J/MNRAS/492/3408ivo://CDS.VizieR/J/MNRAS/492/3408doi:10.26093/cds/vizier.74923408CDSPrudil Z.Dekany I.Grebel E.K.Kunder A.2024-08-20T20:15:41Z2020-03-09T07:25:41ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyvariable-starsphotometryWe present a kinematical study of 314 RR Lyrae stars in the solar neighbourhood using the publicly available photometric, spectroscopic, and Gaia DR2 astrometric data to explore their distribution in the Milky Way. We report an overdensity of 22 RR Lyrae stars in the solar neighbourhood at a pericentre distance of between 5 and 9kpc from the Galactic Centre. Their orbital parameters and their chemistry indicate that these 22 variables share the kinematics and the [Fe/H] values of the Galactic disc, with an average metallicity and tangential velocity of [Fe/H]=-0.60dex and v_theta_=241km/s, respectively. From the distribution of the Galactocentric spherical velocity components, we find that these 22 disc-like RR Lyrae variables are not consistent with the Gaia Sausage (Gaia-Enceladus), unlike almost half of the local RR Lyrae stars. Chemical information from the literature shows that the majority of the selected pericentre-peak RR Lyrae variables are alpha-poor, a property shared by typically much younger stars in the thin disc. Using the available photometry, we rule out a possible misclassification with the known classical and anomalous Cepheids. The similar kinematic, chemical, and pulsation properties of these disc RR Lyrae stars suggest they share a common origin. In contrast, we find that the RR Lyrae stars associated with the Gaia- Enceladus based on their kinematics and chemical composition show a considerable metallicity spread in the old population (approximately 1dex).2020MNRAS.492.3408Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/492/3408CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)III/176 : RR Lyrae Metallicities (Layden 1994)J/AJ/108/1016 : Kinematics of local RR lyrae stars. I. (Layden 1994)J/MNRAS/435/3206 : Properties of field RR Lyrae variables (Dambis+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/492/3408https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/492/3408http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/492/3408https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/492/3408https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/492/3408http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/492/3408GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/492/3408/rrdisk (Galactic disc RR Lyrae stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3408/rrdisk?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3408/rrdisk?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3408/rrdisk?GETtext/xml+votable180.050000true12.395196127.02211610.0055555555555555566/110 1294 1663 2173 2238 2254 2629 4152 4165 4219 4286 4338 4479 4762 4833 4942 5182 5708 6301 6469 6537 6567 6744 7174 7518 7847 8466 8512 8612 8614 8896 9027 9095 9138 9172 9429 9438 9509 9635 9769 9938 10169 10334 10362 10382 10415 10524 10541 10569 10584 10638 10661 10792 10797 10802 10862 10898 10985 11098 11492 11961 12463 12512 12536 12696 12743 12773 12918 13066 13171 13205 13588 13647 13680 13905 14373 14504 14857 14874 14918 14939 14994 14996 15043 15120 15220 15281 16018 16022 16126-16127 16308 16342 16553 16602 16849 16867 16923 17158 17328 17745 18080 18177 18502 18536 18578 18633 18964 19104 19110 19169 19449 19956 20020 20097 20275 20303 20497 20541 20998 21127 21146 21182 21533 21878 21961 22111 22338 22571 22842 23271 24772 24866 25199 25491 25611 25768 25799 25807 25866 25953 26065 26079 26131 26170 26281 26288 26435 26487 26515 26733 26756 26894 26981 27012 27125 27361 27474 27824 27833 27915 27998 28030 28143 28256 28383 28469 28582 28674 28701 29009 30019 30055 30868 30923 30957 31054 31335 31390 31415 31648 31743 31787 31866 31884 32254 32257 32282 32354 32636 32663 32822 32833 32994 33051 33117 33121 33197 33432 33465 33467 33553 33745 33996 34229 34236 34240 34537 35418 35423 35611 35724 35768 35852 35921 36048 36363 36605 36704 36781 36939 37095 37544 37911 37952 38087 38233 38304 38809 38942 39152 40553 40651 40722 40767-40768 40806 40882 40911 40988 40998 41022 41064 41081 41174 41191 41200 41217 41219 41227 41231 41248 41260 41283 41285 41318 41510 41991 42053 42260 43491 43794 43888 43977 44242 44312 44498 44559 44640 44914 44991 45062 45086 45152 45164 45241 45324 45337 45676 45741 45765 45796 45963 45992 46069 46130 46204 46246 46327 46373 46641 46650 46755 47273 47327 47467-47468 47527 47618 47674 47776 47821 47856 47959 48113 48131 48137 48228 48290 48911 49086 491023.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/492/3408?format=asciidefaultJ/MNRAS/492/3408/rrdiskGalactic disc RR Lyrae starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGCVS variable star designationmeta.id;phys.atmol.configurationcharn_Name[+*] Note on Name (1)meta.notecharPeriodPulsation perioddtime.perioddoubleVmagApparent magnitude in Vmagphot.mag;em.opt.Vfloate_VmagUncertainty on apparent magnitude in Vmagstat.error;phot.mag;em.opt.VfloatAmpVAmplitude in V bandmagsrc.var.amplitudedoubleR21Fourier amplitude ratio R21src.var.amplitude;arith.ratiofloate_R21Uncertainty on Fourier amplitude ratio R21stat.errorfloatphi21Fourier phase parameter phi21stat.Fourierfloate_phi21Uncertainty on Fourier phase parameter phi21stat.errorfloatR31Fourier amplitude ratio R31src.var.amplitude;arith.ratiofloate_R31Uncertainty on Fourier amplitude ratio R31stat.errorfloatphi31Fourier phase parameter phi31stat.Fourierfloate_phi31Uncertainty on Fourier phase parameter phi31stat.errorfloat[Fe/H]Metallicityphys.abund.Zfloat[Ca/Fe]? Calcium abundancephys.abundfloatnullablevRGalactocentric radial velocitykm/sspect.dopplerVeloc;pos.galactocentricfloate_vRUncertainty on Galactocentric radial velocitykm/sstat.errorfloatvTGalactocentric tangential velocitykm/sphys.veloc.transverse;pos.galactocentricfloate_vTUncertainty on Galactocentric tangential velocitykm/sstat.errorfloatvZGalactocentric vertical velocitykm/sphys.veloc;pos.galactocentricfloate_vZUncertainty on Galactocentric vertical velocitykm/sstat.errorfloatrperPericentric distancekpcpos.distancefloate_rperUncertainty on pericentric distancekpcstat.errorfloatzmaxMaximum height from the Galactic planekpcpos.cartesian.z;pos.galacticfloate_zmaxUncertainty on Maximum height from the Galactic planekpcstat.errorfloateEccentricitysrc.orbital.eccentricityfloate_eUncertainty on eccentricitystat.errorfloatrapoApocentric distancekpcpos.distancefloate_rapoUncertainty on apocentric distancekpcstat.errorfloat_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