J/ApJ/507/655ivo://CDS.VizieR/J/ApJ/507/655doi:10.26093/cds/vizier.15070655CDSFerrarese L.Bresolin F.Kennicutt R.C.JrSaha A.Stetson P.B.,Freedman W.L.Mould J.R.Madore B.F.Sakai S.Ford H.C.Gibson B.K.,Graham J.A.Han M.Hoessel J.G.Huchra J.Hughes S.M.,Illingworth G.D.Phelps R.Prosser C.F.Silbermann N.A.1999-06-05T22:06:49Z1999-06-05T22:05:58ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe report the detection of Cepheids and a new distance to the spiral galaxy NGC 2541, based on data obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope (HST). A total of 25 exposures (divided into 13 epochs) were obtained using the F555W filter (transformed to Johnson V), and nine exposures were obtained (divided into five epochs) using the F814W filter (transformed to Cousins I). Photometric reduction of the data is performed using two independent packages, DoPHOT and DAOPHOT II/ALLFRAME, which give very good agreement in the measured magnitudes. A total of 34 bona fide Cepheids, with periods ranging from 12 to over 60 days, are identified based on both sets of photometry. By fitting V and I period-luminosity relations, apparent distance moduli are derived assuming a Large Magellanic Cloud distance modulus and mean color excess of {mu}_LMC_=18.50+/-0.10mag and E(B-V)=0.10mag, respectively. Adopting A(V)/E(V-I)=2.45, we obtain a true distance modulus to NGC 2541 of {mu}_0_=30.47+/-0.11 (random) +/-0.12 (systematic) mag (D=12.4+/-0.6 [random] +/-0.7 [systematic] Mpc), and a total (Galactic plus internal) mean color excess E(B-V)=0.08+/-0.05 (internal error) mag.1998ApJ...507..655Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/507/655CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/463/26 : Extragalactic Distance Scale Key Project. III (Kelson+ 1996)J/ApJ/508/491 : M101 Cepheids (Stetson+, 1998)J/ApJ/521/155 : New Cepheids and distance to NGC 4535 (Macri+, 1999)J/ApJ/523/540 : VI photometry of new Cepheids in NGC 3319 (Sakai+, 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/507/655https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/507/655http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/507/655https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/507/655https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/507/655http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/507/655GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/507/655/table5 (Astrometry for the NGC 2541 Cepheids)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table5?GETtext/xml+votable180.050000true123.66412549.02519440.005555555555555556Cone search capability for table J/ApJ/507/655/table12 (Astrometry for other NGC 2541 variable candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table12?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table12?GETtext/xml+votable180.050000true123.665916749.04063890.005555555555555556Cone search capability for table J/ApJ/507/655/table17 (Photometry for the PC secondary standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table17?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table17?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table17?GETtext/xml+votable180.050000true123.674541749.03122220.005555555555555556Cone search capability for table J/ApJ/507/655/table18 (Photometry for the WF2 secondary standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table18?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table18?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table18?GETtext/xml+votable180.050000true123.681208349.03727780.005555555555555556Cone search capability for table J/ApJ/507/655/table19 (Photometry for the WF3 secondary standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table19?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table19?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table19?GETtext/xml+votable180.050000true123.694166749.02563890.005555555555555556Cone search capability for table J/ApJ/507/655/table20 (Photometry for the WF4 secondary standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/507/655/table20?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/507/655/table20?