The intermediate-age open cluster NGC 2112

Details The intermediate-age open cluster NGC 2112 The intermediate-age open cluster NGC 2112

2002-06-06

arxiv.org/abs/astro-ph/0206094v1

Mon.Not.Roy.Astron.Soc. 336 (2002) 259

Astronomy and Astrophysics

Astrophysics

7 pages, 7 eps figures, in press in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05735.x

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 $E_{B-V}= 0.63\pm0.14$ 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.

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