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Friel, E.D., Janes, K.A., Tavarez, M., Scott, J., Katsanis, R., Lotz, J., Hong, L. and Miller, N. (2002) Metallicities of Old Open Clusters. Astronomical Journal, 124, 2693.
http://dx.doi.org/10.1086/344161

has been cited by the following article:

• TITLE: Optical and Infrared Photometric Study of Old Open Star Cluster Berkeley 39

  AUTHORS: A. Essam, I. M. Selim

  KEYWORDS: Galaxy, Open Clusters, Associations, Individual, Berkeley 39

  JOURNAL NAME: International Journal of Astronomy and Astrophysics, Vol.5 No.3, September 28, 2015

  ABSTRACT: In this paper we present astrophysical parameters of the very old open star cluster Berkeley 39 using 2MASS JHK data and observation of BV CCD photometry (V ~ 21.5 mag) in Johnson-Cousin filters. We have derived reddening, distance, metallicity and age etc. using two color diagrams in near-infrared and optical bands. We have found EB-V = 0.099 ± 0.02, EJ-H = 0.018 ± 0.001 and EJ-Ks = 0.016 ± 0.001 mag, and the distance modulus of (m-M) 0 = 13.24 ± 0.03 mag, which give a distance of 4.2 ± 0.04 Kpc, and the age of the cluster is 5.6 Gyr with metallicity; Z = 0.008 (obtained from fitting of the observed CMDs with Padova iso-chrones). The radius of the cluster obtained from the analysis of 2MASS data is equal 9.0 ± 0.13 arc minutes; it reflects that the cluster have large radius with new cluster center. Luminosity and mass functions have been investigated as well as the dynamical relaxation time of the cluster Berkeley 39.