J/AJ/149/121ivo://CDS.VizieR/J/AJ/149/121doi:10.26093/cds/vizier.51490121CDSLee-Brown D.B.Anthony-Twarog B.J.Deliyannis C.P.Rich E.Twarog B.A.2019-05-08T15:00:56Z2015-05-20T13:02:23ZCDS support team

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

cds-question@unistra.fropen-star-clusterseffective-temperatureradial-velocitychemical-abundancesHigh-dispersion spectra of 333 stars in the open cluster NGC 6819, obtained using the HYDRA spectrograph on the WIYN 3.5m telescope, have been analyzed to determine the abundances of iron and other metals from lines in the 400{AA} region surrounding the Li6708{AA} line. Our spectra, with signal-to-noise per pixel ranging from 60 to 300, span the luminosity range from the tip of the red giant branch to a point two magnitudes below the top of the cluster turnoff. We derive radial and rotational velocities for all stars, as well as [Fe/H] based on 17 iron lines, [Ca/H], [Si/H], and [Ni/H] in the 247 most probable, single members of the cluster. Input T_eff_ estimates for model atmosphere analysis are provided by (B-V) colors merged from several sources, with individual reddening corrections applied to each star relative to a cluster mean of E(B-V)=0.16. Extensive use is made of ROBOSPECT, an automatic equivalent width measurement program; its effectiveness on large spectroscopic samples is discussed. From the sample of likely single members, [Fe/H]=-0.03+/-0.06, where the error describes the median absolute deviation about the sample median value, leading to internal precision for the cluster below 0.01dex. The final uncertainty in the cluster abundance is therefore dominated by external systematics due to the temperature scale, surface gravity, and microturbulent velocity, leading to [Fe/H]=-0.02+/-0.02 for a sub-sample restricted to main sequence and turnoff stars. This result is consistent with our recent intermediate-band photometric determination of a slightly subsolar abundance for this cluster. [Ca/Fe], [Si/Fe], and [Ni/Fe] are determined to be solar within the uncertainties. NGC 6819 has an abundance distribution typical of solar metallicity thin disk stars in the solar neighborhood.2015AJ....149..121Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/121CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/148/38 : WIYN open cluster study. LX. RV in NGC 6819 (Milliman+, 2014)J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)J/AJ/121/327 : Metal Abundances of Red Clump Stars in NGC 6819https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/121https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/121http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/121https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/121https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/121http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/121GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/121/stars (Stellar parameters and abundances for stars in the NGC 6819 (tables 1 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/121/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/121/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/121/stars?GETtext/xml+votable180.050000true295.32104166740.1810555560.0055555555555555565/3688https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/121?format=asciidefaultJ/AJ/149/121/starsStellar parameters and abundances for stars in the NGC 6819 (tables 1 and 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWOCS[1002/80025] WIYN Open Cluster Study numbermeta.id;meta.mainintP13? Platais et al. 2013 (cat. J/AJ/146/43) numbermeta.idintnullableMm[0/99]? Cluster membership probabilitystat.probability;meta.code.memberintnullableB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatE(B-V)The E(B-V) reddening estimatemagphot.color.excessfloatNp[1/4] Number of photometric sourcesmeta.number;obsintTeff[3797/7319] Effective temperatureKphys.temperature.effectiveintlogg[1.09/4.37] Log surface gravitylog(cm.s**-2)phys.gravityfloatVt[0.85/2.57] Microturbulent velocitykm/sphys.velocfloatS/N[18/369] Signal-to-Noise per pixelstat.snr;instr.pixelintvsini[4.1/32.2] Rotational velocitykm/sphys.veloc.rotatfloate_vsini[0.1/7.1] 1{sigma} uncertainty in vsinikm/sstat.error;phys.veloc.rotatfloatRV[-16.2/35.4] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.5/4.4] 1{sigma} uncertainty in RVkm/sstat.errorfloatSB1Indicates a single-lined spectroscopic binarymeta.code.status;meta.code.multipchar[Fe/H][-0.75/0.32] Median log of the Fe/H abundancelog(Sun)phys.abund.Fe;stat.medianfloato_[Fe/H][3/32] Number of iron linesmeta.number;em.lineintMAD[0.02/1.04] Median Absolute Deviation (MAD) statistics for each [Fe/H] estimate (1)log(Sun)stat.stdevfloat[Ca/H][-2/0.6]? Log of the Ca/H abundancelog(Sun)phys.abundfloatnullable[Si/H][-0.5/0.52]? Log of the Si/H abundancelog(Sun)phys.abundfloatnullable[Ni/H][-1.6/1]? Log of the Ni/H abundancelog(Sun)phys.abundfloatnullableNMm"NM/BC" Indicates a non-member and/or a binary candidatemeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Hole et al. 2009 (J/AJ/138/159, table2A (right ascension part)degpos.eq.ra;meta.main_DEPositions from Hole et al. 2009 (J/AJ/138/159, table2A (declination part)degpos.eq.dec;meta.main