J/MNRAS/435/952ivo://CDS.VizieR/J/MNRAS/435/952doi:10.26093/cds/vizier.74350952CDSSansom A.E.de Castro Milone A.Vazdekis A.Sanchez-Blazquez P.2024-08-06T20:17:27Z2014-10-20T09:13:05ZCDS support team

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

cds-question@unistra.frspectroscopychemical-abundancesA method that is widely used to analyse stellar populations in galaxies is to apply the theoretically derived responses of stellar spectra and line indices to element abundance variations, which are hereafter referred to as response functions. These are applied in a differential way, to base models, in order to generate spectra or indices with different abundance patterns. In this paper, sets of such response functions for three different stellar evolutionary stages are tested with new empirical [Mg/Fe] abundance data for the medium-resolution Isaac Newton Telescope library of empirical spectra (MILES). Recent theoretical models and observations are used to investigate the effects of [Fe/H], [Mg/H] and overall [Z/H] on spectra, via ratios of spectra for similar stars. The global effects of changes in abundance patterns are investigated empirically through direct comparisons of similar stars from MILES, highlighting the impact of abundance effects in the blue part of the spectrum, particularly for lower temperature stars. It is found that the relative behaviour of iron-sensitive line indices are generally well predicted by response functions, whereas Balmer line indices are not. Other indices tend to show large scatter about the predicted mean relations. Implications for element abundance and age studies in stellar populations are discussed and ways forward are suggested to improve the match with the behaviour of spectra and line-strength indices observed in real stars.2013MNRAS.435..952Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/435/952CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/435/952https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/435/952http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/435/952https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/435/952https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/435/952http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/435/952GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/435/952/tablea1 (Tables of data for stars corresponding to the base model Teff and log(g) values in Korn et al., 2005A&A...438..685K, for cool dwarfs, turn-off stars and cool giants, from a 5Gyr old population)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/435/952/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/435/952/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/435/952/tablea1?GETtext/xml+votable180.050000true75.2041658-5.7536750.0055555555555555566/433 1715 2472 2524 4184 4298 4376 5718 5985 8348 8476 10359 10504 11929 12056 13725 14180 14298 14385 14630 15118 16192 17695 19323 19585 20446 21941 22180 22818 24777 24951 25015 26975 27075 27198 27431 28494 29196 29533 30220 31048 32192 32458 36735 36762 40095 40567 40959 44260 44284 44931https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/435/952?format=asciiOpticaldefaultJ/MNRAS/435/952/tablea1Tables of data for stars corresponding to the base model Teff and log(g) values in Korn et al., 2005A&A...438..685K, for cool dwarfs, turn-off stars and cool giants, from a 5Gyr old populationNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintModModel: CD, TO or CG (1)stat.param;meta.modelledcharNo[1/31] Sequential number within the modelmeta.recordintTeff[4159/6298] Effective temperatureKphys.temperature.effectiveintlogg[1.7/4.7] Surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-2.9/0.5] Metallicitylog(Sun)phys.abund.Zfloat[Mg/Fe][-0.4/0.6] Abundance [Mg/Fe]log(Sun)phys.abundfloatMMILES (Medium-resolution Isaac Newton Telescope Library) star identifiermeta.id.associntHdAH{delta}A Lick index0.1nmspect.indexfloatHdFH{delta}F Lick index0.1nmspect.indexfloatCN1CN1 Lick index0.1nmmeta.code;spect.indexfloatCN2CN_2 Lick index0.1nmmeta.code;spect.indexfloatCa4227Ca4227 Lick index0.1nmmeta.code;spect.indexfloatG4300G4300 Lick index0.1nmmeta.code;spect.indexfloatHgAH{gamma}A Lick index0.1nmspect.index;em.line.HgammafloatHgFH{gamma}F Lick index0.1nmspect.index;em.line.HgammafloatFe4383Fe4383 Lick index0.1nmmeta.code;spect.indexfloatCa4455Ca4455 Lick index0.1nmmeta.code;spect.indexfloatFe4531Fe4531 Lick index0.1nmmeta.code;spect.indexfloatC2-4668C_2_4668 Lick index0.1nmspect.indexfloatHbH{beta} Lick index0.1nmspect.index;em.line.HbetafloatFe5015Fe5051 Lick index0.1nmmeta.code;spect.indexfloatMg1Mg_1_ Lick indexmagspect.indexfloatMg2Mg_2_ Lick indexmagspect.indexfloatMgbMg_b_ Lick index0.1nmmeta.code;spect.indexfloatFe5270Fe5270 Lick index0.1nmmeta.code;spect.indexfloatFe5335Fe5335 Lick index0.1nmmeta.code;spect.indexfloatFe5406Fe5406 Lick index0.1nmmeta.code;spect.indexfloatFe5709Fe5709 Lick index0.1nmmeta.code;spect.indexfloatFe5782Fe5782 Lick index0.1nmmeta.code;spect.indexfloatNaDNaD Lick index0.1nmmeta.code;spect.indexfloatTiO1TiO_1_ Lick index0.1nmmeta.code;spect.indexfloatTiO2TiO_2_ Lick index0.1nmmeta.code;spect.indexfloatSimbadNameSimbad column added by the CDSmeta.idchar_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.main