J/A+A/620/A127ivo://CDS.VizieR/J/A+A/620/A127doi:10.26093/cds/vizier.36200127CDSMolnar L.Plachy E.Juhasz L.A.Rimoldini L.2023-12-21T15:38:43Z2018-12-07T09:19:13ZCDS support team

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

cds-question@unistra.frvariable-starsmorgan-keenan-classificationThe second data release of the Gaia mission (DR2) includes an advance catalogue of variable stars. The classifications of these stars are based on sparse photometry from the first 22 months of the mission. We set out to investigate the purity and completeness of the all-sky Gaia classification results with the help of the continuous light curves of the observed targets from the Kepler and K2 missions, focusing specifically on RR Lyrae and Cepheid pulsators, outside the Galactic bulge region. We cross-matched the Gaia identifications with the observations collected by the Kepler space telescope. We inspected the light curves visually, then calculated the relative Fourier coefficients and period ratios for the single- and double-mode K2 RR Lyrae stars to further classify them. We identified 1443 and 41 stars classified as RR Lyrae or Cepheid variables in Gaia DR2 in the targeted observations of the two missions and 263 more RR Lyre targets in the full-frame images (FFI) of the original mission. We provide the cross-match of these sources. We conclude that the RR Lyrae catalogue has a completeness between 70-78%, and provide a purity estimate of between 92-98% (targeted observations) with lower limits of 75% (FFI stars) and 51% (K2 worst-case scenario). The low number of Cepheids prevents us from drawing detailed conclusions, but the purity of the DR2 sample is estimated to be about 66%.2018A&A...620A.127Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/620/A127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/MNRAS/456/2260 : K2 Variability Catalogue II (Armstrong+, 2016)J/A+A/620/A128 : Gaia DR2 study of Herbig Ae/Be stars (Vioque+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/620/A127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/620/A127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/620/A127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/620/A127https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/620/A127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/620/A127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/620/A127/tablea1 (Kepler-Gaia DR2 RR Lyrae crossmatch (kepg2rrl.dat))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea1?GETtext/xml+votable180.050000true290.044377838.28755480.005555555555555556Cone search capability for table J/A+A/620/A127/tablea2 (Cross-match of RRc-type stars in the original Kepler observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea2?GETtext/xml+votable180.050000true291.209382840.24497990.005555555555555556Cone search capability for table J/A+A/620/A127/tablea3 (Stars with uncertain but likely classifications from the original Kepler observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea3?GETtext/xml+votable180.050000true290.670896638.84522850.005555555555555556Cone search capability for table J/A+A/620/A127/tablea4 (K2-Gaia DR2 RRab crossmatch (k2g2rrab.dat))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea4?GETtext/xml+votable180.050000true94.451878919.72038450.005555555555555556Cone search capability for table J/A+A/620/A127/tablea5 (K2-Gaia DR2 RRc crossmatch (k2g2rrc.dat))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea5?GETtext/xml+votable180.050000true173.4343361-5.10260350.005555555555555556Cone search capability for table J/A+A/620/A127/tablea6 (Cross-match of RRd-type stars in the K2 observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea6?GETtext/xml+votable180.050000true176.83407021.82394360.005555555555555556Cone search capability for table J/A+A/620/A127/tablea7 (Cepheid cross-match)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea7?GETtext/xml+votable180.050000true297.064433543.12691760.005555555555555556Cone search capability for table J/A+A/620/A127/tablea8 (Cross-match of stars that turned out not to be RR Lyrae stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea8?GETtext/xml+votable180.050000true166.92473440.43564450.005555555555555556Cone search capability for table J/A+A/620/A127/tablea9 (Cross-match of stars that turned out not to be Cepheid variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A127/tablea9?