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J/AJ/110/2400              BVI photometry of V728 Her (Nelson+ 1995)
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Observations and analysis of the field contact binary V728 Herculis
     Nelson R.H., Milone E.F., Van Leeuwen J., Terrell D., Penfold J.E.,
     Kallrath J.
    <Astron. J. 110, 2400 (1995)>
    =1995AJ....110.2400N
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ADC_Keywords: Stars, variable ; Photometry

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+/-0.037M_{sun}_ and 0.295+/-0.009M_{sun}_ and
    the radii are 1.784+/-0.015R_{sun}_ and 0.867+/-0.054R_{sun}_,
    respectively. The determined temperature difference, T2-T1 is
    165+/-19K, and the luminosities for components 1 and 2 are
    5.5+/-0.5L_{sun}_ and 1.4+/-0.3L_{sun}_, respectively.

Objects:
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        RA   (2000)   DE      Designation(s)
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     17 18 04.4   +41 50 40   V728 Her
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File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
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  F9.4   d       HJD-2440000  Heliocentric Julian Day number - 2440000
  11- 18  F8.5   ---     Phase       *[0/1[ Phase
  20- 25  F6.3   mag     Bmag         []? (Var-comp.) differential Johnson B mag
  27- 32  F6.3   mag     Vmag         (Var-comp.) differential Johnson V mag
  34- 39  F6.3   mag     Icmag        []? (Var-comp.) differential Cousins I mag
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Note on Phase: Phase computed according to E0 = 2446949.83672, P=0.4712866 d
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References:
    1988IBVS.3201....1N (Nelson et al.)
    1988IBVS.3234....1A (Agerer et al.)
    1989BAAS...21..746S (Samec and Butcher)
    1989IBVS.3356....1S (Samec and Butcher)

Origin: AAS CD-ROM series, Volume 6, 1996         Lee Brotzman [ADS]  1-May-1996
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(End)                                                         [CDS]  05-Sep-1996