J/A+AS/139/29ivo://CDS.VizieR/J/A+AS/139/29CDSGorgas J.Cardiel N.Pedraz S.GonzalezJ.J.1999-12-22T21:13:16Z1999-12-22T22:13:11ZCDS support team

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

cds-question@unistra.freffective-temperaturemetallicityEmpirical fitting functions, describing the behaviour of the {lambda}4000{AA} break in terms of effective temperature, metallicity and surface gravity, are presented. For this purpose, the break has been measured in 392 stars from the Lick/IDS Library. We have followed a very detailed error treatment in the reduction and fitting procedures, allowing for a reliable estimation of the break uncertainties. This calibration can be easily incorporated into stellar population models to provide accurate predictions of the break amplitude for, relatively old, composite systems. Table 1 lists the star sample, together with spectral types, adopted atmospheric parameters, break measurements, including errors, and residuals from the fitting functions.1999A&AS..139...29Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/139/29CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/139/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/139/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/139/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/139/29https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/139/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/139/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/139/29/table1Data sample and break measurementsr_[Fe/H]? Source for metallicity (2)intnullableHD? HD (Cat. <III/135>) nameintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSimbadask the SIMBAD data-base about this objectcharm_HDMultiplicity extension of HD numbercharNameAlternative namecharSpTypeSpectral type (1)charTeff? Effective temperatureKintnullabler_Teff? Source for effective temperature (2)intnullablelog(g)? Logarithm of gravitycm.s**-2floatnullabler_log(g)? Source for logarithm of gravity (2)intnullable[Fe/H]? MetallicitySunfloatnullableD40004000 A breakfloate_D4000Error on 4000 A break (3)floatRes? Residual from the fitting functions (4)floatnullableRunsRuns in which the star was observed (5)charCommComments on individual stars (6)char