J/A+A/713/A221ivo://CDS.VizieR/J/A+A/713/A221CDSGarofalo A.Muraveva T.Monti L.Clementini G.Cusano F.,Valentini M.L.2026-09-21T08:51:42Z2026-09-21T09:45:59ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsvisible-astronomyRR Lyrae stars are essential tracers of old stellar populations and distance indicators across the Milky Way (MW) and nearby galaxies. However, their use as standard candles is limited by uncertainties in extinction, particularly in the optical regime probed by the ESA mission Gaia. In Gaia Data Release 3 (DR3), individual absorption values (A_G) were provided for fundamental-mode RR Lyrae stars (RRab) based on an empirical period-amplitude-color (PAC) relation calibrated on a relatively small sample and on passband transformations. We aim to recalibrate extinction relations for RRab stars and, for the first time, establish analogous relations for first-overtone RR Lyrae stars (RRc) using Gaia DR3 photometry and pulsation parameters to provide intrinsic colors and interstellar absorption estimates. We used Gaia DR3 mean magnitudes and pulsation properties of RRab and RRc stars from an all-sky reference sample to recalibrate PAC(Z) relations in the Gaia passbands. Intrinsic colors (G-G_RP_)0 and (G_BP_-G_RP_)0 were derived through sequential feature selection combined with linear regression and bootstrap resampling, ensuring statistically consistent estimates of color excess and A_G_. We recalibrated PACZ relations for RRab stars and derived, for the first time, PAC relations for RRc stars in the Gaia bands. The new relations reproduce intrinsic colors with residual scatters of ~0.03-0.04mag and provide A_G_ estimates across both pulsation types. Tests on RR Lyrae stars in the MW field, globular clusters, and dwarf galaxy companions show consistent A_G_ values, with the PAC(Z) relations based on (G_BP_-G_RP_) appearing more reliable than those using (G-G_RP_). The new relations provide consistent extinction estimates for both RRab and RRc stars, improving on the DR3 implementation and offering a valuable tool for Galactic studies and cosmic-distance scale work in view of Gaia DR4.2026A&A...713A.221Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A221CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A221https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A221http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A221https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A221https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A221http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A221GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/713/A221/tablea1 (Mean values and standard deviations of color excesses and extinction for Galactic GCs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A221/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A221/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A221/tablea1?GETtext/xml+votable180.050000true117.583-18.305798890.005555555555555556Cone search capability for table J/A+A/713/A221/tablea4 (Parameters for the 38 RRc stars in the M21 reference sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A221/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A221/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A221/tablea4?GETtext/xml+votable180.050000true119.74572.7880.005555555555555556Cone search capability for table J/A+A/713/A221/table5 (Parameters for the 373 RRab stars in the M21 reference sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A221/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A221/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A221/table5?GETtext/xml+votable180.050000true292.1837917-30.35563890.0055555555555555566/1294 1663 4037 4152 4165 4194 4762 5708 6389 6391 6469 7518 7847 8064 8466 8512 8896 8994 9027 9095 9138 9172 9363 9429 9436 9509 9635 9666 9769 9938 10008 10321 10328 10334 10336 10362 10382 10406 10411 10524 10541 10569 10584 10602 10638 10661 10792 10797 10802 10862 10898 10985 11098 11123 11492 11961 12310 12405 12425 12454 12463 12512 12531 12696 12918 13066 13171 13205 13647 13680 13905 14373 14489 14504 14857 14874 14918 14996 15043 15281 15714 16018 16022 16126 16308 16342 16646-16647 16656 16660 16699 16832 16849 17121 17158 17207 17468 17704 17968 18177 18229 18775 19091 19169 20001 20020 20267 20275 20303 20328 20330 20332 20377 20418 20497 20541 20681 20848 20998 21017 21081 21111 21127 21146 21182 21209 21268 21270 21286 21384 21473 21519 21565 21792 21832 21849 21856 21878 21883 22338 22345 22537 22842 23591 24578 24584 24667 24772 24799 24843 24866 24876 24985 25072 25081 25199 25297 25308 25485 25491 25493 25611 25768 25799 25807 25831 25844 25873 26022 26113 26165 26243 26261 26270 26288 26291 26311 26354 26362 26435 26487 26515 26534 27173 27186 27316 27361 27663 27981 27983 27986 27998 28030 28067 28143 28155 28538 28768-28769 28778 28813 28815 28867 