J/A+A/431/1189ivo://CDS.VizieR/J/A+A/431/1189doi:10.26093/cds/vizier.34311189CDSBaldacci L.Rizzi L.Clementini G.Held E.V.2017-07-12T15:02:22Z2005-03-30T22:52:55ZCDS support team

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

cds-question@unistra.frvariable-starsccd-photometryvisible-astronomybroad-band-photometryDeep B, V time-series photometry obtained with the ESO Very Large Telescope has been used to identify variable stars in the dwarf irregular galaxy NGC 6822. We surveyed a 6.8x6.8 arcmin area of the galaxy and detected a total number of 390 candidate variables with the optimal image subtraction technique (Alard C., 2000A&AS..144..363A). Light curves on a magnitude scale were obtained for 262 of these variables. Differential flux light curve are available for the remaining sample. We were able to determine periods and pulsation characteristics for 69 out of the 262 variables with light curves in magnitude scale, they include: 18 RR Lyrae stars (16 ab-type and 2 c-type), 45 Cepheids and 6 binary systems. We also tentatively calibrated 8 of the 128 objects with light curves on a differential flux scale on the assumption that they are ab-type RR Lyrae stars.2005A&A...431.1189Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/431/1189CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/430/603 : BVI photometry of LMC bar variables (Di Fabrizio+, 2005)J/A+A/429/837 : IJKs photometry of late-type stars in NGC 6822 (Cioni+, 2005)J/AJ/109/173 : BVR photometry of NGC 6822 (Marconi+ 1995)J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995)J/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/431/1189https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/431/1189http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/431/1189https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/431/1189https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/431/1189http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/431/1189GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/431/1189/stars (List of candidate variable stars (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/431/1189/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/431/1189/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/431/1189/stars?GETtext/xml+votable180.050000true296.3535-14.820350.0055555555555555566/29716 297183.322582951404819e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/431/1189?format=asciiOpticaldefaultJ/A+A/431/1189/meanMean values of periodic variables (tables 4, 5 and 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar running identifier, ordered by increasing declinationmeta.idcharVcmeta.code;src.varcharIDStar ID (G1)meta.id;meta.maincharTypeRR Lyrae typemeta.notecharPPerioddtime.periodfloatEp-2452000HJD-2452000 of maximum (pulsating variables) or deeper minimum (binaries) lightdtime.epochdoubleo_BmagNumber of data-points available on the B curvemeta.numberinto_VmagNumber of data-points available on the V curvemeta.numberint<Bmag>Intensity-averaged mean B magnitudemagphot.mag;em.opt.Bfloatu_<Bmag>Uncertainty flag on <Bmag>meta.code.errorchar<Vmag>Intensity-averaged mean V magnitudemagphot.mag;em.opt.Vfloatu_<Vmag>Uncertainty flag on <Vmag>meta.code.error;pos.cartesian.ycharl_ABLimit flag on ABmeta.code.errorcharABAmplitude of the B light variationmagphot.mag;em.opt.Bfloatl_AVLimit flag on AVmeta.code.errorcharAVAmplitude of the V light variationmagphot.mag;em.opt.VfloatresB? Residual in B band (2)magstat.fit.residualfloatnullableresVResidual in V band (2)magstat.fit.residualfloatNotesNotes (1)meta.notecharVlcV light curve filename in "lc" subdirectorymeta.id;pos.cartesian.ycharBlcB light curve filename in "lc" subdirectorymeta.idcharJ/A+A/431/1189/starsList of candidate variable stars (Table 2)NotesNotes (4)meta.notecharIDStar ID (G1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar running identifier, ordered by increasing declinationmeta.idcharprimaryRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainVmag? V magnitude (1)magphot.mag;em.opt.VfloatnullableB-V? B-V colour index (1)magphot.color;em.opt.B;em.opt.VfloatnullableTypeStar type (2)meta.code;src.varcharmeanindicates stars having mean values in tables 4, 5 or 6meta.ref.urlcharCross-idOther identifications (3)meta.idchar