Photometry of the Outer Halo Globular Clusters NGC 5024 and NGC 5053
Abstract
New CCD photometry of the low-metallicity outer halo globular clusters NGC 5024 and NGC 5053 is used to construct BV color-magnitude diagrams that reach approximately 2 mag fainter than the turnoff in these clusters. A differential comparison of the color-magnitude diagrams with that of M92 indicates that all three clusters are identical in age to within the uncertainties of the observations. With the addition of these two clusters, color-magnitude diagrams are now available for more than half of the globular clusters with Fe/H less than -2.0, and with the exception of Ruprecht 106, no discernible spread in age among these clusters is detected.
- Publication:
-
The Astronomical Journal
- Pub Date:
- March 1991
- DOI:
- 10.1086/115740
- Bibcode:
- 1991AJ....101..967H
- Keywords:
-
- Astronomical Photometry;
- Galactic Evolution;
- Globular Clusters;
- Stellar Evolution;
- Color-Magnitude Diagram;
- Halos;
- Metallicity;
- Milky Way Galaxy;
- Ubv Spectra;
- Astrophysics;
- CLUSTERS: GLOBULAR