HST VI photometry and proper motions in NGC 6528 (Feltzing+, 2002)

Details HST VI photometry and proper motions in NGC 6528 (Feltzing+, 2002) HST VI photometry and proper motions in NGC 6528 (Feltzing+, 2002)

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..33850067f&link_type=abstract

VizieR On-line Data Catalog: J/A+A/385/67. Originally published in: 2002A&A...385...67F

Computer Science

Clusters: Globular, Photometry, Proper Motions

Scientific paper

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 the resulting 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. (2001AJ....121.2638Z) 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+/-2Gyr. This fitting of isochrones also give that the cluster is 7.2kpc 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 =0.006 and =0.044 arcsec per century. Using stars with 14

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