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A127/tablea9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A127/tablea9?GETtext/xml+votable180.050000true288.800564839.71399880.0055555555555555565/3683 3695 3704 3730 3732-3733 3739-3740 3777 3780 6406-6407 6424 6448 6452 6538 6543 6569 7233 7235 7249 7261 7298 7310 7332 7335 7344 11096 12007 12024 12026 6/261 270 274 276 281 284-285 289 295 301 307 314 319 328 335-336 339 341-343 346 349 354-355 363 366 369 375 381 388 391 400 403 409 437 448-449 451 454 463-464 467-468 470 473-474 1024-1025 1028 1030 1032-1033 1035-1036 1041 1045 1051 1055 1058 1065 4252-4253 4255 4286-4287 4297 4301 4314 4328 4333 4346-4347 4349 4351 4514 4521-4522 4613 4623-4624 4626 4628 4632 4634 4656-4657 4661-4662 4675 4677-4678 4684 4687 4691-4692 4695-4696 4700 4704-4705 4707-4708 4710 4712 4719-4720 4725-4728 4730-4731 4757 4800 4805 4816 4873 4876 4896 14575 14578-14579 14581-14582 14584-14586 14590-14591 14730-14731 14746 14750 14753-14757 14759-14762 14764-14766 14768 14770 14773-14774 14776-14778 14824-14826 14828 14830 14916 14918 14924-14925 14939 14941-14942 14945-14947 14950-14953 14955 14964 14966-14967 14970-14972 15040-15041 15044-15045 15057 15104 15107 15112-15113 15115 15118-15119 15128 15133 15136 15139-15141 15148-15149 15153-15158 15169 15171-15172 15232 17149 17151 17288-17289 17293-17295 17304 17306 17313 17315-17317 17321 17323 17326-17330 17333 17336 17352 17382 17389 17990 17998-17999 18009 18011 18014-18015 18017-18018 18021-18022 18024-18025 18029 18033 18036 18039-18041 18044 18117-18118 18121 18124 18129 18131-18133 18135-18136 18145 18151 18178 18182 18184 18186 18190 18218 18223 18225 18305 18307-18308 18310 18312 18314 18318 18330-18332 18334 18336 18354 18362 18433 18435-18436 18441 18444 18449 18451-18452 18459 18466 18474 18477 18480-18481 18484 18488-18489 18492-18493 18495 18499 18509 18511 18518-18519 18526-18527 18536 18538-18539 18549 18557 18561 18565-18566 18571 18573 18578-18580 18582 18586 18589 18610 18616 18621 18627 18630 18633 18635-18636 18640 18648 18652 18656 18660 18665 18668 18691-18692 18695 18699-18701 18707-18708 18712-18713 18715 18718 18724-18726 18734 18736 18738-18739 18741-18744 18746 18748 18750-18752 18754 18761-18763 18785 18795 18797-18798 18821 18832 18836 18880-18881 23470-23471 23482 23485-23486 23508 23511 23541 23975 23989 24002 24015 24026 24106 24108 24114-24115 24122 24197 24200 24205 24210 24222 24224 24226-24227 24229-24230 24233 24238 24241 24244-24245 24247-24250 24255 24266 24296 24325-24326 24339-24340 25421-25423 25425-25426 25428 25430-25431 25433-25434 25443-25446 25449 25451-25454 25456 25458-25460 25462-25466 25468 25470 25543 25549-25553 25555-25556 25558-25560 25562-25564 25566-25567 25584-25585 25588 25590-25591 25596 25602 25605-25607 25610-25611 25614-25616 25619 25633 25637 25641 25644 25646 25648 25653 25655 25659 25663 25672-25673 25676-25677 25683 25686 25692 25694 25701-25704 25706 25708-25709 25711-25713 25716 25718-25719 25721 25723 25725-25729 25741 25747-25749 25751-25753 25755-25757 25759 25771 25781 25799-25802 25805-25807 25813 25816-25818 25824 25896 26113 26115-26116 26124 26147-26148 26150-26151 26157-26158 26163 26165-26167 26170-26171 26208 26241 26243 26245 26247-26248 26252-26254 26257-26258 26261 26263-26265 26267-26268 26270-26271 26273-26274 26280-26281 26283 26288-26289 26291-26293 26295 26299-26300 26306-26307 26313-26314 26901 26958 26969 26975 26977 26979 26993-26994 27031 27094 27109 27125 27662 27683 27688 27779 28793 28836 28848 28850 28893 28929 28931 28946-28947 28949-28950 28952 28957 28959 28976 28979 28981 28984 29006-29007 29009-29012 29016 29018-29020 29022 29025 29027-29029 29032-29034 29036-29037 29040 29042 29051 29089 29104 29106 29110 29188 29198 29203 29208 29211-29212 29216 29218-29220 29222 29224 29231 29238-29239 29245-29248 29256-29257 29261 29282 29287-29288 29290-29291 29294 29307 29312 29315-29317 29319 29333-29335 29352 29380 29382 29384 30728 30730-30731 30752 30754 42846-42847 42865 42869-42870 42876 42939 42942 42955 42964 42978 42989-42990 43002 44311 44356-44358 44364-44365 44376 44378 44388 44390 44396 44400 44406-44407 44412 44719 44722-44723 44726 44731-44732 44769-44771 44777 44780 48015 48024 48026-48027 48037 48043 48045-48049 48054-48056 48059 48061 48072 48074 48089 48091-48092 48095 48108 48120-48121 48502 48510-48511 48597 48607 488101.