V-0-M-V = 10.9 +/- 0.6, a metallicity of [Fe/H] = -0.34 +/- 0.26 and an age of log t = 9.05 +/- 0.05. Our measurements allow us to confirm that NGC 1807 is not a physical cluster.
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