J/ApJS/216/1ivo://CDS.VizieR/J/ApJS/216/1doi:10.26093/cds/vizier.22160001CDSPeterson R.C.Kurucz R.L.2017-12-22T05:32:49Z2015-03-02T12:36:38ZCDS support team

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

cds-question@unistra.fratomic-physicsspectroscopyThe spectrum of the Fe I atom is critical to many areas of astrophysics and beyond. Measurements of the energies of its high-lying levels remain woefully incomplete, however, despite extensive laboratory and solar analysis. In this work, we use high-resolution archival absorption-line ultraviolet and optical spectra of stars whose warm temperatures favor moderate Fe I excitation. We derive the energy for a particular upper level in Kurucz's semiempirical calculations by adopting a trial value that yields the same wavelength for a given line predicted to be about as strong as that of a strong unidentified spectral line observed in the stellar spectra, then checking the new wavelengths of other strong predicted transitions that share the same upper level for coincidence with other strong observed unidentified lines. To date, this analysis has provided the upper energies of 66 Fe I levels. Many new energy levels are higher than those accessible to laboratory experiments; several exceed the Fe I ionization energy. These levels provide new identifications for over 2000 potentially detectable lines. Almost all of the new levels of odd parity include UV lines that were detected but unclassified in laboratory Fe I absorption spectra, providing an external check on the energy values. We motivate and present the procedure, provide the resulting new energy levels and their uncertainties, list all the potentially detectable UV and optical new Fe I line identifications and their gf values, point out new lines of astrophysical interest, and discuss the prospects for additional Fe I energy level determinations.2015ApJS..216....1Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/216/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/215/23 : FeI radiative lifetimes (Den Hartog+, 2014)J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/A+A/554/A132 : Iron line list (FeI and FeII) (Genovali+, 2013)J/A+A/547/A108 : Comparative modelling of giants spectra (Lebzelter+, 2012)J/A+A/538/A143 : Atmospheric param. of stars for UV models (Koleva+, 2012)J/ApJ/743/140 : Abundances in metal-poor stars (Boesgaard+, 2011)J/A+A/520/A57 : New FeII energy levels from star spectra (Castelli+, 2010)J/ApJS/187/149 : StarCAT: STIS UV echelle spectra of stars (Ayres, 2010)J/ApJS/94/221 : New multiplet table for FeI (Nave+, 1994)J/A+AS/102/269 : Lab. and solar highly-excited levels of Fe I (Nave+ 1993)J/A+A/274/555 : FeI lines asymmetry in solar spectrum (Stathopoulou+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/216/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/216/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/216/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/216/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/216/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/216/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/216/1/table1 (Stellar parameters and spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/216/1/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/216/1/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/216/1/table1?GETtext/xml+votable180.050000true6/4574 8767 14534 18821 21833 23540 28336 31751 32473 40716 42331 44542 45353https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/216/1?format=asciiOpticaldefaultJ/ApJS/216/1/table2New FeI levels and energiesJ[0/6] J valuephys.atmol.qnintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPParity level (e=even or o=odd)phys.atmol.parity;phys.atmol.levelcharExpLevelExpanded label (1)phys.atmol.configurationcharLevelAbbreviated label (1)phys.atmol.configurationcharE[38602/67717] Energycm**-1phys.energy;phys.atmol.leveldoublee_E[0.01/0.1] 1{sigma} uncertainty in wavenumbercm**-1stat.errorfloatJ/ApJS/216/1/table3Newly classified lines of FeIJ.e[0/6] Even level Jphys.atmol.qnfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlamAir[160.5/898.2] Wavelength in air; vacuum below 200nmnmem.wl;phys.atmol.transitiondoublelog(gf)[-4/0.4] Log of calculated oscillator strength times statistical weight of lower level (1)phys.absorption.coeff;arith.zpfloatdgf[-1.4/0.9]? difference of log(gf) which best matches the observed spectra - log(gf)stat.fit.residualfloatnullableE.e[0/67717] Even level energycm**-1phys.energy;phys.atmol.leveldoubleLabel.eEven level labelphys.atmol.configurationcharE.o[19350/62885] Odd level energycm**-1phys.energy;phys.atmol.leveldoubleJ.o[0/7] Odd level Jphys.atmol.qnfloatLabel.oOdd level labelphys.atmol.configurationcharGam.R[6.8/8.9] Log radiative damping constantphys.atmol.dampingfloatGam.SLog Stark damping constant/electron density cm-3phys.atmol.dampingfloatGam.WLog van der Waals damping constant/H density cm-3phys.atmol.dampingfloatJ/ApJS/216/1/table1Stellar parameters and spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar name or model ID (Teff logg [Fe/H])meta.id;meta.maincharANameAlternative star name(s)meta.idlambda1Lower range of wavelength in {AA}0.1nminstr.bandwidthintlambda2Upper range of wavelength in {AA}0.1nminstr.bandwidthintInstTelescope and InstrumentinstrcharProgProgrammeta.notecharRedReduction method (1)meta.notecharTexp[0.01/63]? Exposure timekstime.duration;obs.exposurefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable