J/ApJ/845/146ivo://CDS.VizieR/J/ApJ/845/146doi:10.26093/cds/vizier.18450146CDSHatt D.Beaton R.L.Freedman W.L.Madore B.F.Jang I.-S.Hoyt T.J.,Lee M.G.Monson A.J.Rich J.A.Scowcroft V.Seibert M.2018-09-18T15:29:28Z2018-05-15T09:01:04ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-distancevariable-starspopulation-ii-starshst-photometryIC 1613 is an isolated dwarf galaxy within the Local Group. Low foreground and internal extinction, low metallicity, and low crowding make it an invaluable testbed for the calibration of the local distance ladder. We present new, high-fidelity distance estimates to IC 1613 via its Tip of the Red Giant Branch (TRGB) and its RR Lyrae (RRL) variables as part of the Carnegie-Chicago Hubble Program, which seeks an alternate local route to H_0_ using Population II stars. We have measured a TRGB magnitude I_ACS_^TRGB^=20.35+/-0.01_stat_+/-0.01_sys_mag using wide-field observations obtained from the IMACS camera on the Magellan-Baade telescope. We have further constructed optical and near-infrared RRL light curves using archival BI- and new H-band observations from the ACS/WFC and WFC3/IR instruments on board the Hubble Space Telescope (HST). In advance of future Gaia data releases, we set provisional values for the TRGB luminosity via the Large Magellanic Cloud and Galactic RRL zero-points via HST parallaxes. We find corresponding true distance moduli {mu}_0_^TRGB^=24.30+/-0.03_stat_+/-0.05_sys_mag and <{mu}_0_^RRL^>=24.28+/-0.04_stat+sys_mag. We compare our results to a body of recent publications on IC 1613 and find no statistically significant difference between the distances derived from Population I and II stars.2017ApJ...845..146Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/845/146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/363/29 : Variable stars in IC 1613 (Antonello+, 2000)J/A+A/367/759 : Variable stars in IC 1613 (Mantegazza+, 2001)J/AcA/51/221 : OGLE-II. Cepheids in IC 1613 (Udalski+, 2001)J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004)J/A+A/445/901 : BV(RI)c bands of Cepheids in IC 1613 (Antonello+, 2006)J/ApJ/712/1259 : LCID project. II. Variables in IC1613 (Bernard+, 2010)J/AJ/142/187 : HST obs. of 7 Pop.II variable stars (Benedict+, 2011)J/ApJ/743/76 : Spitzer photometry of LMC Cepheids (Scowcroft+, 2011)J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/MNRAS/435/3206 : Properties of field RR Lyrae variables (Dambis+, 2013)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/ApJ/807/127 : 70 RR Lyrae stars data in the LMC bar (Muraveva+, 2015)J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)J/AJ/153/96 : Standard Galactic field RR Lyrae. I. Phot. (Monson+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/845/146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/845/146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/845/146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/845/146https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/845/146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/845/146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/845/146/table5 (IC 1613 RR Lyrae (RRL) ACS/WFC WCS Circa 2017 & photometry notes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/845/146/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/845/146/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/845/146/table5?GETtext/xml+votable180.050000true16.0870832.176750.0055555555555555566/18041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/845/146?format=asciidefaultJ/ApJ/845/146/table5IC 1613 RR Lyrae (RRL) ACS/WFC WCS Circa 2017 & photometry notesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VNNN) (G1)meta.id;meta.maincharprimaryRAJ2000[1] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[2] Degree of Declination (J2000)pos.eq.dec;meta.mainNotesNotes ("Blend": 12 occurrences; "Possible-blend": 4 occurrences) (G1)meta.notecharFiltFilter notes (G1)meta.note;instr.filterchar<F160W>[22.3/24.4]? Average HST WFC3/IR F160W magnitude, Vega magmagphot.mag;em.IR.HfloatnullableNpNumber of photometry measurements for this starmeta.numberintnullableLCLCs interactive plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/845/146/table6Variable star photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMG2010]Object identification (VNNN) (G1)meta.id;meta.maincharFiltFilter used (F475W, F814W or F160W)instr.setup;instr.filtercharMJDObservation time, mid-exposure, JD-2400000.5dtime.epochdoublePhasePhasetime.phasefloatomag[21.9/65.2] Observed magnitude in Filtmagphot.magfloate_omag[0.02/7.1] Uncertainty in omagmagstat.error;phot.magfloat