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J/AJ/112/2004       CCD photometry of SMC cluster Kron 3 (Alcaino+ 1996)
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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        (SIMBAD/NED BibCode)
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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), 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) 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).

Objects:
    -----------------------------------------
       RA   (2000)   DE    Designation(s)
    -----------------------------------------
     00 24 46.3 -72 47 37  Kron 3 = Lindsay 8
    -----------------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table3.dat         51     3149   CCD photometry in Kron 3
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Byte-by-byte Description of file: table3.dat
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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 <samus@sai.msu.su>
    for providing a copy of Table3.dat to CDS.
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(End)                                     Francois Ochsenbein [CDS]  16-Dec-1996