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J/ApJ/527/199    HST observations of old clusters in the LMC (Johnson+, 1999)
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Hubble space telescope observations of the oldest star clusters in the large
Magellanic cloud.
    Johnson J.A., Bolte M., Stetson P.B., Hesser J.E., Somerville R.S.
   <Astrophys. J. 527, 199 (1999)>
   =1999ApJ...527..199J
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ADC_Keywords: Clusters, globular ; HR diagrams ; Magellanic Clouds ; Photometry
Mission_Name: HST
Keywords: blue stragglers - globular clusters: individual (NGC 1466, i
          NGC 2257, Hodge 11) - Magellanic Clouds

Abstract:
    We present V, V-I color-magnitude diagrams (CMDs) for three old star
    clusters in the Large Magellanic Cloud (LMC): NGC 1466, NGC 2257, and
    Hodge 11. Our data extend {~}3 mag below the main-sequence turnoff,
    allowing us to determine accurate relative ages and the blue straggler
    frequencies. Based on a differential comparison of the CMDs, any age
    difference between the three LMC clusters is less than 1.5 Gyr.
    Comparing their CMDs to those of M92 and M3, the LMC clusters, unless
    their published metallicities are significantly in error, are the same
    age as the old Galactic globulars. The similar ages to Galactic
    globulars are shown to be consistent with hierarchical clustering
    models of galaxy formation. The blue straggler frequencies are also
    similar to those of Galactic globular clusters. We derive a true
    distance modulus to the LMC of (m - M)_0_ = 18.46 {+/-} 0.09 [assuming
    (m - M)_0_ = 14.61 for M92] using these three LMC clusters.

Objects:
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       RA   (2000)   DE    Designation(s)
    ------------------------------------------------------
    03 44 33     -71 40.3  NGC 1466 = ESO 54- 16
    06 30 12     -64 19.6  NGC 2257 = ESO 87- 24
    06 14 23     -69 50.8  Hodge 11 = Shapley-Lindsay 868
    ------------------------------------------------------

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table2a.dat       49    17196   V and I photometry of NGC 1466
table2b.dat       49    15303   V and I photometry of NGC 2257
table2c.dat       49    17741   V and I photometry of Hodge 11
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See also:
   J/MNRAS/300/665 : HST VI Photometry of Six LMC Old Globular Clusters
     (Olsen+ 1998)

Byte-by-byte Description of file: table2*.dat
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   Bytes Format Units   Label     Explanations
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   1-  6  F6.2  pix     Xpos      X pixel position on Chip
   9- 14  F6.2  pix     Ypos      Y pixel position on Chip
  17- 22  F6.3  mag     Vmag      V band magnitude
  25- 29  F5.3  mag   e_Vmag      Uncertainty in Vmag
  33- 38  F6.3  mag     V-I       (V-I) color
  41- 45  F5.3  mag   e_V-I       Uncertainty in V-I
      49  I1    ---     Chip      Chip number (1 is the PC chip)
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History:
    From ApJ electronic edition

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(End)                                          Greg Schwarz [AAS]    06-Mar-2000