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6 Conclusions

In this paper we have presented a detailed study of the poorly known intermediate age open cluster King 5. By combining optical and IR photometry we have proved that King 5 is a moderate age open cluster about 1 Gyr old, intermediate in age between the Hyades and NGC 752.

By studying the CMD and two color digrams, we have obtained estimates for the cluster reddening and distance. In detail, we found that the color excesses E(J-K), E(V-I) and E(V-K) are 0.50, 1.10 and 2.45, respectively, and that their ratios are in agreement with the standard values (Cardelli et al. 1989). The derived corrected distance modulus (m-M)0 = 11.40 implies a distance of 1.9 kpc from the Sun.

Acknowledgements
G.C. acknowledges useful e-discussions with Prof. Ken Janes, and the anonymous referee who helped to improve the presentation of the paper. This study has been financed by the Italian Ministry of University, Scientific Research and Technology (MURST) and the Italian Space Agency (ASI).


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