J/AcA/52/369ivo://CDS.VizieR/J/AcA/52/369doi:10.26093/cds/vizier.120520369CDSSoszynski I.Udalski A.Szymanski M.Kubiak M.Pietrzynski G.,Wozniak P.Zebrun K.Szewczyk O.Wyrzykowski L.2025-09-25T20:14:55Z2023-04-04T14:12:59ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsphotometryvisible-astronomyWe present the catalog of RR Lyrae stars from 2.4 square degrees of central parts of the Small Magellanic Cloud (SMC). The photometric data were collected during four years of the OGLE-II microlensing survey. Photometry of each star was obtained using the Difference Image Analysis (DIA) method. The catalog contains 571 objects, including 458 RRab, 56 RRc variables, and 57 double mode RR Lyr stars (RRd). Additionally we attach a list of variables with periods between 0.18-0.26 days, which are probably delta Sct stars. Period, BVI photometry, astrometry, amplitude, and parameters of the Fourier decomposition of the I-band light curve are provided for each object. We also present the Petersen diagram for double mode pulsators. We found that the SMC RR Lyr stars are fairly uniformly distributed over the studied area, with no clear correlation to any location. The most preferred periods for RRab and RRc stars are 0.589 and 0.357 days, respectively. We noticed significant excess of stars with periods of about 0.29 days, which might be second-overtone RR Lyr stars (RRe). The mean extinction free magnitudes derived for RRab stars are 18.97, 19.45 and 19.73 mag for the I, V and B-band, respectively. All presented data, including individual BVI observations, are available from the OGLE Internet archive.2002AcA....52..369Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/52/369CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toftp://sirius.astrouw.edu.pl/ogle/ogle2/var_stars/smc/rrlyr : OGLE Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/52/369https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/52/369http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/52/369https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/52/369https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/52/369http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/52/369GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AcA/52/369/table2 (ab-type RR Lyrae stars from the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table2?GETtext/xml+votable180.050000true9.282875-73.93719440.005555555555555556Cone search capability for table J/AcA/52/369/table3 (c-type RR Lyrae stars from the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table3?GETtext/xml+votable180.050000true9.784625-73.90744440.005555555555555556Cone search capability for table J/AcA/52/369/table4 (d-type RR Lyrae stars from the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table4?GETtext/xml+votable180.050000true9.1609167-73.67616670.005555555555555556Cone search capability for table J/AcA/52/369/table5 (Other variable stars from the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table5?GETtext/xml+votable180.050000true10.4902083-73.02219440.005555555555555556Cone search capability for table J/AcA/52/369/table6 (Cross-identification of stars detected in the overlapping regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table6?GETtext/xml+votable180.050000true10.6143333-73.61530560.005555555555555556Cone search capability for table J/AcA/52/369/table9 (RR Lyr stars close to the SMC clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/369/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/369/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/369/table9?GETtext/xml+votable180.050000true10.5956667-73.53994440.0055555555555555566/33294-33295 33304 33306 33316-33317 333282.367228618189496e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AcA/52/369?format=asciiOpticaldefaultJ/AcA/52/369/table2ab-type RR Lyrae stars from the SMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name (SMC_SCNN)obs.fieldcharStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharPerPerioddtime.perioddoubleT0Reference epoch (HJD)dmeta.ref;time.epochdoubleImagI magnitudemagphot.mag;em.opt.IfloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableBmag? B magnitudemagphot.mag;em.opt.Bfloatnullable_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.mainJ/AcA/52/369/table3c-type RR Lyrae stars from the SMCPerPerioddtime.perioddoubleT0Reference epoch (HJD)dmeta.ref;time.epochdoubleImagI magnitudemagphot.mag;em.opt.IfloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableBmag? B magnitudemagphot.mag;em.opt.Bfloatnullable_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.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name (SMC_SCNN)obs.fieldcharStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharJ/AcA/52/369/table4d-type RR Lyrae stars from the SMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name (SMC_SCNN)obs.fieldcharStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharP1First-overtone perioddtime.perioddoubleP0Fundamental perioddtime.perioddoubleP1/P0Period ratiodtime.period;arith.ratiodoubleImagK magnitudemagphot.mag;em.opt.IfloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableBmag? B magnitudemagphot.mag;em.opt.Bfloatnullable_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.mainJ/AcA/52/369/table5Other variable stars from the SMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name (SMC_SCNN)obs.fieldcharStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharPerPerioddtime.perioddoubleT0Reference epoch (HJD)dmeta.ref;time.epochdoubleImagI magnitudemagphot.mag;em.opt.IfloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableBmag? B magnitudemagphot.mag;em.opt.Bfloatnullable_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.mainJ/AcA/52/369/table6Cross-identification of stars detected in the overlapping regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharField1Field 1 nameobs.fieldcharField2Field 2 nameobs.fieldchar_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.mainJ/AcA/52/369/table9RR Lyr stars close to the SMC clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (OGLEHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharClusterCluster name SMCNNNNmeta.id.parentcharAClusterAlternative cluster namemeta.idcharRadCluster radiusarcsecphys.angSize;srcintDistDistance from the centerarcsecpos.angDistanceint_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.mainFieldField name (SMC_SCNN)obs.fieldchar