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http://dx.doi.org/10.5303/JKAS.2010.43.5.141

UBV I CCD PHOTOMETRY OF THE OPEN CLUSTERS NGC 4609 AND HOGG 15  

Kook, Seung-Hwa (Department of Astronomy and Space Science, Sejong University)
Sung, Hwan-Kyung (Department of Astronomy and Space Science, Sejong University)
Bessell, M.S. (Research School of Astronomy and Astrophysics, Australian National University)
Publication Information
Journal of The Korean Astronomical Society / v.43, no.5, 2010 , pp. 141-152 More about this Journal
Abstract
UBV I CCD photometry is obtained for the open clusters NGC 4609 and Hogg 15 in Crux. For NGC 4609, CCD data are presented for the first time. From new photometry we derive the reddening, distance modulus and age of each cluster - NGC 4609 : E(B-V ) = $0.37{\pm}0.03$, $V_0-M_V=10.60{\pm}0.08$, log $\tau$= 7.7 $\pm$ 0.1; Hogg 15 : E(B - V ) = 1.13 $\pm$ 0.11, $V_0-M_V$ = 12.50 $\pm$ 0.15, log $\tau$ $\lesssim$ 6.6. The young age of Hogg 15 strongly implies that WR 47 is a member of the cluster. We also determine the mass function of these clusters and obtain a slope $\Gamma$ = -1.2 ($\pm$0.3) for NGC 4609 which is normal and a somewhat shallow slope (${\Gamma}=-0.95{\pm}0.5$) for Hogg 15.
Keywords
color-magnitude diagrams (H-R diagram); open clusters and associations: individual (NGC 4609 & Hogg 15);
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