Journal Article

BS 196: an old star cluster far from the Small Magellanic Cloud main body*

E. Bica, J. F. C. Santos and A. A. Schmidt

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 2, pages 915-921
Published in print December 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI:
BS 196: an old star cluster far from the Small Magellanic Cloud main body*

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We present B and V photometry of the outlying Small Magellanic Cloud (SMC) star cluster BS 196 with the 4.1-m SOAR telescope. The photometry is deep (to V ≈ 25), showing ≈3 mag below the cluster turnoff point at MV= 2.5 (1.03 M). The cluster is located at the SMC distance. The colour–magnitude diagram and isochrone fittings provide a cluster age of 5.0 ± 0.5 Gyr, indicating that this is one of the 12 oldest clusters so far detected in the SMC. The estimated metallicity is [Fe/H]=−1.68 ± 0.10. The structural analysis gives by means of the King profile fittings a core radius Rc= 8.7 ± 1.1 arcsec(2.66 ± 0.14 pc) and a tidal radius Rt= 69.4 ± 1.7 arcsec(21.2 ± 1.2 pc). BS 196 is rather loose with a concentration parameter c= 0.90. With MV=−1.89 ± 0.39, BS 196 belongs to the class of intrinsically fainter SMC clusters, which have started to be explored as compared to the well-known populous ones.

Keywords: Magellanic Clouds; galaxies: star clusters

Journal Article.  4141 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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