J/AJ/137/236ivo://CDS.VizieR/J/AJ/137/236doi:10.26093/cds/vizier.51370236CDSYang Y.-G.Lu G.-L.Yin X.-G.Zhu C.-H.Nakajima K.2017-06-19T07:57:02Z2011-10-14T14:56:14ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryBased on O-C curves, we present detailed period investigations of two weak-contact binaries CC Com and BV Dra. It is found that the periods of these two binaries have varied in a cyclic variation way superposed on a secular period change. The periods and amplitudes of the cyclic variations are P_3_=23.6(+/-0.4)yr and A=0.0028(+/-0.0003)d for CC Com and P_3_=23.8(+/-0.6)yr and A=0.0029(+/-0.0003)d for BV Dra.2009AJ....137..236Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/137/236CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/137/236https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/137/236http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/137/236https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/137/236https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/137/236http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/137/236GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 4.920466254354166e-19OpticalInfrareddefaultJ/AJ/137/236/table3CCD photometric observations in BVRI-bands of the eclipsing binary CC ComRmag? R band magnitudemagphot.mag;em.opt.RfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-BB band Heliocentric Julian Datedtime.epochdoubleBmagB band magnitudemagphot.mag;em.opt.BfloatHJD-V? V band Heliocentric Julian Datedtime.epochdoublenullableVmag? V band magnitudemagphot.mag;em.opt.VfloatnullableHJD-R? R band Heliocentric Julian Datedtime.epochdoublenullableHJD-I? I band Heliocentric Julian Datedtime.epochdoublenullableImag? I band magnitudemagphot.mag;em.opt.IfloatnullableJ/AJ/137/236/table5CCD photometric observations in V-band of the eclipsing binary BV DrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleDVmagDifferential V band magnitudemagphot.mag;em.opt.V;arith.difffloatJ/AJ/137/236/table6All available light minimum times for CC Comae BerenicesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEpochEpoch (phase since reference epoch)time.phasedoubleMethMethod of observation (G1)meta.code;obscharType[I II] Primary (I) or Secondary (II) minimummeta.code;src.varchar(O-C)The (O-C) valuestat.fit.residualfloatResLight minimum time residualstat.fit.residualfloatJ/AJ/137/236/table7All photometric and CCD light minimum times for BV DrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEpochEpoch (phase since reference epoch)time.phasedoubleMethMethod of observation (G1)meta.code;obscharType[I II] Primary (I) or Secondary (II) minimummeta.code;src.varchar(O-C)The (O-C) value from Eq (3), linear ephemerisstat.fit.residualfloat(O-C)1The (O-C) value from Eq (4), linear ephemeris, least-squares fitting methodstat.fit.residualfloat(O-C)2The (O-C) value from Eq (5), non-linear method, upward parabolic curve and a sinusoidal onestat.fit.residualfloatRefReference, in refs.dat filemeta.ref;pos.frame;meta.fileintJ/AJ/137/236/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintprimaryBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar