J/other/NewA/41.ivo://CDS.VizieR/J/other/NewA/41.17CDSLi K.Hu S.Guo D.Jiang Y.Gao D.Chen X.2017-07-03T14:25:45Z2017-02-17T08:01:22ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsWe presented BVRcIc light curves of BX Peg obtained by the Weihai Observatory 1.0m telescope of Shandong University. The W-D code was used to analyze the four color light curves, it is shown that BX Peg is a W-subtype shallow contact binary with a fill-out factor of f=14.6%. The asymmetric light curves were explained by a dark spot on the less massive hot component. A total of 328 times of minimum light were used to study the orbital period variation of BX Peg. We found that the orbital period of BX Peg was continuous decrease with a rate of dp/dt=-2.07x10^-7^d/yr superimposed on a cyclic oscillation with a period of 57.8yr. The secular period decrease should be caused by the angular momentum loss via magnetic stellar wind. The cyclic modulation is very likely to be produced by the light travel time effect due to a tertiary companion.2015NewA...41...17Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/41.17CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/PASP/121/1366 : BVR light curves of BX Peg (Lee+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/41.17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/41.17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/41.17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/41.17https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/41.17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/41.17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/other/NewA/41.17/table4Times of minimum light for BX PegrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleMethMethod used (CCD, pe, pg or vis)meta.code;obscharType[ps] Type of eclipse, primary or secondarymeta.codecharEEpoch of minimum lightdtime.epochdoubleO-C1O-C determined by the linear ephemeris of Eq. (1) of the paperdtime;arith.difffloatO-C2O-C which remove the quadratic term from the (O-C)1dtime;arith.difffloatResResidual from full ephemeris of Eq. (2) of the paperdstat.fit.residualfloatRefReference (1)meta.ref;pos.framechar