J/AcA/52/241ivo://CDS.VizieR/J/AcA/52/241doi:10.26093/cds/vizier.120520241CDSEyer L.2025-09-25T20:14:53Z2007-05-01T19:28:05ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsphotometryA search for faint slowly variable objects was undertaken in the hope of finding QSO candidates behind the Small and Large Magellanic Clouds (SMC and LMC). This search used the optical variability properties of point sources from the Magellanic Cloud OGLE-II photometric data. Objects bluer than V-I=0.9mag and within 17mag<I<20.5mag were studied. Robust variograms/structure functions have been computed for each time-series and only candidates showing a significantly increasing variability over longer time scales were selected. Several light curves were identified as having probable artifacts and were therefore removed. Stars showing signs of periodicity or small trends in their light curves were also removed and we are left with mostly either Be stars ({gamma} Cas stars) or QSO candidates. We present a list of 25 slowly varying objects for SMC and 155 for LMC, out of 15000 and 53000 variable objects respectively. Of these, about 15 objects for the SMC and 118 objects for the LMC are QSO candidates.2002AcA....52..241Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/52/241CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/48/113 : OGLE RR Lyrae VI photometry (Udalski, 1998)J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)J/AcA/48/175 : OGLE SMC clusters (Pietrzynski+ 1998)J/AcA/48/563 : OGLE SMC eclipsing binaries BVI photometry (Udalski+ 1998)J/AcA/49/223 : VI photometry of OGLE LMC Cepheids (Udalski+, 1999)J/AcA/49/437 : BVI photometry of OGLE SMC Cepheids (Udalski+, 1999)J/AcA/49/521 : OGLE LMC star clusters BVI photometry (Pietrzynski+, 1999)J/AcA/49/543 : OGLE LMC + SMC Cepheids VI photometry (Pietrzynski+, 1999)J/AcA/50/337 : OGLE LMC star clusters (Pietrzynski+, 2000)J/AcA/51/317 : OGLE. Catalog of LMC and SMC images (Zebrun+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/52/241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/52/241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/52/241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/52/241https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/52/241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/52/241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AcA/52/241/var (Slow variables in OGLE-II data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/52/241/var?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/52/241/var?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/52/241/var?GETtext/xml+votable180.050000true9.711625-73.18141670.0055555555555555565/8274 6/33053 33077 33089-33091 33120 33294-33295 33306 33316-33317https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AcA/52/241?format=asciiOpticaldefaultJ/AcA/52/241/varSlow variables in OGLE-II datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegSimbad column added by the CDSobs.fieldcharSeqSequential number (S NN, LNNN)meta.recordcharOGLEOGLE designation (HHMMSS.ss+DDMMSS)meta.id;meta.maincharImagI magnitudemagphot.mag;em.opt.Ifloato_ImagNumber of measurements in I bandmeta.numberintVmagV magnitudemagphot.mag;em.opt.VfloatBmagB magnitudemagphot.mag;em.opt.BfloatClass[QC Be U] Classification (1)src.classcharDistNearest distance to a saturated pixelpixpos.angDistanceint_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main