J/MNRAS/362/1167ivo://CDS.VizieR/J/MNRAS/362/1167doi:10.26093/cds/vizier.73621167CDSPetterson O.K.L.Cottrell P.L.Albrow M.D.Fokin A.2024-07-01T20:15:13Z2006-07-09T20:20:05ZCDS support team

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

cds-question@unistra.frvariable-starsradial-velocityspectroscopyWe present high-resolution spectroscopic observations and species-by-species radial velocities of a number of southern Cepheids. The stars (BP Cir, V350 Sgr, AX Cir, V636 Sco, W Sgr, S Mus, {beta} Dor, TT Aql, Y Oph, YZ Car, SW Vel, X Pup, T Mon and l Car) were observed as part of a long-term programme at Mt John University Observatory. Radial velocities were determined with the line bisector technique, and have a precision of ~300m/s. Velocity differences as large as 30km/s were found for H and Ca II when referenced to the metallic line velocity curves, but more subtle variations (of 12km/s) were also detected in many other species. Pulsational phase anticorrelations are found between lines of Si II and Ba II, confirming the propagation time delay between line-forming layers producing these two species. We find that the amplitude and phase differences between the various species increase with period.2005MNRAS.362.1167Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/362/1167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/137/209 : Southern Cepheids BVIc photoelectric obs. (Berdnikov+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/362/1167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/362/1167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/362/1167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/362/1167https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/362/1167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/362/1167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/362/1167/table1 (Cepheid periods)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/362/1167/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/362/1167/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/362/1167/table1?GETtext/xml+votable180.050000true221.6749211-61.46194280.0055555555555555566/23622 28779 28991 29665 30321 33804 37303 37340 37867 39933 41608 41737 41761 42297https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/362/1167?format=asciiOpticaldefaultJ/MNRAS/362/1167/table1Cepheid periodsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.maincharprimaryEpochEpochJDtime.epochdoublePerPerioddtime.perioddoubler_PerSource for periodmeta.bibcharPlotPlot of the radial velocity vs timemeta.ref.urlcharSimbadSimbad column added by the CDSchar_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/362/1167/tableaVelocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCepheid namemeta.id;meta.maincharJDJulian datedtime.epochdoublePhase[0/1] Phasetime.phasefloatRV? Radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullableMVelMetallic velocitykm/sspect.dopplerVelocfloatHaVel? H{alpha} velocitykm/sspect.dopplerVelocfloatnullableCaIIVel? Ca II velocitykm/sspect.dopplerVelocfloatnullableCaIVelCa I velocitykm/sspect.dopplerVelocfloatBaIIVelBa II velocitykm/sspect.dopplerVelocfloatFeIVelFe I velocitykm/sspect.dopplerVelocfloatFeIIVel? Fe II velocitykm/sspect.dopplerVelocfloatnullableSiIVelSi I velocitykm/sspect.dopplerVelocfloatSiIIVelSi II velocitykm/sspect.dopplerVelocfloat