J/ApJS/228/10ivo://CDS.VizieR/J/ApJS/228/10doi:10.26093/cds/vizier.22280010CDSLawler J.E.Sneden C.Nave G.Den Hartog E.A.Emrahoglu N.Cowan J.J.2017-05-22T15:35:46Z2017-04-13T09:42:51ZCDS support team

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

cds-question@unistra.fratomic-physicsNew emission branching fraction (BF) measurements for 183 lines of the second spectrum of chromium (Cr II) and new radiative lifetime measurements from laser-induced fluorescence for 8 levels of Cr^+^ are reported. The goals of this study are to improve transition probability measurements in Cr II and reconcile solar and stellar Cr abundance values based on Cr I and Cr II lines. Eighteen spectra from three Fourier Transform Spectrometers supplemented with ultraviolet spectra from a high-resolution echelle spectrometer are used in the BF measurements. Radiative lifetimes from this study and earlier publications are used to convert the BFs into absolute transition probabilities. These new laboratory data are applied to determine the Cr abundance log{epsilon} in the Sun and metal-poor star HD 84937. The mean result in the Sun is <log{epsilon}(CrII)>=5.624+/-0.009 compared to <log{epsilon}(CrI)>=5.644+/-0.006 on a scale with the hydrogen abundance log{epsilon}(H)=12 and with the uncertainty representing only line-to-line scatter. A Saha (ionization balance) test on the photosphere of HD 84937 is also performed, yielding <log{epsilon}(CrII)>=3.417+/-0.006 and <log{epsilon}(CrI, lower level excitation potential E.P.>0eV)>=3.374+/-0.011 for this dwarf star. We find a correlation of Cr with the iron-peak element Ti, suggesting an associated nucleosynthetic production. Four iron-peak elements (Cr along with Ti, V, and Sc) appear to have a similar (or correlated) production history-other iron-peak elements appear not to be associated with Cr.2017ApJS..228...10Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/228/10CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/817/53 : Fe-group elemental analysis in HD84937 (Sneden+, 2016)J/ApJS/220/13 : Co I transition probabilities (Lawler+, 2015)J/ApJS/215/20 : Vanadium log(gf) and transition probabilities (Lawler+, 2014)J/ApJS/214/18 : VII log(gf) values, and V abundance in HD 84937 (Wood+ 2014)J/ApJS/213/28 : Spectrum analysis of CrII (Sansonetti+, 2014)J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/A+A/554/A96 : Spectra of LiI(670.8nm) line in metal-poor stars (Lind+, 2013)J/A+A/511/A68 : Transitions of CrII (Gurell+, 2010)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/228/10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/228/10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/228/10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/228/10https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/228/10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/228/10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJS/228/10/table4Experimental atomic transition probabilities for 183 lines of Cr II organized by increasing wavelength in airrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlamAir[253.4/642.2] Wavelength in air (1)nmem.wl;phys.atmol.transitiondoubleUpLev[46823.3/54784.5] Upper level Value (2)cm**-1stat.value;phys.atmol.leveldoubleUpJ[0.5/5.5] Upper level J value (2)phys.atmol.qnfloatLowLev[11961.7/38269.6] Lower level Value (2)cm**-1stat.value;phys.atmol.leveldoubleLowJ[0.5/5.5] Lower level J value (2)phys.atmol.qnfloatA[0.05/250] Transition probability1e+06s**-1phys.atmol.transProbfloate_A[0.01/11] Total uncertainty in A1e+06s**-1stat.errorfloatlog(gf)[-3/0.6] Log of degeneracy times oscillator strengthphys.atmol.oscStrengthfloat