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/507/655/table20?GETtext/xml+votable180.050000true123.67087549.02247220.005555555555555556HSThttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/507/655?format=asciiOpticaldefaultJ/ApJ/507/655/table5Astrometry for the NGC 2541 CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN) (1)meta.id;meta.maincharprimaryXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (3)pos.eq.dec;meta.mainChipChip (PC, WF 2, WF 3, WF 4)meta.id;instrcharJ/ApJ/507/655/table6V (F555W) photometry for NGC 2541 CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryHJDHeliocentric Julian datedtime.epochdoublemagV or I magnitudemagphot.mag;em.opt.Vfloate_magrms uncertainty on magmagstat.errorfloatJ/ApJ/507/655/table7I (F814W) photometry for NGC 2541 CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryHJDHeliocentric Julian datedtime.epochdoublemagV or I magnitudemagphot.mag;em.opt.Vfloate_magrms uncertainty on magmagstat.errorfloatJ/ApJ/507/655/table8DOPHOT mean photometry of the NGC 2541 CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryl_PerLimit flag on Permeta.code.errorcharPerPerioddtime.periodfloatl_Per2Limit flag on Per2meta.code.errorcharPer2? Upper limit for period intervaldtime.period;stat.maxintnullableF555WphPhase-weighted mean F555W magnitudemagphot.mag;em.opt.VfloatF555WavIntensity-averaged mean F555W magnitudemagphot.mag;em.opt.VfloatF814Wph? Phase-weighted mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WphCor? Correction adopted for F814Wph (1)magphot.mag;arith.difffloatnullableF814Wav? Intensity-average mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WavCor? Correction adopted for F814Wav (1)magphot.mag;arith.difffloatnullableVmagph? Phase-weighted mean V magnitudemagphot.mag;em.opt.VfloatnullableVmagav? Intensity-averaged mean V magnitudemagphot.mag;em.opt.VfloatnullableImagph? Phase-weighted mean I magnitudemagphot.mag;em.opt.IfloatnullableImagav? Intensity-averaged mean I magnitudemagphot.mag;em.opt.Ifloatnullablechi2/sigma? Reduced {xi}^2^_r_ value for DoPHOT or {sigma} for ALLFRAMEstat.fit.chi2floatnullableJ/ApJ/507/655/table9Allframe mean photometry of the NGC 2541 CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryl_PerLimit flag on Permeta.code.errorcharPerPerioddtime.periodfloatl_Per2Limit flag on Per2meta.code.errorcharPer2? Upper limit for period intervaldtime.period;stat.maxintnullableF555WphPhase-weighted mean F555W magnitudemagphot.mag;em.opt.VfloatF555WavIntensity-averaged mean F555W magnitudemagphot.mag;em.opt.VfloatF814Wph? Phase-weighted mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WphCor? Correction adopted for F814Wph (1)magphot.mag;arith.difffloatnullableF814Wav? Intensity-average mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WavCor? Correction adopted for F814Wav (1)magphot.mag;arith.difffloatnullableVmagph? Phase-weighted mean V magnitudemagphot.mag;em.opt.VfloatnullableVmagav? Intensity-averaged mean V magnitudemagphot.mag;em.opt.VfloatnullableImagph? Phase-weighted mean I magnitudemagphot.mag;em.opt.IfloatnullableImagav? Intensity-averaged mean I magnitudemagphot.mag;em.opt.Ifloatnullablechi2/sigma? Reduced {xi}^2^_r_ value for DoPHOT or {sigma} for ALLFRAMEstat.fit.chi2floatnullableJ/ApJ/507/655/table12Astrometry for other NGC 2541 variable candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN) (1)meta.id;meta.maincharprimaryXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (3)pos.eq.dec;meta.mainChipChip (PC, WF 2, WF 3, WF 4)meta.id;instrcharJ/ApJ/507/655/table13V photometry for other NGC 2541 variable candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryHJDHeliocentric Julian datedtime.epochdoublemagV or I magnitudemagphot.mag;em.opt.Vfloate_magrms uncertainty on magmagstat.errorfloatJ/ApJ/507/655/table14I photometry for other NGC 2541 variable candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryHJDHeliocentric Julian datedtime.epochdoublemagV or I magnitudemagphot.mag;em.opt.Vfloate_magrms uncertainty on magmagstat.errorfloatJ/ApJ/507/655/table15DOPHOT mean photometry of other NGC 2541 variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryl_PerLimit flag on Permeta.code.errorcharPerPerioddtime.periodfloatl_Per2Limit flag on Per2meta.code.errorcharPer2? Upper limit for period intervaldtime.period;stat.maxintnullableF555WphPhase-weighted mean F555W magnitudemagphot.mag;em.opt.VfloatF555WavIntensity-averaged