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/620/A127?format=asciiOpticaldefaultJ/A+A/620/A127/tablea1Kepler-Gaia DR2 RR Lyrae crossmatch (kepg2rrl.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharKICKepler Input Catalog identifiermeta.idintKpmag? Flux-calibrated Kepler magnitudemagphot.mag;em.optfloatnullableType[FFI target] Kepler data type (target or FFI)meta.codecharKpClassKepler class (only in tablea3.dat)meta.code;src.varcharJ/A+A/620/A127/tablea2Cross-match of RRc-type stars in the original Kepler observationsSourceGaia DR2 source identifier (source_id)meta.id;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharKICKepler Input Catalog identifiermeta.idintKpmag? Flux-calibrated Kepler magnitudemagphot.mag;em.optfloatnullableType[FFI target] Kepler data type (target or FFI)meta.notecharKpClassKepler class (only in tablea3.dat)meta.code;src.varcharJ/A+A/620/A127/tablea3Stars with uncertain but likely classifications from the original Kepler observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharKICKepler Input Catalog identifiermeta.idintKpmag? Flux-calibrated Kepler magnitudemagphot.mag;em.optfloatnullableType[FFI target] Kepler data type (target or FFI)meta.notecharKpClassKepler class (only in tablea3.dat)meta.code;src.varcharJ/A+A/620/A127/tablea4K2-Gaia DR2 RRab crossmatch (k2g2rrab.dat)PerPulsation perioddtime.perioddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitude (median_mag_g_fov)magphot.mag;em.optfloatVClassGaia DR2 best variable class (best_class_name)meta.code;src.varcharEPICK2 Ecliptic Plane Input Catalog identifiermeta.idcharK2CObserving K2 campaignmeta.id;obscharKpmagFlux-calibrated Kepler magnitudemagphot.mag;em.optfloatJ/A+A/620/A127/tablea5K2-Gaia DR2 RRc crossmatch (k2g2rrc.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitude (median_mag_g_fov)magphot.mag;em.optfloatVClassGaia DR2 best variable class (best_class_name)meta.code;src.varcharEPICK2 Ecliptic Plane Input Catalog identifiermeta.idcharK2CObserving K2 campaignmeta.id;obscharKpmagFlux-calibrated Kepler magnitudemagphot.mag;em.optfloatPerPulsation perioddtime.perioddoubleJ/A+A/620/A127/tablea6Cross-match of RRd-type stars in the K2 observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharEPICK2 Ecliptic Plane Input Catalog identifiermeta.idlongK2CObserving K2 campaignmeta.id;obsintKpmagKepler magnitudemagphot.mag;em.optfloatP0Fundamental pulsation perioddtime.perioddoubleP1First overtone pulsation perioddtime.perioddoubleJ/A+A/620/A127/tablea7Cepheid cross-matchrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharKIC/EPICK2 Ecliptic Plane Input Catalog identifier or Kepler Input Catalog identifiermeta.idlongCampaignCampaignmeta.notecharIDOther namemeta.idcharNote[ABC] Note (1)meta.notecharJ/A+A/620/A127/tablea8Cross-match of stars that turned out not to be RR Lyrae starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharEPICK2 Ecliptic Plane Input Catalog identifiermeta.idlongK2CObserving K2 campaignmeta.id;obscharComComment Alternative identifications and/or likely variability class, if possiblemeta.code.class;src.varcharJ/A+A/620/A127/tablea9Cross-match of stars that turned out not to be Cepheid variablesGmagGaia DR2 median G-band magnitudemagphot.mag;em.optfloatVClassGaia DR2 best variable classmeta.code;src.varcharEPICK2 Ecliptic Plane Input Catalog identifiermeta.idlongK2CObserving K2 campaignmeta.id;obscharComComment Alternative identifications and/or likely variability class, if possiblemeta.code.class;src.varcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at Ep=2015.5degpos.eq.dec;meta.main