J/AJ/154/263ivo://CDS.VizieR/J/AJ/154/263doi:10.26093/cds/vizier.51540263CDSKarczmarek P.Pietrzynski G.Gorski M.Gieren W.Bersier D.2018-10-22T07:48:27Z2018-09-10T07:44:29ZCDS support team

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

cds-question@unistra.frgalaxiesvariable-starsinfrared-photometryWe have obtained single-phase near-infrared (NIR) magnitudes in the J and K bands for 77 RR Lyrae (RRL) stars in the Fornax Dwarf Spheroidal Galaxy. We have used different theoretical and empirical NIR period-luminosity-metallicity calibrations for RRL stars to derive their absolute magnitudes, and found a true, reddening-corrected distance modulus of 20.818+/-0.015(statistical)+/-0.116(systematic) mag. This value is in excellent agreement with the results obtained within the Araucaria Project from the NIR photometry of red clump stars (20.858+/-0.013 mag), the tip of the red giant branch (20.84+/-0.04+/-0.14 mag), as well as with other independent distance determinations to this galaxy. The effect of metallicity and reddening is substantially reduced in the NIR domain, making this method a robust tool for accurate distance determination at the 5% level. This precision is expected to reach the level of 3% once the zero points of distance calibrations are refined thanks to the Gaia mission. NIR period-luminosity-metallicity relations of RRL stars are particularly useful for distance determinations to galaxies and globular clusters up to 300 kpc, that lack young standard candles, like Cepheids.2017AJ....154..263Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/263CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/840 : VI photometry of variable stars in Fornax (Bersier+, 2002)J/MNRAS/345/747 : RR Lyrae in 4 Fornax globular clusters (Mackey+, 2003)J/ApJ/685/947 : SX Phe stars in Fornax. II. (Poretti+, 2008)J/ApJ/701/1323 : Variable stars in Fornax dSph. III. (Greco+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/263https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/263http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/263https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/263https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/263http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/263GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/154/263/table4 (Cross-identification and main characteristics of 77 RR Lyrae stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/263/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/263/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/263/table4?GETtext/xml+votable180.050000true39.863625-34.40705560.0055555555555555566/359691.1272223222287162e-19 1.3477869400901534e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/154/263?format=asciiInfrareddefaultJ/AJ/154/263/table4Cross-identification and main characteristics of 77 RR Lyrae starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFBWStar identifier (FBW JHHMMSS.s+DDMMSS) (1)meta.id;meta.maincharFieldHAWK-I fieldmeta.id;obs.fieldcharRAJ2000Hour of Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainPer[0.33563/0.6754] Pulsational perioddtime.perioddoubleRRtype[ab c] Type of RR Lyrae star (1)meta.code;src.varcharJmag[19.989/20.755] HAWK-I apparent magnitude in J-bandmagphot.mag;em.IR.Jfloate_Jmag[0.011/0.031] Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatKsmag[19.806/20.499] HAWK-I apparent magnitude in K_s_-bandmagphot.mag;em.IR.Kfloate_Ksmag[0.027/0.055] Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatJD-JJulian date of J-band exposuredtime.epochdoubleJD-KsJulian date of K_s_-band exposuredtime.epochdouble