J/MNRAS/438/2440ivo://CDS.VizieR/J/MNRAS/438/2440doi:10.26093/cds/vizier.74382440CDSDeb S.Singh H.P.2024-08-08T20:12:22Z2015-02-19T16:12:03ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvariable-starsWe present a careful and detailed light-curve analysis of publicly available I-band data on fundamental mode RR Lyrae (RRab) stars of the Large Magellanic Cloud (LMC) obtained by the Optical Gravitational Lensing Experiment phase-III project. Using the Fourier parameters of 13095 RRab stars, metallicities and absolute magnitudes of individual stars are obtained. The representation of stars on the P-{phi}_31_^V^ plane shows the existence of three significant metallicity groups with mean metallicities as -1.20+/-0.12, -1.57+/-0.10 and -1.89+/-0.09dex. The corresponding absolute magnitudes of these three groups are obtained as 0.70+/-0.08, 0.59+/-0.06 and 0.49+/-0.08mag, respectively. Distribution of these three groups as a function of vertical |z| distance indicates that the formation of the LMC disc predates the formation of the inner halo. Issue of the existence of a metallicity gradient as a function of galactocentric distances has also been addressed. Approximating the structure of the LMC disc as a triaxial ellipsoid, the inclination angle (i) relative to the plane of the sky and the position angle of the line of nodes ({theta}_lon_) were estimated as 24.20{deg} and 176.01{deg}, respectively. The axes ratios and the eccentricity were also determined using the principal axis transformation method.2014MNRAS.438.2440Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/438/2440CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/59/1 : VI light curves of LMC RR Lyrae stars (Soszynski+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/438/2440https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/438/2440http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/438/2440https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/438/2440https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/438/2440http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/438/2440GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/438/2440/RRstars (Results of the Fourier analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/438/2440/RRstars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/438/2440/RRstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/438/2440/RRstars?GETtext/xml+votable180.050000true66.9394583-70.720.0055555555555555564/2068 5/8261 8263 8268-8269 8271 8280 9376 9378 6/33049 33051 33069 33080-33081 33083 33104-33106 33112 33124-33126 33128-33130 37416 37418 37536 375382.367228618189496e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/438/2440?format=asciiOpticaldefaultJ/MNRAS/438/2440/RRstarsResults of the Fourier analysisOGLE[1/24902] OGLE-LMC-RRLYR identification number, <OGLE LMC-RRLYR-NNNN> in Simbad.meta.id;meta.mainintprimary[Fe/H][-2.5/-0.8] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H] (1)log(Sun)stat.error;phys.abund.FefloatVMAG[0.2/1.1] Absolute V magnitudemagphys.magAbs;em.opt.Vfloate_VMAGrms uncertainty on VMAG (1)magstat.errorfloatlogLLuminositylog(solLum)phys.luminosityfloate_logLrms uncertainty on logL (1)log(solLum)stat.errorfloat<Imag>Average I magnitudemagphot.mag;em.opt.Ifloat<Vmag>Average V magnitudemagphot.mag;em.opt.VfloatMOD[16.3/20.2] Distance modulusmagphot.mag.distModfloate_MODrms uncertainty no MOD (1)magstat.errorfloatDist[18/107] Distancekpcpos.distancefloate_Distrms uncertainty on Dist (1)kpcstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharLCLight curve (from OGLE data)meta.ref.urlcharPer[0.4/0.83] Perioddtime.perioddoubleA0[17/21] Fundamental Fourier coefficient A_0_ (2)magsrc.var.amplitudedoublee_A0rms uncertainty on A0magstat.errordoubleA1First order Fourier coefficient A_1_ (2)magsrc.var.amplitudedoublee_A1rms uncertainty on A1magstat.errordoubleA2Second order Fourier coefficient A_2_ (2)magsrc.var.amplitudedoublee_A2rms uncertainty on A2magstat.errordoubleA3Third order Fourier coefficient A_3_ (2)magsrc.var.amplitudedoublee_A3rms uncertainty on A3magstat.errordoubleA4Fourth order Fourier coefficient A_4_ (2)magsrc.var.amplitudedoublee_A4rms uncertainty on A4magstat.errordoublephi1[0/6.283] {phi}_1_ Fourier coefficient (2)radstat.Fourierdoublee_phi1rms uncertainty on phi1radstat.errordoublephi2[0/6.283] {phi}_2_ Fourier coefficient (2)radstat.Fourierdoublee_phi2rms uncertainty on phi2radstat.errordoublephi3[0/6.283] {phi}_3_ Fourier coefficient (2)radstat.Fourierdoublee_phi3rms uncertainty on phi3radstat.errordoublephi4[0/6.283] {phi}_4_ Fourier coefficient (2)radstat.Fourierdoublee_phi4rms uncertainty on phi4radstat.errordoubleNobs[42/1600] Number of observationsmeta.numberintchi2r[0/15] Reduced {chi}^2^ valuestat.fit.chi2floatsigfit[0.01/0.21] {sigma}_fit_magstat.errorfloatAIAmplitude in I bandmagsrc.var.amplitudedoublee_AIrms uncertainty on AImagstat.errordoubleR21R_21_ = A_2_/A_1_ Fourier coefficientphot.mag;arith.ratiodoublee_R21rms uncertainty on R21stat.errordoubleR31R_31_ = A_3_/A_1_ Fourier coefficientphot.mag;arith.ratiodoublee_R31rms uncertainty on R31stat.errordoubleR41R_41_ = A_4_/A_1_ Fourier coefficientphot.mag;arith.ratiodoublee_R41rms uncertainty on R41stat.errordoublephi21[0/6.283] {phi}_21_ Fourier coefficientradstat.Fourierdoublee_phi21rms uncertainty on phi21radstat.errordoublephi31[0/6.283] {phi}_31_ Fourier coefficientradstat.Fourierdoublee_phi31rms uncertainty on phi31radstat.errordoublephi41[0/6.283] {phi}_41_ Fourier coefficientradstat.Fourierdoublee_phi41rms uncertainty on phi41radstat.errordouble_RAPosition from Soszynski et al. 2009 (J/AcA/59/1) (right ascension part)degpos.eq.ra;meta.main_DEPosition from Soszynski et al. 2009 (J/AcA/59/1) (declination part)degpos.eq.dec;meta.main