HST observations of Terzan 1: a second parameter globular cluster in the galactic bulge

Hubble Space Telescope observations in the F555W and F814W bands are presen ted of the bulge globular cluster Terzan 1. This highly obscured cluster ha s the smallest projected distance to the Galactic center among all known gl obulars. Its colour-magnitude diagram shows a red horizontal branch, which is typical of metal-rich clusters, combined to a very steep red giant branc h, which instead is typical of metal-poor clusters. These features make it similar to the second parameter halo cluster NGC 362. Terzan 1 is therefore another second parameter cluster in the Galactic bulge, and the first one in the bulge combining a steep red giant branch with a red horizontal branc h. As in the case of NGC 362, these features of the colour-magnitude diagra m can be accounted for by the cluster being similar to 2 Gyr younger than o ther clusters with the same metallicity but showing a blue horizontal branc h. These findings demonstrate that second parameter effects are not confine d to the Galactic hare, but are actually encountered at all galactocentric distances. Despite the unusual sequences in the colour-magnitude diagram, t he derivation of reddening and distance is straightforward, and we obtained E(B - V) = 2.48+/-0.1, d. = 5.2+/-0.5 kpc, thus placing Terzan 1 within th e bulge.