CDROM/AJ/V111/P1596     Fornax Globulars (Smith+ 1996)
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Fornax Globular Clusters 1 and 5: A Confirmed Extragalactic Second Parameter
Pair
      Edgar O. Smith, James D. Neill, Kenneth J. Mighell, and R. Michael Rich
      <1996, AJ, 111, 1596>
      =1996AJ....111.1596S
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Abstract:
  We report new color-magnitude diagrams for Fornax globular clusters 1
  and 5 where our data reaches V = 24, below the horizontal branch.
  Using the index B-R/(B+V+R), a measure of the horizontal branch color,
  we find cluster 1 has a red (-0.50 +/- 0.10) and cluster 5 an
  intermediate color (-0.09 +/- 0.12) horizontal branch confirming the
  first extragalactic second parameter pair.  The HB types are markedly
  redder than the Galactic globular clusters at [Fe/H] = -2.  In globular
  cluster 1, we find 21 possible variable stars out of 41 horizontal
  branch stars.  Cluster 1 has an anomalously low ratio of horizontal
  branch to red giant stars, which formally gives a helium abundance of
  0.16 < Y < 0.22, depending on the assumptions used.  For both clusters
  1 and 5, and for the red horizontal branch in the field adjacent to
  cluster 5, V_HB = 21.25 +/- 0.05.  We give calibrated surface
  brightness profiles and measure new core and tidal radii for cluster 1
  of 17.6" and 104" and for cluster 5 of <2" and 91", respectively.


File Summary:
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File Name    Lrecl    Records   Explanations
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table3.dat      55        182   Fornax cluster 1 photometry
table4.dat      55        253   Fornax cluster 5 photometry
table.tex       66        489   AASTeX version of table3.dat and table4.dat
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Byte-by-byte Description of file: table3.dat table4.dat
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   Bytes Format  Units   Label      Explanations
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   1- 3   I3     ---     ID         Identification number
   4-11   F8.1   pix     X          X coordinate
  12-19   F8.1   pix     Y          Y coordinate
  20-26   F7.2   mag     V          V magnitude
  27-31   F5.2   mag     e_V        Error in V
  32-38   F7.2   mag     B          B magnitude
  39-43   F5.2   mag     e_B        Error in B
  44-50   F7.2   mag     B-V        B-V color
  51-55   F5.2   mag     e_B-V      Error in B-V
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(End)                                             Lee Brotzman [ADS] 03-May-1996