The intermediate-age open cluster NGC 2112

Abstract

We report on $BVI$ CCD photometry of a field centered on the region of the intermediate-age open cluster NGC 2112 down to V=21. Due to the smaller field coverage, we are able to limit the effect of field star contamination which hampered in the past precise determinations of the cluster age and distance. This way, we provide updated estimates of NGC 2112 fundamental parameters. Having extended the photometry to the $I$ pass-band, we are able to construct a colour-colour diagram, from which we infer a reddening $E_{B-V}=0.63\pm 0.14$ mag. The comparison of the Colour-Magnitude Diagram (CMD) with theoretical isochrones leads to a distance of $850\pm 100$ pc, and an age of $2.0\pm 0.3$ Gyr. While the distance is in agreement with previous determinations, the age turns out to be much better constrained and significantly lower than previous estimates.

7 pages, 7 eps figures, in press in MNRAS

References in corpus (3)

• The intermediate-age open cluster NGC 2158
• Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11
• An optical and near IR study of the old open cluster NGC 2141

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