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We present photometry of the globular clus- ters NGC 6256 in V , I, NGC 6717, NGC 6256 in V , I, and NGC 6717 in B, V , obtaining cluster parameters. NGC 6256 has a post core-collapse structure, while such feature is suspected for NGC 6717. Both clusters are pro- jected on the bulge. From the colour-magnitude diagrams for NGC 6256 we derive reliable cluster parameters which considerably revise its properties, with respect to previous literature. It has a blue-extended Horizontal Branch already observed in other post-core collapse clusters in the bulge, such as HP1. We derive a reddening of E(B V )=1 :10, a dis- tance d 6:4 kpc, and an intermediate metallicity for NGC 6256. NGC 6717 presents a blue Horizontal Branch. We de- rive a reddening of E(B V )=0 :23 and a distance d 7:1 kpc, locating the cluster in the bulge. The photometry is deep and we study the luminosity func- tion, which presents some evidence of depletion of Main Sequence stars. This eect is not unexpected for such a poorly populated Palomar cluster in the bulge. We also estimate the cluster age from the magnitude dierence between the horizontal branch and the turno. We obtain V TO HB =3 :7, which would place this interme- diate metallicity bulge globular as coeval with the halo.

Colour-magnitude diagrams of the post-core collapse globular clusters NGC 6256 and NGC 6717 (Palomar 9)