J/AJ/110/2400 BVI photometry of V728 Her (Nelson+ 1995)
Observations and analysis of the field contact binary V728 Herculis
Nelson R.H., Milone E.F., VanLeeuwen J., Terrell D., Penfold J.E.,
Kallrath J.
<Astron. J. 110, 2400 (1995)>
=1995AJ....110.2400N 1995AJ....110.2400N
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☉ and 0.295±0.009M☉ and
the radii are 1.784±0.015R☉ and 0.867±0.054R☉,
respectively. The determined temperature difference, T2-T1 is
165±19K, and the luminosities for components 1 and 2 are
5.5±0.5L☉ and 1.4±0.3L☉, 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 1988IBVS.3201....1N (Nelson et al.)
1988IBVS.3234....1A 1988IBVS.3234....1A (Agerer et al.)
1989BAAS...21..746S 1989BAAS...21..746S (Samec and Butcher)
1989IBVS.3356....1S 1989IBVS.3356....1S (Samec and Butcher)
Origin: AAS CD-ROM series, Volume 6, 1996 Lee Brotzman [ADS] 1-May-1996
(End) [CDS] 05-Sep-1996