J/A+A/708/A216ivo://CDS.VizieR/J/A+A/708/A216CDSRipepi V.Trentin E.Catanzaro G.Marconi M.Bhardwaj A.Clementini G.,Cusano F.De Somma G.Molinaro R.Sicignano T.Storm J.2026-07-09T18:25:11Z2026-07-09T19:24:40ZCDS support team

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

cds-question@unistra.frvariable-starsstellar-distancephotometryspectroscopymetallicityThe C-MetaLL project has provided homogeneous spectroscopic abundances of 290 Classical Cepheids (DCEPs) for which we have the intensity-averaged magnitudes in multiple optical and near-infrared (NIR) bands, periods, pulsation modes, and Gaia parallaxes corrected for individual zero-point (ZP) biases. Our goal is to derive updated period-Wesenheit-metallicity (PWZ) relations using the largest and most homogeneous metallicity sample ever used for such analyses, covering a range of -1.3<[Fe/H]<+0.3dex, and to assess the metallicity dependence of these relations. We computed several optical and NIR Wesenheit magnitudes adopting both Cardelli et al. and Fitzpatrick reddening laws, and transformed Johnson-Cousins Wesenheit magnitudes into their HST equivalents using empirical relations. Using 275 DCEPs with reliable parallaxes, we applied a robust photometric parallax technique, which simultaneously fits all parameters --- including the global ZP counter-correction to Gaia parallaxes --- and handles outliers via a Cauchy likelihood to account for the sample's excess variance. We find a stronger metallicity dependence (gamma~-0.5mag/dex in optical, ~-0.4mag/dex in NIR) than recent literature reports. Gaia parallax ZP counter-correction epsilon varies smoothly across bands, with an average value of ~10 muas, aligning with previous determinations. Applying our PWZ relations to ~4500 LMC Cepheids yields distances generally consistent within 1 sigma with geometric estimates. The choice of reddening law has a small impact, while using only fundamental-mode pulsators significantly increases the uncertainties. Including alpha-element corrections increases abs(gamma) and reduces epsilon. However, we find 1 sigma consistency gamma values with the literature, particularly for the Wesenheit magnitude in the HST bands, by restricting the sample to brighter (i.e. closer) objects, or by including only pulsators with -0.7<[Fe/H]<0.2dex. Our results hint at a large gamma or a non-linear dependence on metallicity of DCEP luminosities at the metal-poor end, which is difficult to quantify with the precision of parallaxes of the present dataset.2026A&A...708A.216Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A216CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/508/4047 : 47 classical Cepheids HARPSN@TNG spectroscopyJ/A+A/681/A65 : Cepheids PL relation metallicity dependence (Trentin+, 2024)J/A+A/683/A234 : Cepheid Metallicity in the Leavitt Law SurveyJ/A+A/690/A246 : Cepheid radial abundance gradients (Trentin+, 2024)J/A+A/706/A225 : 23 Classical Cepheids abundances (Catanzaro+, 2026)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/708/A216https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A216http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A216https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A216https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A216http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A216GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/708/A216/tablea1 (Astrometric, photometric and spectroscopic data for 290 Galactic Classical Cepheids used in this paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A216/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A216/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A216/tablea1?GETtext/xml+votable180.050000true91.6456126.329220.0055555555555555565/9482 