Multicolor NTT Photometry of the Anomalous Globular Cluster NGC 288

Details Multicolor NTT Photometry of the Anomalous Globular Cluster NGC 288 Multicolor NTT Photometry of the Anomalous Globular Cluster NGC 288

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.2626a&link_type=abstract

Astronomical Journal v.114, p.2626

Astronomy and Astrophysics

Astronomy

10

Globular Clusters: Individual: Ngc 288, Stars: Horizontal-Branch

Scientific paper

We present UBV photometry of 2494 stars in a 38 arcmin square field in the anomalous high latitude globular cluster NGC 288 observed with a CCD camera and the 3.5 m NTT at ESO/La Silla. Our results can be summarized as follows: VTO=18.90±0.l4, and turnoff colors at (B-V)TO=0.46±0.05, (U - B)TO= -0.02±0.05 and independently (U - V)TO=0.45±0.07 (estimated external uncertainties). By fitting the resulting B - V ridge line to the theoretical isochrones of Bergbusch & VandenBerg (1992, ApJS, 81, 163) with [Fe/H]=-1.26, Y=0.2358, and [O/Fe]=+0.55, we derive the following values: the apparent distance modulus, (m - M)V = 14.85±0.10 and the interstellar reddening E(B - V) =0.04±0.02, and an age of 14±2 Gyr. We note the presence of approximately 17 blue stragglers, 4 hot faint BHB stars, and 5 faint possibly variable stars.

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