J/other/NewA/31.ivo://CDS.VizieR/J/other/NewA/31.65CDSLiao W.-P.Qian S.-B.Zhao E.-G.Jiang L.-Q.2017-07-05T06:59:29Z2015-04-29T14:12:41ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyWide-band photometryLU Lac is a neglected W UMa binary star in photometric investigations. In this paper, we present BVRI CCD photometric light curves obtained on one night in 2012. The first photometric solutions of this system are computed by using the Wilson-Devinney code. It is shown that LU Lac is a marginal contact W-type system with a degree of contact factor of f=8.9%, a mass ratio of q=2.085 and a high inclination of i=82.20{deg}. From the first analyses of orbital period changes, we found the period variation of the system includes an oscillation (A3=0.0125-days and T3=51.92-years). The cyclic change may be attributed to the light-travel time effect through the presence of a third body.2014NewA...31...65Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/31.65CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/31.65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/31.65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/31.65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/31.65https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/31.65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/31.65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/other/NewA/31.65/table1BVRI observations of LU LacrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[BVRI] Observed bandinstr.bandpasscharHJDHeliocentric Julian date (HJD-2456100)dtime.epochdoubleDmagDifferential magnitude in bandmagphot.mag;arith.difffloat