J/A+A/425/671ivo://CDS.VizieR/J/A+A/425/671doi:10.26093/cds/vizier.34250671CDSBai G.S.Zhao G.Chen Y.Q.Shi J.R.Klochkova V.G.Panchuk V.E.,Qiu H.M.Zhang H.W.2017-10-18T08:24:03Z2004-11-21T21:04:21ZCDS support team

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

cds-question@unistra.frpopulation-ii-starschemically-peculiar-starsline-intensitiesWe presented the observed information of ten metal-poor halo stars with the metallicity range -2.3<[Fe/H]< -1.4 and derived their stellar parameters, acquired some elemental abundances relative to iron and discussed the relation between the abundance ratio and the metallicity. The stars were observed using the 6m telescope of the Special Astrophysical Observatory with the ECHELLE spectrometer PFES equipped with the CCD (1040x1160 pixels, pixel size 16x16{mu}m). The spectral wavelength coverage is of 430-798nm with the resolving power of 15000 and the signal-to-noise ratio is about 200. It was found that oxygen abundances are nearly constant at a level of 0.6dex for our metal-poor halo stars when the non-LTE correction is considered. The alpha-elements (Mg, Si, Ca and Ti) are overabundant relative to Fe and decrease with increasing metallicity. We also obtained a significant underabundant non-LTE [Na/Fe] ratio from NaI D lines which have large deviation from LTE assumption. Scandium is marginally overabundant with respect to iron and tends to decrease with increasing metallicity like the alpha-elements. Nearly solar value of [Cr/Fe] ratio and underabundant [Mn/Fe] ratio are obtained.2004A&A...425..671Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/425/671CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/425/671https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/425/671http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/425/671https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/425/671https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/425/671http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/425/671GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/425/671/stars (Star positions and magnitudes (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/425/671/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/425/671/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/425/671/stars?GETtext/xml+votable180.050000true186.3954171.2838890.0055555555555555566/5195 5622 9004 9831 10359 26289 28154 30939 31094 32343https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/425/671?format=asciiOpticaldefaultJ/A+A/425/671/starsStar positions and magnitudes (from Simbad)NameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmag? B magnitudemagphot.mag;em.opt.BfloatnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableSpTypeSpectral typesrc.spTypecharObsDateObservation Datetime.epochnullableEWDisplay the equivalent width for this starmeta.refcharSimbadSimbad column added by the CDSmeta.refcharJ/A+A/425/671/ewlineAtomic line data and equivalent widthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLambdaWavelength0.1nmem.wldoubleIonSpecie name and ionizationphys.atmol.elementcharEPExcitation potentialeVphys.energy;phys.atmol.excitationfloatloggflog of Oscillator Strengthphys.atmol.wOscStrengthfloatf6Enhancement factorphys.damping;phys.atmolfloatEW1? Equivalent width for HD 1081770.1pmspect.line.eqWidthfloatnullableEW2? Equivalent width for HD 1494140.1pmspect.line.eqWidthfloatnullableEW3? Equivalent width for BD+02 33750.1pmspect.line.eqWidthfloatnullableEW4? Equivalent width for BD+20 36030.1pmspect.line.eqWidthfloatnullableEW5? Equivalent width for BD+26 26060.1pmspect.line.eqWidthfloatnullableEW6? Equivalent width for BD+28 21370.1pmspect.line.eqWidthfloatnullableEW7? Equivalent width for BD+29 20910.1pmspect.line.eqWidthfloatnullableEW8? Equivalent width for BD+34 24760.1pmspect.line.eqWidthfloatnullableEW9? Equivalent width for BD+42 26670.1pmspect.line.eqWidthfloatnullableEW10? Equivalent width for BD+51 16960.1pmspect.line.eqWidthfloatnullable