J/ApJ/898/L7ivo://CDS.VizieR/J/ApJ/898/L7doi:10.26093/cds/vizier.18989007CDSMarconi M.De Somma G.Ripepi V.Molinaro R.Musella I.Leccia S.,Moretti M.I.2022-09-30T21:11:02Z2021-12-30T08:08:33ZCDS support team

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

cds-question@unistra.frvariable-starsstellar-massesvisible-astronomytrigonometric-parallaxphotometryOn the basis of recently computed nonlinear convective pulsation models of Galactic Cepheids, spanning wide ranges of input stellar parameters, we derive theoretical mass-dependent Period-Wesenheit relations in the Gaia bands, namely, G, G_BP_, and G_BR_, that are found to be almost independent of the assumed efficiency of superadiabatic convection. The application to a selected subsample of the Gaia Data Release 2 Galactic Cepheids database allows us to derive mass-dependent estimates of their individual distances. By imposing their match with the astrometric values inferred from Gaia, we are able to evaluate the individual mass of each pulsator. The inferred mass distribution is peaked around 5.6M_{sun}_ and 5.4M_{sun}_ for the F and FO pulsators, respectively. If the estimated Gaia parallax offset <{Delta}{omega}>=0.046mas is applied to Gaia parallaxes before imposing their coincidence with the theoretical ones, the inferred mass distribution is found to shift toward lower masses, namely, ~5.2M_{sun}_ and 5.1M_{sun}_ for the F and FO pulsators, respectively. The comparison with independent evaluations of the stellar masses, for a subset of binary Cepheids in our sample, seems to support the predictive capability of the current theoretical scenario. By forcing the coincidence of our mass determinations with these literature values we derive an independent estimate of the mean offset to be applied to Gaia DR2 parallaxes, <{Delta}{omega}>=0.053+/-0.029mas, slightly higher but in agreement within the errors with the Riess+ 2018ApJ...861..126R value.2020ApJ...898L...7Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/L7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/142/87 : Velocities and light curves of V350 Sgr (Evans+, 2011)J/ApJ/730/119 : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)J/ApJ/813/29 : Classical and type II Cepheids IR excesses (Schmidt, 2015)J/A+A/622/A60 : Gaia DR2 misclassified RR Lyrae list (Clementini+, 2019)J/A+A/623/A117 : Gal. Cepheids & RR Lyrae multiplicity. II (Kervella+, 2019)J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)J/A+A/625/A14 : Reclassification of Cepheids in the Gaia DR2 (Ripepi+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/L7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/L7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/L7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/L7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/L7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/L7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/898/L7/table2 (The individual masses estimated from the theoretical period-Wesenheit (PWM) relations combined with Gaia DR2 parallaxes, for the fundamental (F) and first overtone (FO)-mode Galactic Classical Cepheid in the selected sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/898/L7/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/898/L7/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/898/L7/table2?GETtext/xml+votable180.050000true312.867659428.25050470.0055555555555555566/1239 1426 1920 1985 3000 3005 3033 3045 3047 3049 3052 3255 3261 3309 3342 3362 3600 3632 3641 3731 12971 12987 13166 13201 13288 13309-13310 13931 13933 13961 13990 14009 14047 14238-14239 14262 14265 14271 14283 14291 14314 14323-14324 14404 14424 14601-14602 14625 14637 14709 14718 14770 15360 15379 15388 15392 15396 15638 15660 21514 21648 24146 24226 28808 28819 28831 28893 28991 29032 29081 29110 29468 29665 29772 29875 30321 30333 30609 30641 30692 32074 37203 37235 37273 37332 37334 37340 37357 37363-37364 37674 37723 37745 37757 37829 37856 37888 37903 37923 37926 37928-37929 37931 37938 38022-38024 38026 38627 39125 39217 39232 39244 39357 39374 39410 39886 41375 41383 41385 41461 41556 41599 41605 41698 41721-41722 41761-41762 41794 41813 41862 42153 42156 42378 42820 43013 43022 43028 43044 43047 43056-43057 430601.9867573869263685e-19 4.621782916333392e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/898/L7?format=asciiOpticaldefaultJ/ApJ/898/L7/table2The individual masses estimated from the theoretical period-Wesenheit (PWM) relations combined with Gaia DR2 parallaxes, for the fundamental (F) and first overtone (FO)-mode Galactic Classical Cepheid in the selected samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR2 source identifiermeta.id;meta.mainModePulsation mode ("F" (114 occurrences) or "FO")src.classcharPer[1.1/41.5] Pulsation perioddtime.perioddoubleGmag[4.2/12.3] Apparent Gaia G band magnitudemagphot.mag;em.optfloatBPmag[4.7/13.4] Apparent Gaia Blue passband magnitudemagphot.mag;em.opt.BfloatRPmag[3.7/11.3] Apparent Gaia Red passband magnitudemagphot.mag;em.opt.Rfloatplx[0.25/3.44] Parallaxmaspos.parallax.trigfloate_plx[0.02/0.21] Uncertainty in plxmasstat.error;pos.parallaxfloatMass[2.3/12.8] MasssolMassphys.massfloate_Mass[0.3/2.0] Uncertainty in MasssolMassstat.error;phys.massfloatMc[1.7/11.8] Corrected masssolMassphys.massfloate_Mc[0.3/1.6] Uncertainty in McsolMassstat.errorfloatSimbadSimbad 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.main