J/ApJ/530/783ivo://CDS.VizieR/J/ApJ/530/783doi:10.26093/cds/vizier.15300783CDSWestin J.Sneden C.Gustafsson B.Cowan J.J.2002-07-20T22:28:21Z2002-07-20T22:28:16ZCDS support team

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

cds-question@unistra.frspectroscopypopulation-ii-starsNew high-resolution, very high signal-to-noise spectra of ultrametal-poor (UMP) giant stars HD 115444 and HD 122563 have been gathered with the High-Resolution Echelle Spectrometer of the McDonald Observatory 2.7 m telescope. With these spectra, line identification and model atmosphere analyses have been conducted, emphasizing the neutron-capture elements. Twenty elements with Z > 30 have been identified in the spectrum of HD 115444. This star is known to have overabundances of the neutron-capture elements, but it has lacked a detailed analysis necessary to compare with nucleosynthesis predictions. The new study features a line-by-line differential abundance comparison of HD 115444 with the bright, well-studied halo giant HD 122563.2000ApJ...530..783Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/530/783CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/300/751 : Metal-poor stars spectroscopy. II (Axer+, 1995)J/A+A/287/927 : Abundances for lines of n-capture in 19 stars (Gratton+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/530/783https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/530/783http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/530/783https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/530/783https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/530/783http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/530/783GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/530/783/table2Equivalent widths of observed starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWave? Wavelength of line0.1nmem.wlfloatnullableIonObserved ion line or molecular bandphys.atmol.ionizationcharExPot? Excitation potential of the ioneVphys.energy;phys.atmol.excitationfloatnullablelog(gf)? Log of the oscillator strengthphys.atmol.wOscStrengthfloatnullableEqW122? Equivalent Width of HD 1225630.1nmspect.line.eqWidthfloatnullablef_EqW122Flag indicating line analyzed with synthetic spectrameta.code.errorcharEqW115? Equivalent Width of HD 1154440.1nmspect.line.eqWidthfloatnullablef_EqW115Flag indicating line analyzed with synthetic spectrameta.code.errorchar