J/AJ/110/2400ivo://CDS.VizieR/J/AJ/110/2400doi:10.26093/cds/vizier.51102400CDSNelson R.H.Milone E.F.VanLeeuwen J.Terrell D.Penfold J.E.,Kallrath J.2023-04-06T16:50:18Z1997-12-09T20:31:08ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starsphotometryThe 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.1995AJ....110.2400Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/110/2400CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/110/2400https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/110/2400http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/110/2400https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/110/2400https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/110/2400http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/110/2400GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/110/2400/table1V728 Her photoelectric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2440000Heliocentric Julian Day number - 2440000dtime.epochdoublePhase*[0/1[ Phasetime.phasedoubleBmag[]? (Var-comp.) differential Johnson B magmagphot.mag;em.opt.BfloatVmag(Var-comp.) differential Johnson V magmagphot.mag;arith.difffloatIcmag[]? (Var-comp.) differential Cousins I magmagphot.mag;em.opt.Ifloat