J/MNRAS/406/165ivo://CDS.VizieR/J/MNRAS/406/165doi:10.26093/cds/vizier.74060165CDSJohansson J.Thomas D.Maraston C.2024-07-11T20:17:03Z2011-01-21T09:34:01ZCDS support team

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

cds-question@unistra.frspectroscopyastronomical-modelsStellar population models of absorption-line indices are an important tool for the analysis of stellar population spectra. They are most accurately modelled through empirical calibrations of absorption-line indices with the stellar parameters such as effective temperature, metallicity and surface gravity, which are the so-called fitting functions. Here we present new empirical fitting functions for the 25 optical Lick absorption-line indices based on the new stellar library Medium resolution INT Library of Empirical Spectra (MILES). The major improvements with respect to the Lick/IDS library are the better sampling of stellar parameter space, a generally higher signal-to-noise ratio and a careful flux calibration. In fact, we find that errors on individual index measurements in MILES are considerably smaller than in Lick/IDS. Instead, we find the rms of the residuals between the final fitting functions and the data to be dominated by errors in the stellar parameters. We provide fitting functions for both Lick/IDS and MILES spectral resolutions and compare our results with other fitting functions in the literature.2010MNRAS.406..165Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/406/165CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/116/1 : Old Stellar Populations. VI. Absorption-Line (Trager+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/406/165https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/406/165http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/406/165https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/406/165https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/406/165http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/406/165GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/406/165/table1Typical Lick index errors and offsets to the Lick/IDS libraryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndexIndex numbermeta.idintNameIndex namespect.indexsigMIndex error at the resolution of the MILES librarystat.errorfloatsigLIndex error at the resolution of the Lick/IDS librarystat.errorfloatsigT98Index error presented in Trager et al. (1998, Cat. J/ApJS/116/1) for the Lick/IDS librarystat.errorfloataMMILES a coefficient (1)stat.fit.paramfloatbMMILES b coefficient (1)stat.fit.paramfloataEELODIE a coefficient (1)stat.fit.paramfloatbEELODIE b coefficient (1)stat.fit.paramfloataSSTELIB a coefficient (1)stat.fit.paramfloatbSSTELIB b coefficient (1)stat.fit.paramfloat