Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 360, Issue 2, Pages 655-661Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2005.09054.x
Keywords
open clusters and associations : general; open clusters and associations : individual : Ruprecht 4; open clusters and associations : individual : Ruprecht 7; open clusters and associations : individual : Pismis 15
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We report on BVI CCD photometry to V = 22.0 for three fields centred on the region of the Galactic star clusters Ruprecht 4, Ruprecht 7 and Pismis 15 and on three displaced control fields. Ruprecht 4 and Pismis 15 have never been studied before, and we provide, for the first time, estimates of their fundamental parameters, namely, radial extent, age, distance and reddening. Ruprecht 7 (Berkeley 33), however, was studied by Mazur, Kaluzny & Krzeminski. We find that the three clusters are all of intermediate age (0.8-1.3 Gyr), and with a metallicity close to or lower than solar.
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