Deep CCD Photometry in Globular Clusters. VIII. M12
Abstract
Results are presented on UBV photometry, obtained using the Canada-France-Hawaii Telescope, for a single field (2.2 x 3.5 arcmin) located 3.5 arcmin from the center of the galactic globular cluster M12 (NGC 6218). The color-magnitude diagram (CMD) indicated a possible existence of a sequence of binary stars. The fundamental cluster parameters for M12 derived from the present data are E(B-V) = 0.23 + or - 0.04 and (m-M)V = 14.25 + or - 0.20. An overlay of the isochrones and the CMD yields a best-estimate age of 17 Gyr.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 1989
- DOI:
- 10.1086/115218
- Bibcode:
- 1989AJ.....98.1335S
- Keywords:
-
- Astronomical Photometry;
- Charge Coupled Devices;
- Globular Clusters;
- Binary Stars;
- Color-Magnitude Diagram;
- Horizontal Branch Stars;
- Mass Spectra;
- Metallicity;
- Astrophysics;
- CLUSTERS: GLOBULAR