J/MNRAS/430/2018ivo://CDS.VizieR/J/MNRAS/430/2018doi:10.26093/cds/vizier.74302018CDSSzabados L.Derekas A.Kiss L.L.Kovacs J.Anderson R.I.Kiss CS.,Szalai T.Szekely P.Christiansen J.L.2024-07-21T20:14:05Z2017-08-24T14:17:50ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopic-binary-starsradial-velocityWe present the analysis of photometric and spectroscopic data of six bright Galactic Cepheids: GH Carinae, V419 Centauri, V898 Centauri, AD Puppis, AY Sagittarii and ST Velorum. Based on new radial velocity data (in some cases supplemented with earlier data available in the literature), these Cepheids have been found to be members in spectroscopic binary systems. V898 Cen turned out to have one of the largest orbital radial velocity amplitude (>40km/s) among the known binary Cepheids. The data are insufficient to determine the orbital periods nor other orbital elements for these new spectroscopic binaries. These discoveries corroborate the statement on the high frequency of occurrence of binaries among the classical Cepheids, a fact to be taken into account when calibrating the period-luminosity relationship for Cepheids. We have also compiled all available photometric data that revealed that the pulsation period of AD Pup, the longest period Cepheid in this sample, is continuously increasing with {Delta}P=0.004567d/century, likely to be caused by stellar evolution. The wave-like pattern superimposed on the parabolic O-C graph of AD Pup may well be caused by the light-time effect in the binary system. ST Vel also pulsates with a continuously increasing period. The other four Cepheids are characterized with stable pulsation periods in the last half century.2013MNRAS.430.2018Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/430/2018CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/430/2018https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/430/2018http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/430/2018https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/430/2018https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/430/2018http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/430/2018GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/430/2018/table1 (Basic data of the programme stars and the number of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/430/2018/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/430/2018/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/430/2018/table1?GETtext/xml+votable180.050000true167.6858139-60.75028170.0055555555555555566/29104 37856 37926 37963 37993 39892https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/430/2018?format=asciiOpticaldefaultJ/MNRAS/430/2018/table1Basic data of the programme stars and the number of spectraStarStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint<Vmag>Mean V magnitudemagphot.mag;em.opt.VfloatPerPerioddtime.perioddoubleModeMode of pulsationmeta.code;src.varcharNobsNumber of observationsmeta.numbercharFileName1Name of the table with radial velocities from SSO spectrummeta.id;meta.filecharFileName2Name of the table with CORALIE radial velocitiesmeta.id;meta.filecharVCShow the Radial Velocity curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/430/2018/table3New RV values of GH Carinae from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table4New CORALIE velocities of GH CarinaerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table6New RV values of V419 Centauri from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table9New RV values of V898 Centauri from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table13New RV values of AD Puppis from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table15New RV values of AY Sagittarii from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatJ/MNRAS/430/2018/table17New RV values of ST Velorum from the SSO spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloat