J/MNRAS/434/870ivo://CDS.VizieR/J/MNRAS/434/870doi:10.26093/cds/vizier.74340870CDSSzabados L.Anderson R.I.Derekas A.Kiss L.L.Szalai T.Szekely P.,Christiansen J.L.2024-08-06T20:16:45Z2015-02-26T14:46:19ZCDS support team

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

cds-question@unistra.frvariable-starsradial-velocityWe present an analysis of spectroscopic radial velocity and photometric data of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum (RZ Vel) and BG Velorum (BG Vel). Based on new radial velocity data, these Cepheids have been found to be members of spectroscopic binary systems. The ratio of the peak-to-peak radial velocity amplitude to photometric amplitude indicates the presence of a companion for LR TrA and BG Vel. IUE spectra indicate that the companions of RZ Vel and BG Vel cannot be hot stars. The analysis of all available photometric data revealed that the pulsation period of RZ Vel and BG Vel varies monotonically, due to stellar evolution. Moreover, the longest period Cepheid in this sample, RZ Vel, shows period fluctuations superimposed on the monotonic period increase. The light-time effect interpretation of the observed pattern needs long-term photometric monitoring of this Cepheid. The pulsation period of LR TrA has remained constant since the discovery of its brightness variation. Using statistical data, it is also shown that a large number of spectroscopic binaries still remain to be discovered among bright classical Cepheids.2013MNRAS.434..870Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/434/870CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/434/870https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/434/870http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/434/870https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/434/870https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/434/870http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/434/870GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/434/870/table1 (Basic data of the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/434/870/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/434/870/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/434/870/table1?GETtext/xml+votable180.050000true232.7075833-65.59933330.0055555555555555566/37829 39244 41383https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/434/870?format=asciiOpticaldefaultJ/MNRAS/434/870/table1Basic data of the programme starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main<Vmag>Mean V magnitudemagphot.mag;em.opt.VfloatPerPerioddtime.perioddoublePulsMode of pulsation (Fundamental/First overtone)meta.notecharNSSO[10/30] Number of SSO spectrameta.numberintNCor[32/67] Number of Coralie spectrameta.numberintTSSO[3/11] Table number of SSO spectrameta.numberintTCor[4/12] Table number of Coralie spectrameta.numberintVCVelocity curvemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/434/870/table12CORALIE velocities of BG VelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVVelocity dispersionkm/sstat.errorfloat