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Title:
The old open cluster NGC 2112: updated estimates of fundamental parameters based on a membership analysis†
Authors:
Carraro, G.; Villanova, S.; Demarque, P.; Moni Bidin, C.; McSwain, M. V.
Affiliation:
AA(ESO, Casilla 19001, Santiago 19, Chile; Dipartimento di Astronomia, Università di Padova, vic. Osservatorio 3, Padova, Italy; Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile; Astronomy Department, Yale University, PO Box 208101 New Haven, CT 06520-8101, USA), AB(Dipartimento di Astronomia, Università di Padova, vic. Osservatorio 3, Padova, Italy; Departamento de Física, Facultad de Ciencias Físicas y Matemáticas Universidad de Concepción, Casilla 160-C, Concepción, Chile), AC(Astronomy Department, Yale University, PO Box 208101 New Haven, CT 06520-8101, USA), AD(Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile), AE(Astronomy Department, Yale University, PO Box 208101 New Haven, CT 06520-8101, USA; Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 3, pp. 1625-1634. (MNRAS Homepage)
Publication Date:
05/2008
Origin:
MNRAS
MNRAS Keywords:
open clusters and associations: general , open clusters and associations: individual: NGC 2112
DOI:
10.1111/j.1365-2966.2008.13143.x
Bibliographic Code:
2008MNRAS.386.1625C

Abstract

We report on a new, wide-field (20 × 20 arcmin2), multicolour (UBVI), photometric campaign in the area of the nearby old open cluster NGC 2112. At the same time, we provide medium-resolution spectroscopy of 35 (and high-resolution of additional 5) red giant and turn-off stars. This material is analysed with the aim to update the fundamental parameters of this traditionally difficult cluster, which is very sparse and suffers from heavy field star contamination. Among the 40 stars with spectra, we identified 21 bona fide radial velocity members which allow us to put more solid constraints on the cluster's metal abundance, long suggested to be as low as the metallicity of globulars. As indicated earlier by us on a purely photometric basis, the cluster [Fe/H] abundance is slightly supersolar ([Fe/H] = 0.16 +/- 0.03) and close to the Hyades value, as inferred from a detailed abundance analysis of three of the five stars with higher resolution spectra. Abundance ratios are also marginally supersolar.

Based on this result, we revise the properties of NGC 2112 using stellar models from the Padova and Yale-Yonsei groups.

For this metal abundance, we find that the cluster's age, reddening and distance values are 1.8 Gyr, 0.60 mag and 940 pc, respectively. Both the Yale-Yonsei and Padova models predict the same values for the fundamental parameters within the errors.

Overall, NGC 2112 is a typical solar neighbourhood, thin-disc star cluster, sharing the same chemical properties of F-G stars and open clusters close to the Sun.

This investigation outlines the importance of a detailed membership analysis in the study of disc star clusters.

This paper includes data gathered with the 6.5 Magellan Telescopes, located at Las Campanas Observatory, Chile.

The data discussed in this paper will be made available at the WEBDA open cluster data base http://www.univie.ac.at/webda, which is maintained by E. Paunzen and J.-C. Mermilliod. ‡

E-mail: gcarraro@eso.org (GC); sandro.villanova@unipd.it (SV); demarque@astro.yale.edu (PD); mbidin@das.uchile.cl (CMB); mcswain@lehigh.edu(MVM)

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