Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....142..163m&link_type=abstract
The Astronomical Journal, Volume 142, Issue 5, article id. 163 (2011).
Astronomy and Astrophysics
Astronomy
Globular Clusters: Individual: Ngc 6266
Scientific paper
The internal proper motion dispersion of NGC 6266 was measured using Hubble Space Telescope Wide Field Planetary Camera 2 images with an epoch difference of eight years. The dispersion was found to be 0.041 ± 0.001 arcsec century -1. This value was then equated to the cluster's radial velocity dispersion of 13.7 ± 1.1 km s-1 to yield a distance to NGC 6266 of 7054 ± 583 pc. Based on this distance we find that the NGC 6266 RR Lyrae stars have MV = 0.51 ± 0.18 mag. This magnitude is in good agreement with that predicted by the MV versus [Fe/H] relation found by Benedict et al. Using an average [Fe/H] of -1.25 for NGC 6266, their relation predicts MV = 0.49 ± 0.06. Based on the RR Lyrae MV versus age relation determined by Chaboyer et al., we estimate that NGC 6266 has an age of 11.4 ± 2.2 Gyr.
McKeever Jean
McNamara Bernard J.
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