mean F555W magnitudemagphot.mag;em.opt.VfloatF814Wph? Phase-weighted mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WphCor? Correction adopted for F814Wph (1)magphot.mag;arith.difffloatnullableF814Wav? Intensity-average mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WavCor? Correction adopted for F814Wav (1)magphot.mag;arith.difffloatnullableVmagph? Phase-weighted mean V magnitudemagphot.mag;em.opt.VfloatnullableVmagav? Intensity-averaged mean V magnitudemagphot.mag;em.opt.VfloatnullableImagph? Phase-weighted mean I magnitudemagphot.mag;em.opt.IfloatnullableImagav? Intensity-averaged mean I magnitudemagphot.mag;em.opt.Ifloatnullablechi2/sigma? Reduced {xi}^2^_r_ value for DoPHOT or {sigma} for ALLFRAMEstat.fit.chi2floatnullableJ/ApJ/507/655/table16Allframe mean photometry of other NGC 2541 variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryl_PerLimit flag on Permeta.code.errorcharPerPerioddtime.periodfloatl_Per2Limit flag on Per2meta.code.errorcharPer2? Upper limit for period intervaldtime.period;stat.maxintnullableF555WphPhase-weighted mean F555W magnitudemagphot.mag;em.opt.VfloatF555WavIntensity-averaged mean F555W magnitudemagphot.mag;em.opt.VfloatF814Wph? Phase-weighted mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WphCor? Correction adopted for F814Wph (1)magphot.mag;arith.difffloatnullableF814Wav? Intensity-average mean F814W magnitudemagphot.mag;em.opt.IfloatnullableF814WavCor? Correction adopted for F814Wav (1)magphot.mag;arith.difffloatnullableVmagph? Phase-weighted mean V magnitudemagphot.mag;em.opt.VfloatnullableVmagav? Intensity-averaged mean V magnitudemagphot.mag;em.opt.VfloatnullableImagph? Phase-weighted mean I magnitudemagphot.mag;em.opt.IfloatnullableImagav? Intensity-averaged mean I magnitudemagphot.mag;em.opt.Ifloatnullablechi2/sigma? Reduced {xi}^2^_r_ value for DoPHOT or {sigma} for ALLFRAMEstat.fit.chi2floatnullableJ/ApJ/507/655/table17Photometry for the PC secondary standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position (1)pixpos.cartesian.x;instr.detfloatYposY position (1)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainF555WF555W magnitude(3)magphot.mag;em.opt.Vfloate_F555Wrms uncertainty on F555Wmagstat.errorfloatF814WF814W magnitude (3)magphot.mag;em.opt.Ifloate_F814Wrms uncertainty on F814Wmagstat.errorfloatVmagV magnitude (4)magphot.mag;em.opt.VfloatImagI magnitude (4)magphot.mag;em.opt.IfloatJ/ApJ/507/655/table18Photometry for the WF2 secondary standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position (1)pixpos.cartesian.x;instr.detfloatYposY position (1)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainF555WF555W magnitude(3)magphot.mag;em.opt.Vfloate_F555Wrms uncertainty on F555Wmagstat.errorfloatF814WF814W magnitude (3)magphot.mag;em.opt.Ifloate_F814Wrms uncertainty on F814Wmagstat.errorfloatVmagV magnitude (4)magphot.mag;em.opt.VfloatImagI magnitude (4)magphot.mag;em.opt.IfloatJ/ApJ/507/655/table19Photometry for the WF3 secondary standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position (1)pixpos.cartesian.x;instr.detfloatYposY position (1)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainF555WF555W magnitude(3)magphot.mag;em.opt.Vfloate_F555Wrms uncertainty on F555Wmagstat.errorfloatF814WF814W magnitude (3)magphot.mag;em.opt.Ifloate_F814Wrms uncertainty on F814Wmagstat.errorfloatVmagV magnitude (4)magphot.mag;em.opt.VfloatImagI magnitude (4)magphot.mag;em.opt.IfloatJ/ApJ/507/655/table20Photometry for the WF4 secondary standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position (1)pixpos.cartesian.x;instr.detfloatYposY position (1)pixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainF555WF555W magnitude(3)magphot.mag;em.opt.Vfloate_F555Wrms uncertainty on F555Wmagstat.errorfloatF814WF814W magnitude (3)magphot.mag;em.opt.Ifloate_F814Wrms uncertainty on F814Wmagstat.errorfloatVmagV magnitude (4)magphot.mag;em.opt.VfloatImagI magnitude (4)magphot.mag;em.opt.IfloatJ/ApJ/507/655/note5Individual notes on CepheidsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryNoteText of the note (1)meta.notecharJ/ApJ/507/655/note12Individual notes on other variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FBK98]Identification (CNN or VNN)meta.id;meta.maincharprimaryNoteText of the note (1)meta.notechar