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J/AJ/110/652          VI photometry in NGC 6352 (Fullton+ 1995)
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A VIc color-magnitude diagram of the globular cluster NGC 6352 from Hubble
Space Telescope Planetary Camera observations
     Fullton L.K., Carney B.W., Olszewski E.W., Zinn R., Demarque P.,
     Janes K.A., Da Costa G.S., Seitzer P.
    <Astron. J. 110, 652 (1995)>
    =1995AJ....110..652F
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ADC_Keywords: Clusters, globular ; Photometry

Abstract:
    The globular cluster NGC 6352, which on the basis of its Galactic
    position, radial velocity, and [Fe/H] is a member of the (thick) disk
    system of globular clusters, has been observed to below the
    main-sequence turnoff (MSTO) using the Hubble Space Telescope. These
    observations, which were obtained before the repair mission, were
    analyzed using the flux-conserving iterative/recursive deconvolution
    algorithm developed at the University of North Carolina. This
    algorithm can produce more precise photometry than standard
    PSF-fitting methods with the aberrated images. The V, (V-Ic)
    color-magnitude diagram constructed from these observations places the
    cluster turnoff at V=18.80+/-0.10. Observations with the CTIO 0.9m
    telescope have been used to photometer the brighter stars in the
    cluster, providing a calibration of the HST data and an estimate of
    the cluster's reddening, E(B-V)=0.21+/-0.03. From spectroscopic
    observations of the strengths of the Ca II triplet lines in red giants
    in the cluster and from previous measurements in the literature, we
    find that NGC 6352 is only slightly more metal rich
    (Delta[Fe/H]=0.08+/-0.05) than the prototypical disk globular cluster,
    47 Tuc. From the difference in V magnitude between the horizontal
    branch and the MSTO, we find that NGC 6352 is essentially the same age
    as 47 Tuc (formally, older by 0.7+/-2.2Gyr). Comparisons with the
    latest Yale isochrones support this result and yield 14.5+/-2Gyr
    for the age of 47 Tuc from the photometry of Hesser et al.
    (1987PASP...99..739H), which is consistent with other determinations.
    The old age obtained for NGC 6352 provides additional evidence that
    the disk system of globular clusters is very old and is in fact older
    or comparable in age to several globular clusters populating the
    Galactic halo.

Description:
  Tables CD-1, CD-2, and CD-3 contain the photometric data used to
  generate the color-magnitude diagrams in the printed paper. The tables
  themselves were not printed in the paper, but were provided by the
  authors for publication on the AAS CD-ROM Series.

File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
tablecd1.dat    58       2649   Ground-based data
tablecd2.dat    50       2074   HST cluster data
tablecd3.dat    50        245   HST comparison field data
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Byte-by-byte Description of file: tablecd1.dat
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   Bytes Format  Units      Label      Explanations
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   1-  4  I4     ---        ID         Star identification
   6- 10  I5     ---        SN         []? Cross-id from Sarajedini & Norris
                                         (1994ApJS...93..161S)
  12- 18  F7.3   pix        Xpos       X coordinate
  20- 26  F7.3   pix        Ypos       Y coordinate
  28- 34  F7.3   mag        Vmag       V magnitude
  36- 42  F7.3   mag      e_Vmag       Sigma of Vmag measurement
  44- 50  F7.3   mag        V-Ic       V-Ic color
  52- 58  F7.3   mag      e_V-Ic       Sigma of V-Ic measurement
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Byte-by-byte Description of file: tablecd2.dat, tablecd3.dat
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   Bytes Format  Units      Label      Explanations
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   1-  2  I2     ---        Chip       Chip number
   4-  7  I4     ---        ID         Star identification number
   8      A1     ---      n_ID         [*] Indicates no other star on the frame
                                          within 15 pixels
  10- 15  F6.2   pix        Xpos       X coordinate
  17- 22  F6.2   pix        Ypos       Y coordinate
  24- 29  F6.3   mag        Vmag       V magnitude
  31- 36  F6.3   mag      e_Vmag       Sigma of Vmag measurement
  38- 43  F6.3   mag        V-Ic       V-Ic color
  45- 50  F6.3   mag      e_V-Ic       Sigma of V-Ic measurement
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References:
  Sarajedini & Norris 1994 ApJS, 93, 16  =1994ApJS...93..161S

Origin: AAS CD-ROM series, Volume 5, 1995         Lee Brotzman [ADS] 27-Sep-1995
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(End)                                                         [CDS]  10-Jan-1996