J/AJ/149/183ivo://CDS.VizieR/J/AJ/149/183doi:10.26093/cds/vizier.51490183CDSHoffmann S.L.Macri L.M.2017-06-01T08:52:07Z2015-06-19T15:42:59ZCDS support team

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

cds-question@unistra.frgalaxiesvariable-starspopulation-ii-starsinfrared-photometryvisible-astronomybroad-band-photometryastronomical-object-identificationWe present results of a ground-based survey for Cepheid variables in NGC4258. This galaxy plays a key role in the Extragalactic Distance Scale due to its very precise and accurate distance determination via very long baseline interferometry observations of water masers. We imaged two fields within this galaxy using the Gemini North telescope and the Gemini Multi-Object Spectrograph, obtaining 16 epochs of data in the Sloan Digital Sky Survey gri bands over 4yr. We carried out point-spread function photometry and detected 94 Cepheids with periods between 7 and 127 days, as well as an additional 215 variables which may be Cepheids or Population II pulsators. We used the Cepheid sample to test the absolute calibration of theoretical gri Period-Luminosity relations and found good agreement with the maser distance to this galaxy. The expected data products from the Large Synoptic Survey Telescope should enable Cepheid searches out to at least 10Mpc.2015AJ....149..183Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/183CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/AJ/149/117 : LMC infrared survey. I. Photometry of Cepheids (Macri+, 2015)J/ApJ/659/1040 : VLBI monitoring of NGC 4258 (Argon+, 2007)J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006)J/A+A/268/419 : HII Regions in NGC 4258 (Courtes+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/183https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/183http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/183https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/183https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/183http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/183GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/183/table3 (Secondary standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/183/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/183/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/183/table3?GETtext/xml+votable180.050000true184.3915247.2480.005555555555555556Cone search capability for table J/AJ/149/183/variables (Cepheids and other variables in NGC 4258)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/183/variables?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/183/variables?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/183/variables?GETtext/xml+votable180.050000true184.8450247.243990.0055555555555555566/10977 10979 10980 109822.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/183?format=asciiOpticalInfrareddefaultJ/AJ/149/183/table3Secondary standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmag[15/25] SDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagUncertainty in gmagmmagstat.error;phot.mag;em.opt.Bintrmag[14.5/24.5] SDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagUncertainty in rmagmmagstat.error;phot.mag;em.opt.Rintimag[14/24.5] SDSS i magnitudemagphot.mag;em.opt.Ifloate_imagUncertainty in imagmmagstat.error;phot.mag;em.opt.IintCalUsed in calibration (SW or WG) (1)meta.note;instr.calibcharJ/AJ/149/183/table8Light curve datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarVariable identifier (G1)meta.id;meta.maincharMJDModified Julian Date (JD-2400000.5)dtime.epochdoubleBand[gri] Bandpass used in observation (SDSS g, r, or i)instr.bandpasscharmag[21.1/27.5] Magnitude in Bandmagphot.magfloate_magUncertainty in mag (G2)mmagstat.error;phot.magintPhase[0/999] Phase (*10^3^)time.phaseintJ/AJ/149/183/variablesCepheids and other variables in NGC 4258recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarVariable identifier (G1)meta.id;meta.maincharprimaryNpNumber of photometric points for this starmeta.numberintnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainPer[6.975/157] Perioddtime.periodfloat<rmag>[21.5/26.1] Mean magnitude in SDSS r bandmagphot.mag;em.opt.Rfloate_<rmag>[1/45] Uncertainty in <rmag> (G2)magstat.error;phot.mag;em.opt.Rfloat<imag>[21.42/25.7] Mean magnitude in SDSS i bandmagphot.mag;em.opt.Ifloate_<imag>[1/65] Uncertainty in <imag> (G2)magstat.error;phot.mag;em.opt.Ifloat<gmag>[22.1/26.9]? Mean magnitude in SDSS g bandmagphot.mag;em.opt.Bfloatnullablee_<gmag>[1/83]? Uncertainty in <gmag> (G2)magstat.error;phot.mag;em.opt.BfloatnullablerAmp[105/813] Light curve amplitude in SDSS r bandmmagsrc.var.amplitude;em.opt.RintiAmp[100/625] Light curve amplitude in SDSS i bandmmagsrc.var.amplitude;em.opt.IintgAmp[112/1059]? Light curve amplitude in SDSS g bandmmagsrc.var.amplitude;em.opt.BintnullableQA[ABC] Quality flag on variability based on amplitude ratio (1)meta.code.qual;src.var.amplitudecharQR[ABC] Quality flag on variability based on Period-Luminosity (P-L) residual (1)meta.code.qualcharLCLight Curvemeta.ref.urlcharF14[4/64]? Cross-identification with Fausnaugh et al. (2014; arXiv:1303.5076)meta.id.crossintnullableM06Cross-identification with Macri et al. 2006 (J/ApJ/652/1133 <[MSB2006] A-NNNNNN> in Simbad)meta.id.crosschar