Journal Article

Deep and wide photometry of the two open clusters NGC 1245 and NGC 2506: CCD observation and physical properties

S. H. Lee, Y.-W. Kang and H. B. Ann

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 2, pages 1567-1575
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21593.x
Deep and wide photometry of the two open clusters NGC 1245 and NGC 2506: CCD observation and physical properties

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Abstract

We have conducted VI CCD photometry of the two open clusters NGC 1245 and NGC 2506 using the CFH12K CCD camera. Our photometry covers a sky area of 84 × 82 and 42 × 81 arcmin2 for the two clusters, respectively, and reaches down to V ≈ 23. We derived the physical parameters using detailed theoretical isochrone fittings using χ2 minimization. The derived cluster parameters are E(BV) = 0.24 ± 0.05 and 0.03 ± 0.04, (VMV)0 = 12.25 ± 0.12 and 12.47 ± 0.08, age (Gyr) = 1.08 ± 0.09 and 2.31 ± 0.16, and [Fe/H] = −0.08 ± 0.06 and −0.24 ± 0.06, respectively, for NGC 1245 and NGC 2506. We present the luminosity functions of the two clusters, which reach down to MV ≈ 10, and derive mass functions with slopes of Γ = −1.29 for NGC 1245 and Γ = −1.26 for NGC 2506. The slopes are slightly shallower than that of the solar neighbourhood, implying the existence of dynamical evolution that drives the evaporation of the low-mass stars in the clusters.

Keywords: methods: observational; techniques: photometric; open clusters and associations: individual: NGC 1245; open clusters and associations: individual: NGC 2506

Journal Article.  4923 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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