VizieR Online Data Catalog: V, I , and Gunn z imaging of Terzan 4 (Ortolani+ 1997)
Abstract
We study the globular cluster Terzan 4 projected close to the Galactic center, by means of V, I and Gunn z Colour-Magnitude Diagrams. The images were obtained under exceptional seeing conditions (0.35"-0.55") at the ESO New Technology Telescope equipped with SUSI. We derive a reddening of E(B-V)=2.35 and a distance from the Sun d⊙=8.3kpc for Terzan 4. From the similarity of the VI Colour-Magnitude Diagrams of Terzan 4 and M30, in particular the presence of a blue horizontal branch, it could be as metal-poor as [Fe/H]=~-2.0. It is therefore another blue horizontal branch globular cluster located close to the Galactic center. (2 data files).
- Publication:
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VizieR Online Data Catalog
- Pub Date:
- September 1996
- DOI:
- 10.26093/cds/vizier.33190850
- Bibcode:
- 1996yCat..33190850O
- Keywords:
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- Clusters: globular;
- Photometry