MULTICOLOR CCD PHOTOMETRY OF THE SMC CLUSTER KRON-3

Citation
G. Alcaino et al., MULTICOLOR CCD PHOTOMETRY OF THE SMC CLUSTER KRON-3, The Astronomical journal, 112(5), 1996, pp. 2004-2012
Citations number
22
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046256
Volume
112
Issue
5
Year of publication
1996
Pages
2004 - 2012
Database
ISI
SICI code
0004-6256(1996)112:5<2004:MCPOTS>2.0.ZU;2-K
Abstract
We present BVRI CCD photometry of 3149 stars in the SMC populous clust er Kron 3. Radial dependence of the horizontal branch morphology has b een revealed. Contrary to Rich et al. (1984, ApJ, 286,517), we conclud e that the cluster radius is about r=6'. We estimate the cluster metal licity as [Fe/H]=-1.26 and its apparent distance modulus as (m-M)=18(m ).75. Our estimate of the cluster age, based on fitting isochrones of VandenBerg & Bell (1985, ApJs, 58, 561) to our V-(B-V) and V-(V-R) dia grams, is about 10 Gyr, the lower limit being 8 Gyr; this value is gre ater than those derived earlier, presumably partially due to the dista nce modulus values used by earlier investigators being too large. Our age estimate is not far from the upper value from Rich et al. (C) 1996 American Astronomical Society.