A new, cleaner colour-magnitude diagram for the metal-rich globular cluster NGC 6528 - Velocity dispersion in the Bulge, age and proper motion of NGC 6528

Details A new, cleaner colour-magnitude diagram for the metal-rich globular cluster NGC 6528 - Velocity dispersion in the Bulge, age and proper motion of NGC 6528 A new, cleaner colour-magnitude diagram for the metal-rich globular cluster NGC 6528 - Velocity dispersion in the Bulge, age and proper motion of NGC 6528

2002-01-22

arxiv.org/abs/astro-ph/0201363v1

Astron.Astrophys. 385 (2003) 67

Astronomy and Astrophysics

Astrophysics

19 pages, Latex, A&A macro included, 3 ascii tables included (to be published electronically in the journal) . A&A in press

Scientific paper

10.1051/0004-6361:20011771

Using two epochs of HST/WFPC2 images of the metal-rich globular cluster NGC 6528 we derive the proper motions of the stars and use them to separate the stars belonging to NGC 6528 from those of the Galactic bulge. The stellar sequences in theresulting colour-magnitude diagram for the cluster are significantly better determined than in previously published data. From comparison of the colour-magnitude diagram with the fiducial line for NGC 6553 from Zoccali et al. (2001) we conclude that the two globular clusters have the same age. Further, using alpha-enhanced stellar isochrones, NGC 6528 is found to have an age of 11+-2 Gyr. This fitting of isochrones also give that the cluster is 7.2 kpc away from us. From the measured velocities both the proper motion of the cluster and the velocity dispersion in the Galactic bulge are found. NGC 6528 is found to have a proper motion relative to the Galactic bulge of mu_l=0.006 and mu_b=0.044 arcsec per century. Using stars with 14

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