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J/AJ/111/1596            BV photometry in Fornax globulars (Smith+ 1996)
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Fornax globular clusters 1 and 5: A confirmed extragalactic second parameter
Pair
     Smith E.O., Neill J.D., Mighell K.J., Rich M.
    <Astron. J. 111, 1596 (1996)>
    =1996AJ....111.1596S
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ADC_Keywords: Clusters, globular ; Photometry

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.

Objects:
    ----------------------------------------------------------
        RA  (2000)   DE    Designation(s)
    ----------------------------------------------------------
      02 37 02   -34 11.0  Fornax cluster 1 = C 0235-344
      02 42 21   -34 06.2  Fornax cluster 5 = C 0240-343
    ----------------------------------------------------------

File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
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
   5- 11  F7.1   pix     Xpos       X coordinate
  13- 19  F7.1   pix     Ypos       Y coordinate
  21- 26  F6.2   mag     Vmag       V magnitude
  28- 31  F4.2   mag   e_Vmag       Error in Vmag
  33- 38  F6.2   mag     Bmag       B magnitude
  40- 43  F4.2   mag   e_Bmag       Error in Bmag
  45- 50  F6.2   mag     B-V        B-V color
  52- 55  F4.2   mag   e_B-V        Error in B-V
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Origin: AAS CD-ROM series, Volume 6, 1996         Lee Brotzman [ADS] 03-May-1996
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(End)                                                         [CDS]  05-Sep-1996