J/MNRAS/421/2998ivo://CDS.VizieR/J/MNRAS/421/2998doi:10.26093/cds/vizier.74212998CDSFeast M.W.Whitelock P.A.Menzies J.W.Matsunaga N.2024-07-17T20:15:18Z2013-04-12T10:09:17ZCDS support team

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

cds-question@unistra.frgalaxiesvariable-starsinfrared-photometryRecent estimates of the Cepheid distance modulus of NGC 6822 differ by 0.18mag. To investigate this we present new multi-epoch JHKs photometry of classical Cepheids in the central region of NGC 6822 and show that there is a zero-point difference from earlier work. These data together with optical and mid-infrared observations from the literature are used to derive estimates of the distance modulus of NGC 6822. A best value of 23.40mag is adopted, based on a Large Magellanic Cloud (LMC) distance modulus of 18.50mag. The standard error of this quantity is ~0.05mag. We show that to derive consistent moduli from Cepheid observations at different wavelengths, it is necessary that the fiducial LMC period-luminosity relations at these wavelengths should refer to the same subsample of stars. Such a set is provided. A distance modulus based on RR Lyrae variables agrees with the Cepheid result.2012MNRAS.421.2998Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/421/2998CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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)J/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002)J/A+A/429/837 : IJKs photometry of late-type stars in NGC 6822 (Cioni+, 2005)J/A+A/431/1189 : BV photometry of NGC 6822 variables (Baldacci+, 2005)J/A+A/450/873 : Araucaria: NGC 6822 bright variables VI mag (Mennickent+ 2006)J/A+A/454/717 : NGC 6822 near-IR photometry of C and AGB stars (Kang+, 2006)J/A+A/456/905 : JKs, i'g'r' photometry of C stars in NGC 6822 (Demers+, 2006)J/AJ/132/378 : HST and UV photometry of NGC 6822 (Bianchi+, 2006)J/AJ/132/1372 : Chandra observation of NGC 6822 (Tennant+, 2006)J/A+A/495/447 : PN and HII regions in NGC6822 (Hernandez-Martinez+, 2009)J/A+A/537/A108 : NGC 6822 AGB spectroscopic catalogue (Kacharov+, 2012)J/A+A/540/A135 : AGB population of NGC 6822 (Sibbons+, 2012)J/A+A/548/A129 : HST photometry in NGC 6822 (Fusco+, 2012)J/AJ/128/2815 : Araucaria: NGC 6822 Cepheid variables (Pietrzynski+, 2004)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/MNRAS/421/2998https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/421/2998http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/421/2998https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/421/2998https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/421/2998http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/421/2998GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/421/2998/table3 (Flux-weighted mean JHKs for Cepheids in NGC 6822)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/421/2998/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/421/2998/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/421/2998/table3?GETtext/xml+votable180.050000true296.2579167-14.79230560.0055555555555555566/29716 297187.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/421/2998?format=asciiInfrareddefaultJ/MNRAS/421/2998/table3Flux-weighted mean JHKs for Cepheids in NGC 6822recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcep[1/101] Cepheid number, <[PGU2004] cepNNN> in Simbad (1)meta.id;meta.mainintprimaryIRSFIRSF numbermeta.idintJmagFlux-weighted mean J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatHmagFlux-weighted mean H magnitudemagphot.mag;em.IR.Hfloate_Hmagrms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatKsmagFlux-weighted mean Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatJ-HFlux-weighted mean J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-KsFlux-weighted mean H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatJ-KsFlux-weighted mean J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatPerPerioddtime.perioddoubleLCPlot the light curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_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/MNRAS/421/2998/table2Cepheid variables observed in NGC 6822recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintcep[1/101] Cepheid numbermeta.id;meta.mainintRem[abc] Cepheid in overlapping fields (1)meta.notecharHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubleJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag? Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullable