NAME:
  col2teff
 PURPOSE:   (one line only)
  Find a black-body temperature for a star based on a photometric color
 DESCRIPTION:
 CATEGORY:
  Astronomy
 CALLING SEQUENCE:
  col2teff,wv,zp,color,teff
 INPUTS:
  wv - two element vector with the pivot wavelength for each filter in the
         color.  Example, color could be (V-R) so you provide the wavelength
         for V and R.  Units are in microns.
  zp - System photometric Vegamag constant for each filter in the color.
  color - color magnitude that matches wv and zp
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  teff - Black-body temperature that will reproduce the color.
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2021/09/01