28889 28962 28970 28973-28974 29184 29187 29195 29216 29222 29231 29318 29327 29377 29870 30019 30048 30055 30133 30378 30539 30550 30769 31043 31054 31066 31074 31077 31089 31095 31173 31203 31216 31321 31398 31417 31554 31568 31648 31743 31787 31884 32257 32354 32436 32663 32790 32822 32833 32983 32993-32994 33051 33097 33117 33121 33127 33330 33342 33432 33465 33467 33543 33553 33635 33649 33663 33745 33749 33766 33922 33996 34229 34236 34242 34436 34537 34558 34944 35151 35203 35399 35418 35423 35485 35611 35623 35683 35686 35724 35768 35809 35852 35921 36048 36198 36245 36363 36652 36939 37076 37095 37235 37242 37249 37261 37294 37302 37306 37330 37539 37544 37550 37902 37911 37934 37947 37952 37994 38087 38213 38233 38237 38247 38259 38304 38456 38465 38511 38762 38809 38898 39313 39316 39403 39642 40060 40203 40227 40303 40506 40552-40553 40564 40581 40592 40598 40626 40651 40722 40767-40769 40882 40962 40988 40998 41011 41022 41064 41079 41081 41174 41183 41191 41200 41219 41248 41253 41257 41260 41283 41285 41299 41304 41335 41345 41351 41438 41456 41502 41510 41522 41544 41732 41847 41991 42018 42024 42030-42031 42041 42046 42056 42062-42063 42083 42120 42128 42245 42278 42314 42672 42700 42739 42749 42761 42841 42865 42942 42955 42990 43049 43078 43098 43193 43227 43558 43564 43654 43666 43681 43794 43938 44086 44312 44384 44427 44498 44510 45062 45086 45152 45164 45242 45324 45337 45400 45584 45626 45664 45676 45718 45741 45892 45963 46069 46082 46130 46204 46246 46293 46327 46373 46454 46641 46650 46655 46755 46786 47162 47239 47245 47261 47618 47620 47777 47825 47866 47868 47903 47935 47971 48131 48137 48315 48398 48434 48698 48916 48952 49086 49102https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A221?format=asciiOpticaldefaultJ/A+A/713/A221/tablea1Mean values and standard deviations of color excesses and extinction for Galactic GCsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 source_idmeta.id;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlchar[Fe/H]Metallicityphys.abund.ZdoubleRA_ICRSRight ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainPPerioddtime.perioddoubleGmagG magnitudemagphot.mag;em.optdoubleBPmagBP magnitudemagphot.mag;em.opt.BdoubleRPmagRP magnitudemagphot.mag;em.opt.RdoubleAmpGAmplitude in G bandmagsrc.var.amplitudedoubleAmpBPAmplitude in BP bandmagsrc.var.amplitudedoubleAmpRPAmplitude in RP bandmagsrc.var.amplitudedoubler21GFourier parameter A2/A1radphot.mag;arith.ratiodoubler31GFourier parameter A3/A1radphot.mag;arith.ratiodoublephi21G{phi}_21_ Fourier coefficientradstat.fit.paramdoublephi31G{phi}_31_ Fourier coefficientradstat.fit.paramdouble(G-RP)0Deredenned G-RP colourmagphot.color;em.opt;em.optdouble(BP-RP)0Deredenned BP-RP colourmagphot.color;em.opt;em.optdoubleJ/A+A/713/A221/tablea4Parameters for the 38 RRc stars in the M21 reference sampleSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 source_idmeta.id;meta.mainRA_ICRSRight ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.main[Fe/H]Metallicityphys.abund.ZdoublePPerioddtime.periodfloatGmagG magnitudemagphot.mag;em.optdoubleBPmagBP magnitudemagphot.mag;em.opt.BdoubleRPmagRP magnitudemagphot.mag;em.opt.RdoubleAmpGAmplitude in G bandmagsrc.var.amplitudefloatAmpBPAmplitude in BP bandmagsrc.var.amplitudefloatAmpRPAmplitude in RP bandmagsrc.var.amplitudefloatr21GFourier parameter A2/A1radphot.mag;arith.ratiofloatr31GFourier parameter A3/A1radphot.mag;arith.ratiofloatphi21G{phi}_21_ Fourier coefficientradstat.fit.paramfloatphi31G{phi}_31_ Fourier coefficientradstat.fit.paramfloat(G-RP)0Deredenned G-RP colourmagphot.color;em.opt;em.optfloat(BP-RP)0Deredenned BP-RP colourmagphot.color;em.opt;em.optfloatJ/A+A/713/A221/table5Parameters for the 373 RRab stars in the M21 reference samplee_AG(GBP-GRP)? Error on A_G_ from E(G_BP_-G_RP_)magstat.errorfloatnullableN2? Number of stars used for E(G_BP_-G_RP_)meta.numberintnullableAGDR3? A_G_ extinction value from Gaia DR3magphys.absorptionfloatnullablee_AGDR3? Error on A_G_ DR3magstat.errorfloatnullableN3? Number of stars used for A_G DR3meta.numberintnullableSimbadNameSimbad column added by the CDSmeta.idcharnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSystemGlobular Cluster system namemeta.id;meta.maincharTypeRR Lyrae type (ab,c or ab+c)meta.notecharE(G-GRP)? Mean E(G-G_RP_) color excessmagphot.color.excessfloatnullablee_E(G-GRP)? Error on E(G-G_RP_)magstat.errorfloatnullableAG(G-GRP)? A_G extinction value from E(G-G_RP_)magphys.absorptionfloatnullablee_AG(G-GRP)? Error on A_G_ from E(G-G_RP_)magstat.errorfloatnullableN1? Number of stars used for E(G-G_RP_)meta.numberintnullableE(GBP-GRP)? Mean E(G_BP-G_RP) color excessmagphot.color.excessfloatnullablee_E(GBP-GRP)? Error on E(G_BP-G_RP)magstat.errorfloatnullableAG(GBP-GRP)? A_G_ extinction value from E(G_BP_-G_RP_)magphys.absorptionfloatnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main