CDROM/AJ/V109/P0543      Color of Bright Galaxies (Buta & Williams 1995)
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Total and Effective Colors of 501 Galaxies in the Cousins VRI Photometric System
      R. Buta & Kesha L. Williams
      <1995, AJ, 109, 543>
      =1995AJ....109..543B
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Abstract:
  Total color indices (V-R)_T, (V-I)_T and effective color indices
  (V-R)_e, (V-I)_e in the Cousins VRI photometric system are presented
  for 501 mostly normal galaxies. The colors are computed using a
  procedure outlined in the Third Reference Catalogue of Bright Galaxies
  (RC3) whereby standard color curves approximated by Laplace-Gauss
  integrals are fitted to observed photoelectric multiaperture
  photometry.  11 sources of such photometry were used for our analysis,
  each source being assigned an appropriate weight according to a
  rigorous analysis of residuals of the data from the best-fitting
  standard color curves.  Together with the integrated B-V and U-B colors
  provided in RC3, our analysis widens the range of wavelength of
  homogeneously defined colors of normal galaxies of all Hubble types.
  We present color-color and color-type relations that can be modeled to
  understand the star formation history of galaxies.


File Summary:
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File Name    Lrecl    Records   Explanations
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table5.dat      80        501   Total and effective V-R and V-I color indices
                                for 501 galaxies
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Byte-by-byte Description of file: table5.dat
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   Bytes Format  Units    Label      Explanations
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   1-12   A12    ---      Object     Object name in various catalgues
  13-14   2X     ---      ---        Blank
  15-17   I3     ---      RC3        Numerical stage index in revised Hubble
                                       system, from the RC3
  18-20   I3     ---      N          Number of observations of V-R
  21-26   F6.2   mag      V-R_T      []? Total V-R color index
  27-33   F7.3   mag      e_V-R_T    []? V-R_T internal mean error
  34-39   F6.2   mag      V-I_T      []? Total V-I color index
  40-46   F7.3   mag      e_V-I_T    []? V-I_T internal mean error
  47-52   F6.2   mag      V-R_e      []? Effective V-R color index
  53-59   F7.3   mag      e_V-R_e    []? V-R_e internal mean error
  60-65   F6.2   mag      V-I_e      []? Effective V-I color index
  66-72   F7.3   mag      e_V-I_e    []? V-I_e internal mean error
  73-76   I4     ---      TSSC_B-V  *[]? Type index of B-V used to fit V-R
  77-80   I4     ---      TSSC_U-B  *[]? Type index of U-B used to fit V-I
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Notes for file: table5.dat
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TSSC_B-V:
  The type index of the B-V standard color curve used to fit V-R (see
  Figure 6 of the Second Reference Catalogue of Bright Galaxies, RC2);
  T(SCC)= 20 refers to a curve of zero integrated color gradient.

TSSC_U-B:
  The type index of the U-B standard color curve used to fit V-I (see
  Figure 6 of RC2); T(SCC)= 20 refers to a curve of zero integrated
  color gradient.
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(End)                                             Lee Brotzman [ADS] 29-Apr-1995