J/A+A/450/873ivo://CDS.VizieR/J/A+A/450/873doi:10.26093/cds/vizier.34500873CDSMennickent R.E.Gieren W.Soszynski I.Pietrzynski G.2008-02-02T06:15:21Z2008-02-02T07:12:06ZCDS support team

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

cds-question@unistra.frvariable-starsccd-photometryWe have performed a search for variable stars in the dwarf irregular galaxy NGC 6822 using wide-field multi-epoch VI photometry down to a limiting magnitude of ~22. A part from the Cepheid variables in this galaxy already reported in an earlier paper by Pietrzynski et al. (2004AJ....128.2815P), we have found 1019 "non-periodic" variable stars, 50 periodically variable stars with periods ranging from 0.12 to 66 days and 146 probably periodic variables. Twelve of these stars are eclipsing binaries and fifteen are likely new, low-amplitude Cepheids.2006A&A...450..873Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/450/873CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/789 : Araucaria: NGC 300 Cepheid variables (Pietrzynski+, 2002)J/MNRAS/350/679 : Araucaria: BV phot. of NGC 300 variables (Mennickent+, 2004)J/AJ/128/1167 : Araucaria: NGC 300 Cepheid Variables. II (Gieren+, 2004)J/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001)J/AJ/128/2815 : Araucaria: NGC 6822 Cepheid variables (Pietrzynski+, 2004)J/A+A/431/1189 : BV photometry of NGC 6822 variables (Baldacci+, 2005)J/ApJ/647/1056 : Araucaria: NGC 6822 Cepheid variables (Gieren+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/450/873https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/450/873http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/450/873https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/450/873https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/450/873http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/450/873GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/450/873/table2 (Candidates for periodic stars towards NGC 6822)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/450/873/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/450/873/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/450/873/table2?GETtext/xml+votable180.050000true295.9865-15.06958330.005555555555555556Cone search capability for table J/A+A/450/873/table1 (Periodically variable stars towards NGC 6822)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/450/873/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/450/873/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/450/873/table1?GETtext/xml+votable180.050000true295.981375-14.72469440.005555555555555556Cone search capability for table J/A+A/450/873/table3 (*"Non-periodic" variable stars towards NGC 6822)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/450/873/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/450/873/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/450/873/table3?GETtext/xml+votable180.050000true296.3055-14.97905560.0055555555555555566/29715-29716 29718https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/450/873?format=asciiOpticaldefaultJ/A+A/450/873/table2Candidates for periodic stars towards NGC 6822recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (NNNNN-N)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainTTime scale of variability in I-banddtime.scaleintAmpIAmplitude in the I bandmagsrc.var.amplitude;em.opt.IfloatImag0Dereddened I magnitudemagphot.mag;em.opt.Ifloat(V-I)0? Dereddened V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableImagMean I magnitudemagphot.mag;em.opt.IfloatVmag? Mean V magnitudemagphot.mag;em.opt.VfloatnullableJ/A+A/450/873/table1Periodically variable stars towards NGC 6822recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (NNNNN-N)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainAmpIAmplitude in the I bandmagsrc.var.amplitude;em.opt.IfloatPerPerioddtime.perioddoubleE_PerError in Per (upper limit)dstat.error;stat.maxdoublee_PerError in Per (lower limit)dstat.errordoublen_Per[e MA] Note on Per (1)meta.notecharPer2? Second value of possible period (Per or Per2)dtime.periodfloatnullablee_Per2? rms uncertainty on Per2dstat.errorfloatnullableIMAGAbsolute I magnitudemagphys.magAbs;em.opt.Ifloat(V-I)0? Dereddened V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableImag? Mean I magnitudemagphot.mag;em.opt.IfloatnullableVmag? Mean V magnitudemagphot.mag;em.opt.VfloatnullableT0Time of maxima (or main minima, in the case of eclipsing binaries) in Julian Date -2450000dtime.epochdoublee_T0rms uncertainty on T0dstat.errorfloatJ/A+A/450/873/table3*"Non-periodic" variable stars towards NGC 6822recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarIdentification number of the starmeta.numberintFieldField numbermeta.id;obs.fieldintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainAmpIAmplitude in the I bandmagsrc.var.amplitude;em.opt.IfloatIMAGAbsolute I magnitudemagphys.magAbs;em.opt.Ifloat(V-I)0? Dereddened V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableImagMean I magnitudemagphot.mag;em.opt.IfloatVmag? Mean V magnitudemagphot.mag;em.opt.VfloatnullableS/NRatio between the amplitude of the highest peak in the periodogram and the noise amplitudemeta.notefloat