J/AJ/112/2004 CCD photometry of SMC cluster Kron 3 (Alcaino+ 1996)
Multicolor CCD photometry of the SMC cluster Kron 3
Alcaino G., Liller W., Alvarado F., Kravtsov V., Ipatov A.,
Samus N., Smirnov O.
<Astron. J. 112, 2004 (1996)>
=1996AJ....112.2004A 1996AJ....112.2004A (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, CCD ; Clusters, open
Abstract:
We present BVRI CCD photometry of 3149 stars in the SMC populous
cluster Kron 3. Radial dependence of the horizontal branch morphology
has been revealed. Contrary to Rich et al. (1984ApJ...286..517R 1984ApJ...286..517R), we
conclude that the cluster radius is about r=6'. We estimate the
cluster metallicity as [Fe/H]=-1.26 and its apparent distance modulus
as (m-M)=18.75mag. Our estimate of the cluster age, based on fitting
isochrones of VandenBerg & Bell (1985ApJS...58..561V 1985ApJS...58..561V) to our V-(B-V)
and V-(V-R) diagrams, is about 10Gyr, the lower limit being 8Gyr; this
values is greater than those derived earlier, presumably partially due
to the distance modulus values used by earlier investigators being too
large. Our age estimate is not far from the upper values from
Righ et al. (1984ApJ...286..517R 1984ApJ...286..517R).
Objects:
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RA (2000) DE Designation(s)
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00 24 46.3 -72 47 37 Kron 3 = Lindsay 8
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 51 3149 CCD photometry in Kron 3
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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2- 5 I4 --- Seq Running number
7- 14 F8.3 pix Xpos x coordinate (along RA, increases to the east)
16- 23 F8.3 pix Ypos y coordinate (along DE, increases to the north)
25- 30 F6.3 mag Vmag V magnitude
32- 37 F6.3 mag B-V B-V color index
39- 44 F6.3 mag V-R ? V-R color index
46- 51 F6.3 mag V-I *? V-I color index
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Note on V-I: this column in the printed paper is inadvertently
labelled "R-I".
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Acknowledgements:
It is a pleasure to thank Prof. Nikolai N. Samus
for providing a copy of Table3 to CDS.
(End) Francois Ochsenbein [CDS] 16-Dec-1996