J/A+A/566/A43ivo://CDS.VizieR/J/A+A/566/A43doi:10.26093/cds/vizier.35660043CDSKim D.-W.Protopapas P.Bailer-Jones C.A.L.Byun Y.-I.Chang S.-W.,Marquette J.-B.Shin M.-S.2017-12-22T05:33:21Z2014-06-05T09:12:53ZCDS support team

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

cds-question@unistra.frmagellanic-cloudssurveysvariable-starsccd-photometryinfrared-astronomyvisible-astronomybroad-band-photometryThe EPOCH (EROS-2 periodic variable star classification using machine learning) project aims to detect periodic variable stars in the EROS-2 light curve database. In order to classify these variables, we first build a training set by compiling known variables in the Large Magellanic Could area from the OGLE and MACHO surveys. We crossmatch these variables with the EROS-2 sources and extract 22 variability features from 28,392 light curves of the corresponding EROS-2 sources. We then use Random Forests to classify the EROS-2 sources in the training set. We design the model to separate not only Delta Scuti stars, RR Lyraes, Cepheids, eclipsing binaries and long-period variables, the "superclasses", but also their subclasses, such as RRab, RRc, RRd and RRe for RR Lyraes, and similarly for the other variable types. We apply the trained model to the entire EROS-2 LMC database containing about 29 million sources and find 117,234 periodic variable candidates. Out of these 117,234 periodic variables, 55,285 have not been discovered by either OGLE or MACHO variability studies. This set comprises 1906 Delta Scuti stars, 6,607 RR Lyraes, 638 Cepheids, 178 Type II Cepheids, 34,562 eclipsing binaries and 11,394 long-period variables.2014A&A...566A..43Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/566/A43CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001)J/AcA/49/223 : BVI photometry of OGLE LMC Cepheids (Udalski+, 1999)J/AcA/50/307 : OGLE LMC BVI photometry (Udalski+, 2000)J/AcA/53/93 : OGLE RR Lyrae in LMC (Soszynski+, 2003)J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)J/AcA/58/293 : Type-II and anomalous Cepheids in LMC (Soszynski+, 2008)J/AcA/59/1 : VI light curves of LMC RR Lyrae stars (Soszynski+, 2009)J/AcA/59/239 : VI light curves of LMC long-period variables (Soszynski+, 2009)J/AcA/59/335 : VI light curves of LMC R CBr stars (Soszynski+, 2009)J/AcA/60/1 : VI light curves of LMC delta Scuti stars (Poleski+, 2010)J/AcA/60/179 : VI light curves of LMC double periodic variables (Poleski+ 2010)J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Szymanski+, 2011)J/A+A/303/137 : EROS Variables: Cepheids in the bar of LMC (Beaulieu+ 1995)J/A+A/377/945 : Variability and spectra of LMC giants (Cioni+ 2001)J/A+A/495/249 : EROS-2 beat Cepheids in Magellanic Clouds (Marquette+, 2009)J/A+A/536/A60 : EROS-2 Long Period Variables in LMC (Spano+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/566/A43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/566/A43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/566/A43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/566/A43https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/566/A43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/566/A43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/566/A43/table2 (EROS-2 periodic variable stars in LMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/566/A43/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/566/A43/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/566/A43/table2?GETtext/xml+votable180.050000true80.23259-69.130930.0055555555555555564/2065 2068-2069 5/8259 8265 8268-8269 8280-8281 8284 8448 9352 9354 9376 9378 9384 9386 6/33028-33029 33031 33035 33056-33057 33080-33081 33084-33085 33128-33129 33132-33133 33140-33141 33144 33800 33802 37386 37412 37414 37420 37422 37508 37510 37516 37518 37540 38912-38913https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/566/A43?format=asciiOpticalInfrareddefaultJ/A+A/566/A43/table2EROS-2 periodic variable stars in LMCOGLEIDOGLE ID, OGLE-LMC-AAAAA-NNN (2)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEROS-IDEROS ID, lmNNNNaNNNNN (EROS2-star lmNNN-Na-NNNNN in Simbad)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedB-R[-2.2/4.5] EROS B-R colour indexmagphot.color;em.opt.B;em.opt.RfloatBmag[12.8/21.8] EROS B magnitudemagphot.mag;em.opt.BfloatPer[0.05/4806] Perioddtime.perioddoubleS/N[6/144] Signal-to-noise ratio of the periodmeta.notefloatProb[0.1/1] Estimated Vclass probabilitystat.probabilityfloatVclassVariable class determined by this workmeta.code;src.varcharOclassOGLE variable superclass (1)meta.code;src.varcharO.ClassOGLE variable subclass (2)meta.code;src.varcharMACHOIDMACHO ID, NN.NNNN.NNN (3)meta.idcharMclassMACHO variable class (1)meta.code;src.varcharSimbadSimbad column added by the CDSmeta.ref.urlchar