J/AJ/110/2400 J/AJ/110/2400 BVI photometry of V728 Her R H Nelson E F Milone J Van Leeuwen D Terrell J E Penfold J Kallrath Astron. J. 110 2400 1995 1995AJ....110.2400N Photometry Stars, variable 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.

V728 Her17 18 04.4+41 50 40

HJD-2440000 Heliocentric Julian Day number - 2440000 d Phase Phase Phase computed according to E0 = 2446949.83672, P=0.4712866 d --- Bmag (Var-comp.) differential Johnson B mag mag Vmag (Var-comp.) differential Johnson V mag mag Icmag (Var-comp.) differential Cousins I mag mag CDS 1996Sep05AAS CD-ROM series, Volume 6, 1996 Lee Brotzman [ADS] 1-May-1996 J_AJ_110_2400.xml