J/AJ/113/1073ivo://CDS.VizieR/J/AJ/113/1073doi:10.26093/cds/vizier.51131073CDSFry A.M.Carney B.W.2023-04-06T16:50:24Z1997-12-09T20:40:11ZCDS support team

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

cds-question@unistra.frvariable-starsline-intensitiesWe have completed spectroscopic studies of 23 Galactic cepheids to determine possible metallicity effects on measuring the zero point of the P-L relation. We find a spread of 0.4dex in [Fe/H], which is not the result of either observational scatter or of a metallicity gradient within the Galactic disk. We find a smaller, less significant spread of 0.2dex in [{alpha}/Fe]. Our results are robust, determined by constancy of [Fe/H] derived at differing temperatures throughout the pulsational cycle, and abundances of two dwarfs compared to U Sgr in the cluster M25. We discuss briefly the effect of metallicity on the P-L relation. We also argue that EV Sct and QZ Nor are overtone pulsators, and that the latter is not a member of the cluster NGC 6067. (Copyright) 1997 American Astronomical Society.1997AJ....113.1073Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/113/1073CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/113/1073https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/113/1073http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/113/1073https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/113/1073https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/113/1073http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/113/1073GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/113/1073/table2Equivalent widths of Fe I and Fe IINameStar namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintphi[0/1[? Phasetime.phasefloatlambdaLine wavelength0.1nmem.wlfloatEW? Equivalent width0.1pmspect.line.eqWidthfloatIonIon designationphys.atmol.ionizationcharlog(gf)? log of oscillator strengthphys.atmol.wOscStrengthfloatChi? Chi valueeVphys.energy;phys.atmol.excitationfloatJ/AJ/113/1073/table3Equivalent widths of Alpha-peak elementsIonIon designationphys.atmol.ionizationcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryphi[0/1[? Phasetime.phasefloatlambdaLine wavelength0.1nmem.wlfloatEW? Equivalent width0.1pmspect.line.eqWidthfloatlog(gf)? log of oscillator strengthphys.atmol.wOscStrengthfloatChi? Chi valueeVstat.fit.chi2float