J/ApJ/870/115ivo://CDS.VizieR/J/ApJ/870/115doi:10.26093/cds/vizier.18700115CDSBono G.Iannicola G.Braga V.F.Ferraro I.Stetson P.B.Magurno D.,Matsunaga N.Beaton R.L.Buonanno R.Chaboyer B.Dall'Ora M.,Fabrizio M.Fiorentino G.Freedman W.L.Gilligan C.K.Madore B.F.,Marconi M.Marengo M.Marinoni S.Marrese P.M.Martinez-Vazquez C.E.,Mateo M.Monelli M.Neeley J.R.Nonino M.Sneden C.Thevenin F.,Valenti E.Walker A.R.2024-11-06T20:22:40Z2020-03-26T09:36:41ZCDS support team

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

cds-question@unistra.frmetallicityglobular-star-clustersvisible-astronomybroad-band-photometryinterstellar-reddeningstellar-distancevariable-starsinfrared-sourcesWe developed a new approach to provide accurate estimates of the metal content, reddening, and true distance modulus of RR Lyrae stars (RRLs). The method is based on homogeneous optical (BVI) and near-infrared (JHK) mean magnitudes and on predicted period-luminosity-metallicity relations (IJHK) and absolute mean magnitude-metallicity relations (BV). We obtained solutions for three different RRL samples in {omega}Cen: first overtone (RRc, 90), fundamental (RRab, 80), and global (RRc+RRab) in which the period of first overtones were fundamentalized. The metallicity distribution shows a well defined peak at [Fe/H]~-1.98 and a standard deviation of {sigma}=0.54dex. The spread is, as expected, metal-poor ([Fe/H]<=-2.3) objects. The current metallicity distribution is ~0.3dex more metal-poor than similar estimates for RRLs available in the literature. The difference vanishes if the true distance modulus we estimated is offset by -0.06/-0.07mag in true distance modulus. We also found a cluster true distance modulus of {mu}=13.720{+/-}0.002{+/-}0.030mag, where the former error is the error on the mean and the latter is the standard deviation. Moreover, we found a cluster reddening of E(B-V)=0.132{+/-}0.002{+/-}0.028mag and spatial variations of the order of a few arcmin across the body of the cluster. Both the true distance modulus and the reddening are slightly larger than similar estimates available in the literature, but the difference is within 1{sigma}. The metallicity dependence of distance diagnostics agrees with theory and observations, but firm constraints require accurate and homogeneous spectroscopic measurements.2019ApJ...870..115Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/870/115CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/119/1225 : Stroemgren photometry of Omega Cen and NGC 6397 (Hughes+, 2000)J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)J/ApJ/640/L43 : Metallicities of RR Lyrae stars in Omega Cen (Sollima+, 2006)J/AJ/133/1447 : Light curves of variable stars in {omega}Cen (Weldrake+, 2007)J/MNRAS/384/1583 : JHK light curves of RR Lyr (Sollima+, 2008)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/AJ/142/187 : HST observations of 7 Pop. II variable stars (Benedict+, 2011)J/ApJS/197/29 : Chemical compositions of 11 RR Lyrae (For+, 2011)J/MNRAS/422/2116 : BHB and RR Lyrae towards Anticentre and NGP (Kinman+, 2012)J/AJ/146/21 : LINEAR. II. Catalog of RR Lyrae stars (Sesar+, 2013)J/ApJ/794/107 : Distance to NGC6822 Spitzer/FourStar Photometry (Rich+, 2014)J/MNRAS/439/3765 : RR Lyrae in 15 Galactic globular clusters (Dambis+, 2014)J/PASP/126/521 : UBVRIJHK photometry of RR Lyrae in M4 (Stetson+, 2014)J/A+A/574/A15 : RR Lyrae in omega Cen (Fernandez-Trincado+, 2015)J/AJ/149/99 : VVV globulars. I. 2MASS-GC 02, Terzan 10 (Alonso-Garcia+, 2015)J/ApJ/814/71 : Carina project IX: UBVI data Carina variables (Coppola+, 2015)J/MNRAS/447/2404 : Equivalent width of 21 RR Lyrae stars (Pancino+, 2015)J/AJ/152/170 : RRLs in globulars. IV. UBVRI phot. in Omega Cen (Braga+, 2016)J/ApJ/832/176 : Classical Cepheids in MCs. I. LMC disk (Inno+, 2016)J/A+A/604/A120 : omega Cen RR Lyrae and SX Phoenicis stars (Navarrete+, 2017)J/AJ/153/154 : LMC NIR survey. IV. Type II Cepheid variables (Bhardwaj+, 2017)J/AJ/154/85 : CTIO/DECam photometry of RR Lyrae stars in M5 (Vivas+, 2017)J/AJ/154/231 : Multi-epoch multi-band photometry of B1-392 (Saha+, 2017)J/ApJ/838/107 : Distances to RRab stars from WISE and Gaia (Sesar+, 2017)J/ApJ/848/68 : Abundances & RVs of stable & Blazhko RRc stars (Sneden+, 2017)J/AJ/155/137 : RRLs in globulars. V. {omega}Centauri NIR phot. (Braga+, 2018)J/ApJ/864/57 : Abundances of field & GC RR Lyrae. I. NGC3201 (Magurno+, 2018)J/AJ/158/105 : IR photometry of field RR Lyrae variable stars (Layden+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/870/115https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/870/115http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/870/115https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/870/115https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/870/115http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/870/115GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/870/115/table1 (Individual iron abundances, reddenings, and true distance moduli for {omega}Cen RR Lyrae stars (RRLs) based on REDIME (REddening, DIstance modulus and MEtallicity) algorithm)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/870/115/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/870/115/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/870/115/table1?GETtext/xml+votable180.050000true201.48391694-47.431750.0055555555555555566/43225 43227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/870/115?format=asciiOpticalInfrareddefaultJ/ApJ/870/115/table1Individual iron abundances, reddenings, and true distance moduli for {omega}Cen RR Lyrae stars (RRLs) based on REDIME (REddening, DIstance modulus and MEtallicity) algorithmrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable identification (1)meta.id;meta.maincharMode[0/1] Pulsation mode: 0=RRab (80 occurrences; 1=RRc (90 occurrences)meta.noteintRAJ2000[201/203] Right ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[-47.7/-47.2] Declination (J2000) (1)degpos.eq.dec;meta.mainNmag[3/6] Number of mean magnitudes adopted for the REDIME solutionmeta.numberint[Fe/H]c[-2.5/-1.2]? Decimal exponant of mean iron abundance based on RRc (2)phys.abund.Fe;stat.meanfloatnullablee_[Fe/H]c[0.05/1.4]? Uncertainty on [Fe/H]cstat.error;phys.abund.FefloatnullableE(B-V)c[0.05/0.2]? Reddening based on RRcmagphot.color.excessfloatnullablee_E(B-V)c[0.01/0.03]? Uncertainty on E(B-V)cmagstat.errorfloatnullableDMc[13.4/13.9]? True distance modulus {mu} based on RRcmagphot.mag.distModfloatnullablee_DMc[0.02/0.2]? Uncertainty on DMcmagstat.errorfloatnullable[Fe/H]ab[-2.5/-1.2]? Decimal exponant of mean iron abundance based on RRab (2)phys.abund.Fefloatnullablee_[Fe/H]ab[0.05/1.5]? Uncertainty on [Fe/H]abstat.error;phys.abund.FefloatnullableE(B-V)ab[0.07/0.21]? Reddening based on RRabmagphot.color.excessfloatnullablee_E(B-V)ab[0.01/0.09]? Uncertainty on E(B-V)abmagstat.errorfloatnullableDMab[13.4/13.9]? True distance modulus {mu} based on RRabmagphot.mag.distModfloatnullablee_DMab[0.02/0.2]? Uncertainty on DMabmagstat.errorfloatnullable[Fe/H]g[-3.4/-1.2] Decimal exponant of mean iron abundance based on global REDIME solution (2)phys.abund.Fefloate_[Fe/H]g[0.01/0.3] Uncertainty on [Fe/H]gstat.error;phys.abund.FefloatE(B-V)g[0.06/0.3] Reddening based on global REDIME solutionmagphot.color.excessfloate_E(B-V)g[0.01/0.06] Uncertainty on E(B-V)gmagstat.errorfloatDMg[13.6/13.8] True distance modulus {mu} based on global REDIME solutionmagphot.mag.distModfloate_DMg[0.01/0.09] Uncertainty on DMgmagstat.errorfloatB18Display data from Braga+, 2018, J/AJ/155/137meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idchar