V, I , and Gunn z imaging of Terzan 4 (Ortolani+ 1997)

Details V, I , and Gunn z imaging of Terzan 4 (Ortolani+ 1997) V, I , and Gunn z imaging of Terzan 4 (Ortolani+ 1997)

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ycat..33190850o&link_type=abstract

VizieR On-line Data Catalog: J/A+A/319/850. Originally published in: 1997A&A...319..850O

Other

Clusters: Globular, Photometry

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 d&sun;=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).

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