Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267...66o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 66-74.
Astronomy and Astrophysics
Astrophysics
42
Color-Magnitude Diagram, Globular Clusters, Metallicity, Astronomical Models, Astronomical Photometry, Charge Coupled Devices
Scientific paper
We present BVRI and Gunn z CCD photometry for the bulge metal-rich globular cluster Terzan 1. The RGB shows an anomalous shape, and the HB is extremely red. It is projected on a very metal-rich bulge population. We demonstrate that this cluster is strongly affected by blanketing in the B and V bands. From the I vs. (V-I) photometry, we obtained a reddening E(B-V) = 1.67, in agreement with previous JHK photometry estimate. We conclude that this cluster has a very high metallicity, as revealed by an anomalous RGB morphology, in particular in the V vs. (B-V) diagram, and an excess blanketing of Delta(V-I) = 0.8-0.9 relative to the Baade window population. These results should be considered in the modeling of metal-rich atmospheres and analyses of metal-rich composite spectra and photometric indices.
Barbuy Batriz
Bica Eduardo
Ortolani Sergio
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