J/AJ/117/2308ivo://CDS.VizieR/J/AJ/117/2308doi:10.26093/cds/vizier.51172308CDSWilhelm R.Beers T.C.Gray R.O.2023-04-06T16:50:32Z2000-04-12T21:40:48ZCDS support team

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

cds-question@unistra.frmetallicitytwo-color-diagramsline-intensitiesastronomical-modelsstellar-atmosphereshalo-starshorizontal-branch-starsWe discuss a spectroscopic and photometric technique that enables the identification and classification of field horizontal-branch (FHB) and other A-type stars, even from relatively low signal-to-noise ratio medium-resolution spectra. This technique makes use of broadband UBV colors predicted from model atmosphere calculations and Balmer line profiles and Ca II K equivalent widths determined from synthetic spectra to estimate the physical parameters T_eff_, log(g), and [Fe/H] for stars in the effective temperature range 6000 - 10,000 K.1999AJ....117.2308Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/117/2308CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/103/267 : Spectrocopy of hot stars in galactic halo (Beers+ 1992)VI/39 : Model Atmospheres (Kurucz, 1979)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/117/2308https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/117/2308http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/117/2308https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/117/2308https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/117/2308http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/117/2308GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/117/2308/table1Calibration grid from Kurucz model atmospheresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intTempEffective temperature of Kurucz modelKintlog(g)Log of the surface gravity of Kurucz modellog(g.cm**-2)float[Fe/H]Log of the iron abundance relative to hydrogen of Kurucz modellog(Sun)floatB-VPredicted B-V from Kurucz color calibrationsmagfloatU-BPredicted U-B from Kurucz color calibrationsmagfloatEqWCaEquivalent width of the Ca II K line0.1nmfloatEqWH4Equivalent width of H{delta}0.1nmfloatEqWH3Equivalent width of H{gamma}0.1nmfloatDH4Full width at 20% below a local continuum level of H{delta}0.1nmfloatDH3Full width at 20% below a local continuum level of H{gamma}0.1nmfloat