Photometry of two metal-poor low-latitude globular clusters.
Abstract
The authors have undertaken a preliminary investigation of the metal-poor low-latitude globular clusters NGC 6293 and NGC 6333 using CCD images from the University of Hawaii 2.24-meter telescope, obtained on two nights when the seeing was about 0.6″ The color-magnitude (C-M) diagrams for the two clusters show well-defined giant branches and blue horizontal branches and reach just to the main-sequence turnoff. Their C-M diagram morphology resemble each other very closely as well as that of M92; a comparison of NGC 6293 and NGC 6333 with the latter yields probable reddening values of ≡0.47 and ≡0.44 mag and apparent distance modulii of ≡16.0 and ≡15.8, respectively, placing the clusters roughly 1 - 2 Kpc from the Galactic center.
- Publication:
-
The Formation and Evolution of Star Clusters
- Pub Date:
- 1991
- Bibcode:
- 1991ASPC...13..272J
- Keywords:
-
- Globular Clusters;
- Stellar Spectrophotometry;
- Charge Coupled Devices;
- Color-Magnitude Diagram;
- Image Analysis;
- Interstellar Extinction;
- Metallicity;
- Astrophysics;
- Globular Clusters: CCD Photometry;
- Globular Clusters: Metal Content;
- Globular Clusters: Reddening;
- Globular Clusters: Distances