UBVI CCD Photometry of the Open Cluster NGC 4609 and Hogg 15

Details UBVI CCD Photometry of the Open Cluster NGC 4609 and Hogg 15 UBVI CCD Photometry of the Open Cluster NGC 4609 and Hogg 15

2010-09-15

arxiv.org/abs/1009.2843v1

JKAS, 2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 14 figures, JKAS, in press

Scientific paper

UBVI 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 +/- 0.03, V_0 - M_V = 10.60 +/- 0.08, log tau = 7.7 +/- 0.1; Hogg 15 : E(B-V) = 1.13 +/- 0.11, V_0 - M_V = 12.50 +/- 0.15, log tau <= 6.6. The young age of Hogg 15 strongly implies that WR 47 is a member of the cluster. We have also determined the mass function of these clusters and have obtained a normal slope (Gamma = -1.2 +/- 0.3) for NGC 4609 and a somewhat shallow slope (Gamma = -0.95 +/- 0.5) for Hogg 15.

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