High quality seeing V, I and Gunn Z imaging of Terzan 4: a blue horizontal branch bulge globular cluster.

Details High quality seeing V, I and Gunn Z imaging of Terzan 4: a blue horizontal branch bulge globular cluster. High quality seeing V, I and Gunn Z imaging of Terzan 4: a blue horizontal branch bulge globular cluster.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..850o&link_type=abstract

Astronomy and Astrophysics, v.319, p.850-854

Astronomy and Astrophysics

Astrophysics

14

Globular Clusters: Individual: Terzan 4, M 30, General, Hr Diagram, Galaxy: Center

Scientific paper

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 dsun_=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.

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