S. Ortolani et al., THE LOW GALACTIC LATITUDE METAL-RICH GLOBULAR-CLUSTER NGC-6440, Astronomy & Astrophysics. Supplement series, 108(3), 1994, pp. 653-659
NGC 6440 is another case of bulge high metallicity globular cluster wi
th particular colour magnitude diagram properties, like those of NGC 6
553, NGC 6528 and Terzan 1. We present V and I observations of NGC 644
0, and find a reddening of E(B - V) approximate to 1.00 +/- 0.1, and a
distance of d(.) approximate to 8.47 kpc. The colour magnitude diagra
m morphology shows characteristics very similar to those of NGC 6553 a
nd NGC 6528, in particular the horizontal branch clump almost superimp
osed on the giant branch, and a curved upper giant branch, showing tha
t NGC 6440 also has a metallicity close to solar. The observations are
available in electronic form at the CDS (ftp 130.79.128.5).