J/A+AS/116/497ivo://CDS.VizieR/J/A+AS/116/497CDSImbert M.1997-12-09T18:06:57Z1997-12-09T19:06:53ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsvariable-starsContinued radial velocity observations over several years, have allowed to discover four spectroscopic binary systems among our sample of twenty five galactic Cepheids. Each system is composed by the Cepheid and an invisible probably hot dwarf star. A spectroscopic orbit has been determined for each system. The orbital periods for RX Cam, MW Cyg, Z Lac and U Vul are 1113, 439, 383 and 2510 days, respectively. For the pulsation motion, radial velocity versus phase diagram have been fitted by an analytic relation, formally similar to a Kepler motion. The stellar radius variation of each cepheid has been derived by integration of this relation over the whole pulsating period.1996A&AS..116..497Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/116/497CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/116/497https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/116/497http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/116/497https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/116/497https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/116/497http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/116/497GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/116/497/table2Observed and calculated radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharOBSdateUT date of observation (ddmmyy.hhmm).time.epochdoubleHJDHeliocentric Julian datedtime.epochdoubleVobsObserved velocitykm/sphys.velocfloatVcalCalculated velocity (1)km/sphys.veloc;pos.heliocentricfloatVobs-VcalObserved - calculated radial velocitykm/sstat.fit.omc;phys.velocfloatRefSource references (2)meta.refintJ/A+AS/116/497/table5Pulsation component of the radial velocity (Coravel measures)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharOBSdateObservation date (ddmmyy.hhmm)time.epochdoubleHJDHeliocentric Julian datedtime.epochdoublePhase[0/1[ Phasetime.phasefloatRVpulPulsation component of the radial velocitykm/sphys.veloc;pos.heliocentricfloat