J/MNRAS/434/1681ivo://CDS.VizieR/J/MNRAS/434/1681doi:10.26093/cds/vizier.74341681CDSCarrera R.Pancino E.Gallart C.Del Pino A.2026-01-13T20:25:04Z2014-09-29T11:13:30ZCDS support team

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

cds-question@unistra.fropen-star-clustersglobular-star-clusterslate-type-starsline-intensitiesradial-velocityWe extend our previous calibration of the infrared CaII triplet (CaT) as a metallicity indicator to the metal-poor regime by including observations of 55 field stars with [Fe/H] down to -4.0dex. While we previously solved the saturation at high metallicity using a combination of a Lorentzian and a Gaussian to reproduce the line profiles, in this paper we address the non-linearity at low metallicity following the suggestion of Starkenburg et al. of adding two non-linear terms to the relation among the [Fe/H], luminosity and strength of the calcium triplet lines. Our calibration thus extends from -4.0 to +0.5 in metallicity and is presented using four different luminosity indicators: V-V_HB_, M_V_, M_I_ and M_K_. The calibration obtained in this paper results in a tight correlation between [Fe/H] abundances measured from high-resolution spectra and [Fe/H] values derived from the CaT, over the whole metallicity range covered.2013MNRAS.434.1681Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/434/1681CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/134/1298 : CaII equivalent widths in 29 Galactic clusters (Carrera+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/434/1681https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/434/1681http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/434/1681https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/434/1681https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/434/1681http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/434/1681GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/434/1681/table1 (Cluster sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/434/1681/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/434/1681/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/434/1681/table1?GETtext/xml+votable180.050000true6.0223292-72.08144440.005555555555555556Cone search capability for table J/MNRAS/434/1681/table2 (Metal-poor star sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/434/1681/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/434/1681/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/434/1681/table2?GETtext/xml+votable180.050000true22.3797131-16.01263750.005555555555555556Cone search capability for table J/MNRAS/434/1681/table3 (Equivalent widths of the three Ca triplet lines for both cluster and field stars in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/434/1681/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/434/1681/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/434/1681/table3?GETtext/xml+votable180.050000true5.5744961-72.10342170.0055555555555555566/2327 4078 4298 5226 6051 6058 6792 7456 7710 7767 8228 8244 8328 8766 8864 10430 10476 11197 11543 12405 14175 14573 14575 14752 16647 17420 17664 21017 21719 22216 22600 22887 23118 23304 23745 24491 24843 24999 25595 25639 25641 25753 25785 25836 26183 26208 26214 26292 26344 26347 26366 26457 26886 26995 27021 27091 27763 27796 28054 28540 28778 30215 31377 31451 31585 31757 32468 33321 33330 34242 36705 36789 38465 39129 39131 39642 40222 40959 41852 42278 47868 48798 488243.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/434/1681?format=asciidefaultJ/MNRAS/434/1681/table1Cluster samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharSimbadSimbad column added by the CDSmeta.ref.urlcharN*Number of stars in this cluster having Ca tripet equivalent widths (table3)meta.numberintONameOther namemeta.idchar[Fe/H][-2.4/0.5] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]? rms uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloatnullabler_[Fe/H]Reference, in refs.dat filemeta.refchar[Ca/H][-2.1/0.4]? Abundance [Ca/H]log(Sun)phys.abundfloatnullablee_[Ca/H]? rms uncertainty on [Ca/H]log(Sun)stat.error;phys.abundfloatnullable[Fe/H]I[-2.2/0.5]? Metallicity from Paper Ilog(Sun)phys.abund.Fefloatnullablee_[Fe/H]I? rms uncertainty on [Fe/H]Ilog(Sun)stat.error;phys.abund.FefloatnullableAge[0.2/13] AgeGyrtime.agefloate_Agerms uncertainty on AgeGyrstat.error;time.agefloat(m-M)VDistance modulusmagphot.mag.distModfloatE(B-V)Redenningmagphot.color.excessfloatr_E(B-V)Reference, in refs.dat filemeta.ref;pos.framechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/434/1681/table2Metal-poor star sampleSimbadNameSimbad column added by the CDSmeta.idnullableNameStar name \linkRole{equivalent width of the Ca triplet (table3)}meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffEffective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloat[Fe/H][-3.9/-0.1] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[Ca/H][-4.0/-0.2] Abundance [Ca/H]log(Sun)phys.abundfloate_[Ca/H]rms uncertainty on [Ca/H]log(Sun)stat.error;phys.abundfloatRefReference (1)meta.ref;pos.frameintVmagV magnitudemagphot.mag;em.opt.VfloatVMAGAbsolute V magnitudemagphys.magAbsfloate_VMAGrms uncertainty on VMAGmagstat.errorfloatIMAGAbsolute I magnitudemagphys.magAbsfloate_IMAGrms uncertainty on IMAGmagstat.errorfloatKMAGAbsolute K magnitudemagphys.magAbsfloate_KMAGrms uncertainty on KMAGmagstat.errorfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricinte_RVrms uncertainty on RVkm/sstat.errorintS/N[24/144] Signal to noise ratiostat.snrfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/434/1681/table3Equivalent widths of the three Ca triplet lines for both cluster and field stars in our sampleSimbadNameSimbad column added by the CDSmeta.idnullablepmeta.ref.urlchare_W8498rms uncertainty on W84980.1nmstat.errorfloatW8542Equivalent width of CaII triplet line at 8542{AA}0.1nmspect.line.eqWidthfloate_W8542rms uncertainty on W85420.1nmstat.errorfloatW8662Equivalent width of CaII triplet line at 8662{AA}0.1nmspect.line.eqWidthfloate_W8662rms uncertainty on W86620.1nmstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryW8498Equivalent width of CaII triplet line at 8498{AA}0.1nmspect.line.eqWidthfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/MNRAS/434/1681/refsReferencesRefReference numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar