CCD BV photometry of the old open cluster NGC 6791.
Abstract
CCD BV photometry to V = 20.5 of stars in the old open cluster NGC 6791 is presented. Comparison with the theoretical isochrones of VandenBerg gives a cluster age in the range of 10 to 12.5 Gyr, and an apparent distance modulus of 13.45 mag, adopting a solar metallicity. This cluster is only marginally younger than Palomar 12, which is the youngest globular cluster known. A search for short-period variables in the cluster field led to the discovery of only one low-amplitude variable, probably belonging to the FK Com-type stars. A very blue star was detected which may be an extremely young white dwarf formed in the cluster.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1990
- Bibcode:
- 1990MNRAS.243..492K
- Keywords:
-
- Astronomical Photometry;
- Charge Coupled Devices;
- Open Clusters;
- Variable Stars;
- Visual Photometry;
- Blue Stars;
- Color-Magnitude Diagram;
- Early Stars;
- Globular Clusters;
- Star Formation;
- White Dwarf Stars;
- Astrophysics