J/MNRAS/452/4283ivo://CDS.VizieR/J/MNRAS/452/4283doi:10.26093/cds/vizier.74524283CDSMolnar L.Szabo R.Moskalik P.A.Nemec J.M.Guggenberger E.Smolec R.,Poleski R.Plachy E.Kolenberg K.Kollath Z.2024-08-15T20:14:40Z2016-06-22T10:08:16ZCDS support team

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

cds-question@unistra.frvariable-starsA detailed analysis is presented of 33 RR Lyrae stars in Pisces observed with the Kepler space telescope over the 8.9-d long K2 Two-Wheel Concept Engineering Test. The sample includes not only fundamental-mode and first-overtone (RRab and RRc) stars but the first two double-mode (RRd) stars that Kepler detected and the only modulated first-overtone star ever observed from space so far. The precision of the extracted K2 light curves made it possible to detect low-amplitude additional modes in all subtypes. All RRd and non-modulated RRc stars show the additional mode at P_X_/P_1_~0.61 that was detected in previous space-based photometric measurements. A periodicity longer than the fundamental mode was tentatively identified in one RRab star that might belong to a gravity mode. We determined the photometric [Fe/H] values for all fundamental-mode stars and provide the preliminary results of our efforts to fit the double-mode stars with non-linear hydrodynamic pulsation models. The results from this short test run indicate that the K2 mission will be, and has started to be, an ideal tool to expand our knowledge about RR Lyrae stars. As a by-product of the target search and analysis, we identified 165 bona fide double-mode RR Lyrae stars from the Catalina Sky Survey observations throughout the sky, 130 of which are new discoveries.2015MNRAS.452.4283Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/452/4283CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/765/154 : RR Lyrae stars in the Catalina Sky Survey (Drake+, 2013)J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)J/MNRAS/441/1230 : RRLyr stars in the Catalins Sky Survey (CS2) (Abbas+, 2014)J/MNRAS/446/2251 : Southern Catalina Survey type-ab RR Lyrae (Torrealba+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/452/4283https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/452/4283http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/452/4283https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/452/4283https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/452/4283http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/452/4283GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/452/4283/table3 (Double-mode and first-overtone RR Lyrae stars observed during the Two-Wheel Concept Engineering Test run of the K2 mission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/4283/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/4283/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/4283/table3?GETtext/xml+votable180.050000true359.180153.022110.005555555555555556Cone search capability for table J/MNRAS/452/4283/table5 (Fundamental-mode RR Lyrae stars observed during the Two-Wheel Concept Engineering Test run of the K2 mission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/4283/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/4283/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/4283/table5?GETtext/xml+votable180.050000true0.83753.398330.005555555555555556Cone search capability for table J/MNRAS/452/4283/tablea (table of the confirmed double-mode RR Lyrae stars in the Catalina Surveys Periodic Variable Stars Catalog (Tables A1 and A2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/4283/tablea?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/4283/tablea?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/4283/tablea?GETtext/xml+votable180.050000true3.58683313.203890.0055555555555555566/437 644 2334 2609 4212 4638 4835 4859 4992 5024 5176 5178 5508 5510 5545 5573 5666 5668 6429 6484 6558 7048 8215 8217 8314 8341 8381 8391 8472 8532 8579 8624 8707 8717 8967 9080 9157 9163 9211 9293-9294 9408 9525 9547 9590 9618 9645 9686 9705 9776 9782 9814 9828 9991 10177 10767 12288-12289 12341 12345 12402-12403 12582 12655 12675 13432 13526 15017 15096 16805 17151 17262 17327 17333 17342 17346 17351 17371 17384-17385 17387 17404 17455 17837 17848 17892 18122 18469 18511 18580 18708 18719 18753 18760-18762 18775 18779 18781 18797 18803-18804 18808 18827 18875 19118 19233 19254 19355 19359 19467 19469-19470 19473-19474 19491 19494 19830 19879 19890 20142 20154 20389 22534 22549 22598 22654 23060 23297 25275 25504 25536 26048 26055 26254 26288 26317 26405 26836 26961 26975 26989 27113 27115 27157 27194 27405 27466 27491 27516 27728 27802 27806 28045 28086 28106 28161 28167 28232 28362 28386 28620 30876 30897 31337 31355 31451 31511 31523 31540 31607 31637 31706 32269 32404 32573 32655 32703 40402 40935 44503-44504 44516 44795 44797 45023 49012 49036 49054 49138 49144 49147https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/452/4283?format=asciidefaultJ/MNRAS/452/4283/table3Double-mode and first-overtone RR Lyrae stars observed during the Two-Wheel Concept Engineering Test run of the K2 missionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the light curvemeta.ref.urlcharEPICEPIC star numbermeta.id;meta.mainintn_EPICNote on EPIC (1)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainkepmagKepler magnitudemagphot.mag;em.optfloatn_kepmag[*] Note on kepmag (2)meta.notecharP1Period of the first overtonedtime.perioddoubleNameName of the starmeta.idcharP0? Period of fundamental modedtime.perioddoublenullablen_P0[a] a: Modulation periodmeta.notecharCSSID? CSS ID numbermeta.idnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/452/4283/table5Fundamental-mode RR Lyrae stars observed during the Two-Wheel Concept Engineering Test run of the K2 missionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMod[abc] RRab modulation status (1)meta.codecharFreqDisplay the frequency content in table2meta.ref.urlcharLCShow the light curvemeta.ref.urlcharEPICEPIC star numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainkepmagKepler magnitudemagphot.mag;em.optfloatPerPerioddtime.perioddoubleNameStar namemeta.idchar[Fe/H]Metallicity (average uncertainty is +/-0.1)stat.error;phys.abund.Z;stat.meanfloatCSSID? CSS identification numbermeta.idnullablePm? Blazhko perioddtime.periodfloatnullableNotesNotesmeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/452/4283/table1K2-E2 light-curve (for the 33 stars)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICEPIC identification numbermeta.id;meta.mainintBJDBarycentric Julian date (BDJ-2450000)dtime.epochdoublekepmagKepler magnitudemagphot.mag;em.optdoublee_kepmagrms uncertainty on Kepmagmagstat.error;phot.magdoubleJ/MNRAS/452/4283/table2Frequency content of the K2-E2 RR Lyrae stars (for the 33 stars)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICEPIC star numbermeta.id;meta.mainintFreqFrequencyd**-1em.freqdoubleAmpAmplitude in kepmag unitsrc.var.amplitudedoublePhasePhase (in rad/2{pi} unit)time.phasedoublee_Freqrms uncertainty on Freqd**-1stat.errordoublee_Amprms uncertainty on Ampstat.errordoublee_Phaserms uncertainty on Pjase (in rad/2{pi} unit)stat.error;time.phasedoubleIDIdentification of the frequency (1)em.freq;src.varcharJ/MNRAS/452/4283/tableatable of the confirmed double-mode RR Lyrae stars in the Catalina Surveys Periodic Variable Stars Catalog (Tables A1 and A2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCSSCSS name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainmagBrightnessmagphot.magfloatCSSIDCSS identification numbermeta.idONameOther IDmeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlcharP0Period of fundamental modedtime.perioddoublee_P0rms uncertainty on PerFMdstat.errordoubleAmp0Amplitude of fundamental modemagphot.magfloatP1Period of first overtonedtime.perioddoublee_P1rms uncertainty on PerO1dstat.errordoubleAmp1Amplitude of first overtonemagphot.magfloatP1/P0Period ratio, P1/P0time.perioddouble