J/A+AS/147/111ivo://CDS.VizieR/J/A+AS/147/111CDSChen G.-X.Pradhan A.K.2002-08-10T15:55:21Z2002-08-10T15:55:06ZCDS support team

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

cds-question@unistra.fratomic-physicsplanetary-nebulaeRelativistic atomic structure calculations for electric dipole (E1), electric quadrupole (E2) and magnetic dipole (M1) transition probabilities among the first 80 fine-structure levels of Fe VI, dominated by configurations 3d^3^, 3d^2^4s, and 3d^2^4p, are carried out using the Breit-Pauli version of the code SUPERSTRUCTURE. Experimental energies are used to improve the accuracy of these transition probabilities. Employing the 80-level collision-radiative (CR) model with these dipole and forbidden transition probabilities, and Iron Project R-matrix collisional data, we present a number of [Fe VI] line ratios applicable to spectral diagnostics of photoionized H II regions. It is shown that continuum fluorescent excitation needs to be considered in CR models in order to interpret the observed line ratios of optical [Fe VI] lines in planetary nebulae NGC 6741, IC 351, and NGC 7662. The analysis leads to parametrization of line ratios as function of, and as constraints on, the electron density and temperature, as well as the effective radiation temperature of the central source and a geometrical dilution factor. The spectral diagnostics may also help ascertain observational uncertainties. The method may be generally applicable to other objects with intensive background radiation fields, such as novae and active galactic nuclei. The extensive new Iron Project radiative and collisional calculations enable a consistent analysis of many line ratios for the complex iron ions.2000A&AS..147..111Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/147/111CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/74 : Atomic Energy Level Data (NIST 1993)J/A+AS/103/273 : IRON Project II IR collision strengths of C-like ionsJ/A+A/283/319 : IRON Project III B-like ionsJ/A+AS/108/1 : IRON Project V Collision strengths of O-like ionsJ/A+A/293/953 : IRON Project VI Fe II collision strengthsJ/A+A/293/967 : IRON Project VII Fe II radiative transitionsJ/A+AS/109/193 : IRON Project VIII Electron excitation of Ti-like ionsJ/A+AS/119/509 : IRON Project XVII Radiative transition in Fe IIIJ/A+AS/119/523 : IRON Project XVIII Electron impact for Fe IIIJ/A+AS/120/361 : IRON Project XIX Fe II radiative transitionsJ/A+AS/123/159 : IRON Project XXII C and O radiative ratesJ/A+AS/123/575 : IRON Project XXIII Fe XXII excitation rate coefficientsJ/A+AS/126/373 : IRON Project XXVII Fe IV collision strengthsJ/A+AS/131/499 : IRON Project XXIX Boron isoelectronic sequenceJ/A+AS/131/153 : IRON Project XXXI Fe XII electron excitationJ/A+AS/135/347 : IRON Project XXXV Fe XXIV & Fe XXV oscillator strengthsJ/A+AS/136/395 : IRON Project XXXVII Fe VI collision strengthsJ/A+AS/137/165 : IRON Project XXXVIII Fe XV fine-structure transitionsJ/A+AS/143/483 : IRON Project XLII Fe XXI electron impact excitationJ/A+AS/144/141 : IRON Project XLIII Fe V transition probabilitiesJ/A+AS/147/253 : IRON Project XLV Ar XIII, Fe XXI trans. probabilitiesJ/A+A/365/268 : IRON Project XLVII Ni III electron impact excitationJ/A+A/372/1078 : IRON Project XLIX Fe XX electron impact excitationJ/A+A/372/1083 : IRON Project L Fe XIX electron impact excitationJ/A+A/394/753 : IRON Project LI Fe IX electron impact excitationJ/A+A/408/789 : IRON Project LIII Fe XVII transition probabilitiesJ/A+A/413/779 : IRON Project LIV Fe XX transition probabilitiesJ/A+A/420/763 : IRON Project LV Ni II electron impact excitationJ/A+A/437/345 : IRON Project LIX Fe IV transition probabilitiJ/A+A/448/779 : IRON Project LXI Fe IV radiative transitionsJ/A+A/457/721 : IRON Project LXII Fe XVIII allowed and forbidden trans.J/A+A/466/763 : IRON Project LXIII Fe^19+^ electron impact excitationhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/147/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/147/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/147/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/147/111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/147/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/147/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+AS/147/111/table1The 80 fine structure levels corresponding to the 34 LS terms included in the calculations and their observed energies (Ry) in Fe VI (Sugar & Corliss, 1985, Cat. <VI/74>)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiInitial levelmeta.idintTermLS termphys.atmol.configuration2JFinal 2J levelphys.atmol.qnintEObserved energy (Sugar & Corliss, 1985, Cat. <VI/74>)Ryphys.energy;phys.atmol.leveldoubleJ/A+AS/147/111/table3Comparison of the electric quadrupole (E2) and magnetic dipole (M1) transition probabilities between the first 19 levels of Fe VI in s^-1^ among the present calculation by SUPERSTRUCTURE, calculations by Garstang et al. (1978ApJ...222..384G) and by NussbarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintii Transitionmeta.idintjj Transitionmeta.idintE2Present electric quadrupole transition probabilitys**-1phys.atmol.transProbdoubleM1Present magnetic dipole transition probabilitys**-1phys.atmol.transProbdoubleE2G? Garstang et al. (1978ApJ...222..384G) electric quadrupole transition probabilitys**-1phys.atmol.transProbdoublenullableM1G? Garstang et al. (1978ApJ...222..384G) magnetic dipole transition probabilitys**-1phys.atmol.transProbdoublenullableE2N? Nussbaumer & Storey (1978A&A....70...37N) electric quadrupole transition probabilitys**-1phys.atmol.transProbdoublenullableM1N? Nussbaumer & Storey (1978A&A....70...37N) magnetic dipole transition probabilitys**-1phys.atmol.transProbdoublenullableJ/A+AS/147/111/table4Electric quadrupole (E2) and magnetic dipole (M1) transition probabilities between the first 80 levels of Fe VI in s^-1^ in the present calculation by SUPERSTRUCTURE.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiInitial levelmeta.idintjFinal levelmeta.idintE2Electric quadrupole transition probabilitys**-1phys.atmol.transProbdoubleM1Magnetic dipole transition probabilitys**-1phys.atmol.transProbdoubleJ/A+AS/147/111/table6Line intensity ratios for transitions relative to {lambda}5146{AA} (8-3: ^4^F_7/2_-^2^G_7/2_), with T_eff_=150000K.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiInitial levelmeta.idintjFinal levelmeta.idintlambdaWavelengthnmem.wl;phys.atmol.transitionfloatFLE[ABCDEO] Note on fluorescent excitation (1)meta.codecharLIR1? Te=10000K, ne=10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR2? Te=10000K, ne=10^4^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR3? Te=20000K, ne=10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR4? Te=20000K, ne=10^4^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR5? Te=12000K, ne=2x10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR6? Te=12000K, ne=6x10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR7? Te=12000K, ne=10^4^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR8? Te=16000K, ne=2x10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR9? Te=16000K, ne=6x10^3^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR10? Te=16000K, ne=10^4^cm-3 line intensity ratiospect.line.intensity;arith.ratiodoublenullableLIR11? Line intensity ratio from r_LIR11spect.line.intensity;arith.ratiodoublenullabler_LIR11[a-f] Reference for LIR11 (2)meta.refcharJ/A+AS/147/111/table2Weighted dipole allowed E1 oscillator strengths gf_L_, gf_V_ in the length and velocity formulations, and the Einstein A-coefficients A_L_ in the length formulation.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiInitial levelmeta.idintjFinal levelmeta.idintgfLE1 oscillator strength in the length formulationphys.atmol.wOscStrengthdoublegfVE1 oscillator strength in the velocity formulationphys.atmol.wOscStrengthdoubleALEinstein A-coefficient in the length formulations**-1phys.atmol.transProbdouble