6/1445 1467 1653 1752 1858 1894 2684 3020 3045 3049 3059 3070 3182 3196 3310 3316 3329 3342 3361 3600 3616 3657 3665 12968 13032 13288 13963 13990 14205 14262 14271 14303 14337 14340 14353 14359 14388 14409 14431 14600 14607 14609 14618 14625 14660 14678 14718 15360 15379 15424 15432 15618 15638 20805 20818 20820 20822 20849 20854 20861-20863 20891 20945 20953 20958 20978 20980 20983 21509 21511 21514 21525 21546 21551 21600 21632 21634-21635 21638 21648 21664 21666 21672 21675 21677 21704 22024 22046-22047 22055 22073 22078 22090 22112 22165 22167 22203 22213 22218 22223 22432 23617 23620 23622-23623 23627 23630 23640 23643 23650 23659-23660 23727 23749 23755-23756 23764 23769 23797 23808 23852 23967 24088 24138 24145 24159 24327 24339 24347 24372 28717 28808 28893 28918 29081 29095 29102 29106 29126 29160 29166 29216 29249 29456 29510-29511 29521 29526 29897 30210-30211 30222 30243-30244 30260 30313 30401 30452 30646 30659 30688 30692 32067 37245 37325 37331 37340 37361 37706 37716 37734-37736 37739 37783 37791 37821 37833 37866 37904 37906 37918 37925 37936 38016-38017 38403 38408 39189 39191 39196 39199 39221 39225 39228-39230 39239 39314 39316-39317 39321 39326 39353 39364 39368 39390 39392 39406 39697 39708 39737 39743 39748-39749 39753-39755 39766 39771 39782 39784 39786 39790 39799 39824 39831 39837 39862 39871 39875 39880 39883-39885 39887 39889 39892 39894 39896 39898 39903 39905 39908 39919 39930 39933 40576 40634 41595 41626 41631 41651 41667 41674 41765 41769 42155 42224 42820 43020 43064 437227.952274030004205e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A216?format=asciidefaultJ/A+A/708/A216/tablea1Astrometric, photometric and spectroscopic data for 290 Galactic Classical Cepheids used in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarCommon name of the Starmeta.id;meta.maincharGaiaDR3Gaia DR3 source identificationmeta.idRA_ICRSRight ascension (ICRS) at Epoch=2000degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Epoch=2000degpos.eq.dec;meta.mainPPerioddtime.perioddoublePfundFundamentalised perioddtime.perioddoubleModeMode of pulsation (1)meta.codecharPlxGaia parallaxmaspos.parallaxfloate_PlxError on the Gaia parallaxmasstat.error;pos.parallaxfloatcorPlxCorrected Gaia parallaxmaspos.parallax.trigfloatgofGoodness-of-Fit of the astrometric solution (astrometric_gof_al)stat.fit.goodnessfloatruweRe-normalised Unit Weight Errorstat.errorfloatSimbadNameSimbad column added by the CDSmeta.idcharnullableGmagMagnitude in the G bandmagphot.mag;em.optfloate_GmagError on the G magnitudemagstat.error;phot.magfloatBPmagMagnitude in the BP bandmagphot.mag;em.opt.Bfloate_BPmagError on the BP magnitudemagstat.error;phot.magfloatRPmagMagnitude in the RP bandmagphot.mag;em.opt.Rfloate_RPmagError on the RP magnitudemagstat.error;phot.magfloatVmagMagnitude in the V bandmagphot.mag;em.opt.Vfloate_VmagError on the V magnitudemagstat.error;phot.magfloatImagMagnitude in the I bandmagphot.mag;em.opt.Ifloate_ImagError on the I magnitudemagstat.error;phot.magfloatJmagMagnitude in the J bandmagphot.mag;em.IR.Jfloate_JmagError on the J magnitudemagstat.error;phot.magfloatHmagMagnitude in the H bandmagphot.mag;em.IR.Hfloate_HmagError on the H magnitudemagstat.error;phot.magfloatKsmagMagnitude in the Ks bandmagphot.mag;em.IR.Kfloate_KsmagError on the Ks magnitudemagstat.error;phot.magfloat[Fe/H]Iron abundancephys.abund.Fefloate_[Fe/H]Error on the iron abundancestat.error;phys.abund.Fefloat[alpha/Fe]alpha over iron abundancephys.abundfloate_[alpha/Fe]Error on alpha over iron abundancestat.error;phys.abundfloatflagSourceFlag identification/Gaia photometry (2)meta.code.errorcharflagOptNirFlag photometry (3)meta.code.errorcharflagMetFlag metallicity (4)meta.code.errorchar