CDROM/AJ/V110/P2400     V728 Her (Nelson+ 1995)
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Observations and Analysis of the Field Contact Binary V728 Herculis
      R. H. Nelson, E. F. Milone, J. VanLeeuwen, Dirk Terrell, J. E. Penfold, &
      J. Kallrath
      <1995, AJ, 110, 2400>
      =1995AJ....110.2400N
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Abstract:
  The W UMa system V728 Her has been observed photometrically in B, V,
  and I_C passbands at the RAO over five seasons and spectroscopically at
  DAO over three seasons to obtain radial velocities.  New times of
  minima are provided and a period analysis confirms previous
  ephemerides.  The light and radial velocity curves were analyzed with
  the latest University of Calgary enhancements to the Wilson-Devinney
  program and new solutions found.  The best model is that involving a
  contact system with convective atmospheres.  In probing the best
  solution possible, use was made of the enhanced reflection and
  second-order limb-darkening calculations available in the 1993 version
  of the WD program.  The mass ratio is found to be 0.1786 +/- 0.0023.
  The contact parameter is found to be f = 0.71 +/- 0.11.  The masses are
  determined to be 1.654 +/- 0.037 Msun and 0.295 +/- 0.009 Msun and the
  radii are 1.784 +/- 0.015 Rsun and 0.867 +/- 0.054 Rsun, respectively.
  The determined temperature difference, T2 - T1 is 165 +/- 19 K, and the
  luminosities for components 1 and 2 are 5.5 +/- 0.5 Lsun and 1.4 +/-
  0.3 Lsun, respectively.

File Summary:
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File Name    Lrecl    Records   Explanations
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table1.dat      39        696   V728 Her photoelectric observations
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units   Label      Explanations
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   1- 9   D9.4   HJD     HJD        Heliocentric Julian Day number - 2440000
  10-18   F9.5   ---     Phase     *Phase
  19-25   F7.3   mag     B          []? (Var - comp.) differential Johnson B mag
  26-32   F7.3   mag     V          (Var - comp.) differential Johnson V mag
  33-39   F7.3   mag     Ic         []? (Var - comp.) differential Cousins I mag
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Notes for file: table1.dat
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Phase:
  Phase computed according to E0 = 2446949.83672, P=0.4712866 d
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(End)                                             Lee Brotzman [ADS]  1-May-1996