J/AJ/112/171ivo://CDS.VizieR/J/AJ/112/171doi:10.26093/cds/vizier.51120171CDSSadler E.M.Rich R.M.Terndrup D.M.2023-04-06T16:50:21Z1997-12-09T20:36:49ZCDS support team

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

cds-question@unistra.frgiant-starsapparent-magnitudemetallicityeffective-temperatureThis is the second in a series of papers in which we analyze spectra of over 400 K and M giants in Baade's Window, including most of the stars with proper motions measured by Spaenhauer et al. (1992AJ....103..297S). In our first paper, we measured line-strength indices of Fe, Mg, CN, and HBeta and calibrated them on the system of Faber et al. (1985ApJS...57..711F). Here, we use the <Fe> index to derive an abundance distribution of [Fe/H] for 322 stars with effective temperatures between 3900K and 5160K. Our derived values of [Fe/H] agree well with those measured from high-resolution echelle spectra (e.g., McWilliam & Rich, 1994ApJS...91..749M) for the small number of stars in common. We find a mean abundance <[Fe/H]>=-0.11+/-0.04 for our sample of Baade's Window K giants. More than half the sample lie in the range -0.4<[Fe/H]<+0.3. We estimate line-of-sight distances for individual stars in our sample and confirm that, in Baade's Window, most K giants with V<15.5 are foreground disk stars, but the great majority (more than 80%) with V>16 belong to the bulge. We also compare the metallicities derived from the CN and Mg2 indices to those from iron. Most of the metal-rich stars in our sample appear to be CN-weak, in contrast to the situation in metal-rich globular clusters and elliptical galaxies. The metal-poor half of our sample ([Fe/H]<0) shows evidence for a mild Mg overenhancement ([Mg/Fe]~+0.2); but this is not seen in the more metal-rich stars ([Fe/H]>=0). The K giants in Baade's Window therefore share some, but not all, of the characteristics of stars in elliptical galaxies as inferred from their integrated light.1996AJ....112..171Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/112/171CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/110/1774 : K giants in Baade's window. I. (Terndrup+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/112/171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/112/171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/112/171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/112/171https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/112/171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/112/171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/112/171/table1Measurements of [Fe/H] for Baade's Window K giantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveint[Fe/H]Metallicity, [Fe/H]Sunphys.abund.Fefloate_[Fe/H]Error in [Fe/H]stat.errorfloatRDistancekpcpos.distancefloate_RError in Rkpcstat.errorfloatClass*[CBDH] Star classificationsrc.classcharVmagV magnitudemagphot.mag;em.opt.VfloatV-IV-I colormagphot.color;em.opt.V;em.opt.Ifloat