J/ApJ/514/614ivo://CDS.VizieR/J/ApJ/514/614doi:10.26093/cds/vizier.15140614CDSKelson D.D.Illingworth G.D.Saha A.Graham J.A.Stetson P.B.,Freedman W.L.Kennicutt R.C.Mould J.R.Ferrarese L.Huchra J.P.,Madore B.F.Prosser C.F. Bresolin F.Ford H.C.Gibson B. K.,Hoessel J.G.Hughes S.M.G.Macri L.M.Sakai S.Silbermann M.A.2000-02-24T07:16:24Z2000-02-24T08:15:20ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe report the detection of Cepheid variable stars and a new distance to the Sc spiral NGC 3198. NGC 3198 is one of 25 galaxies that have been observed with the WFPC2 of the Hubble Space Telescope (HST) for the purpose of measuring Cepheid distances. Eighteen of these galaxies were targeted by the HST Key Project on the Extragalactic Distance Scale, whose objective is to calibrate a variety of secondary distant indicators and determine the Hubble constant to an accuracy of 10%. NGC 3198 was selected as part of this sample because its type and orientation make it very suitable as a Tully-Fisher calibrator. The WFPC2 data are comprised of 13 epochs in F555W ({~}V) and five epochs in F814W ({~}I). Two different crowded-field photometry packages (DAOPHOT/ALLFRAME and DoPHOT) were used. The magnitudes derived from these two packages agree to within a few percent. We identified 78 Cepheid candidates in the period range from eight to >50 days, of which 52 were selected for establishing the distance modulus. Period-luminosity relations were constructed in Johnson V and Kron-Cousins I by transforming the F555W and F814W to the standard system. We adopted a distance modulus of {mu}_o_=18.50{+/-}0.10 mag and mean reddening of E(B-V)=0.10 mag to the Large Magellanic Cloud Cepheids and found a true distance modulus to NGC 3198 of {mu}_o_=30.80{+/-}0.16 (random) {+/-}0.12 (systematic) mag. This modulus corresponds to a distance of 14.5 Mpc, with random and systematic errors of {+/-}1.2 and {+/-}0.9 Mpc, respectively. Objects -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 10 19 55 +45 33 09 NGC 3198 = UGC 5572 --------------------------------------------1999ApJ...514..614Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/514/614CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/463/26 : Extragalactic Distance Scale Key Project. III (Kelson+ 1996)J/ApJ/507/655 : VI photometry of new Cepheids in NGC 2541 (Ferrarese+, 1998)J/ApJ/508/491 : M101 Cepheids (Stetson+, 1998)J/ApJ/521/155 : Extragalactic distance scale key project. XVIII. (Macri+, 1999)J/ApJ/529/723 : VI photometry of Cepheids (Gibson+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/514/614https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/514/614http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/514/614https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/514/614https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/514/614http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/514/614GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/514/614/table5 (Cepheid positions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/514/614/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/514/614/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/514/614/table5?GETtext/xml+votable180.050000true155.000083345.56811390.005555555555555556HST6/5751https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/514/614?format=asciiOpticaldefaultJ/ApJ/514/614/table5Cepheid positionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCNameCepheid namecharprimaryChipWFPC chip Cepheid is located in (1 is the PC chip)intXPosX position on the chipfloatYPosY position on the chipfloatRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)J/ApJ/514/614/table6Cepheid mean magnitudes and periodsCNameCepheid namecharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intUse[YN] indicates if the Cepheid was used in the Period-Luminosity analysischarl_Periodlimit on PeriodcharPeriodCepheid perioddfloatE_Period? Uncertainty in Period. If e_Period exists this value is the upper limitdfloatnullablee_Period? Lower limit in PerioddfloatnullableI.VmagIntensity weighted mean V band magnitudemagfloate_I.VmagUncertainty in I.VmagmagfloatI.Imag? Intensity weighted mean I band magnitudemagfloatnullablee_I.Imag? Uncertainty in I.ImagmagfloatnullableP.VmagPhase weighted mean V band magnitudemagfloate_P.VmagUncertainty in P.VmagmagfloatP.Imag? Phase weighted mean I band magnitudemagfloatnullablee_P.Imag? Uncertainty in P.ImagmagfloatnullableJ/ApJ/514/614/tablea1Cepheid F555W photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCNameCepheid namecharprimaryJD-2400000Julian date (-2400000) of observationdoubleVmagV Band magnitudemagfloate_VmagUncertainty in VmagmagfloatJ/ApJ/514/614/tablea2Cepheid F814W photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCNameCepheid namecharprimaryJD-2400000Julian date (-2400000) of observationdoubleImagI Band magnitudemagfloate_ImagUncertainty in Vmagmagfloat