J/MNRAS/368/1959ivo://CDS.VizieR/J/MNRAS/368/1959doi:10.26093/cds/vizier.73681959CDSLiu X.-W.Barlow M.J.Zhang Y.Bastin R.J.Storey P.J.2024-07-02T20:17:22Z2007-03-31T23:03:35ZCDS support team

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

cds-question@unistra.frplanetary-nebulaechemical-abundancesWe present high-quality optical spectroscopic observations of the planetary nebula (PN) Hf 2-2. The spectrum exhibits many prominent optical recombination lines (ORLs) from heavy-element ions. Analysis of the H I and He I recombination spectrum yields an electron temperature of ~900K, a factor of 10 lower than given by the collisionally excited [O III] forbidden lines. The ionic abundances of heavy elements relative to hydrogen derived from ORLs are about a factor of 70 higher than those deduced from collisionally excited lines (CELs) from the same ions, the largest abundance discrepancy factor (adf) ever measured for a PN.2006MNRAS.368.1959Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/368/1959CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/368/1959https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/368/1959http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/368/1959https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/368/1959https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/368/1959http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/368/1959GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/368/1959/table2Observed relative line fluxes, on a scale where H{beta}=100recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineIdentification of line observedmeta.id;spect.linecharlambdaWavelength0.1nmem.wlintf(lambda)Reddening law (Howard, 1983MNRAS.203..301H)phot.color.excessfloatFluxO2Observed flux 2 arcsec slitwidth (1)phot.fluxfloate_FluxO2? rms uncertainty on FluxO2 (1)stat.errorfloatnullableFluxO4? Observed flux 4 arcsec slitwidth (1)phot.fluxfloatnullablee_FluxO4? rms uncertainty on FluxO4 (1)stat.errorfloatnullableFluxO8? Observed flux 8 arcsec slitwidth (1)phot.fluxfloatnullablee_FluxO8? rms uncertainty on FluxO8 (1)stat.errorfloatnullableFluxD2Dereddened flux 2 arcsec slitwidth (1)phot.fluxfloate_FluxD2? rms uncertainty on FluxD2 (1)stat.errorfloatnullableFluxD4? Dereddened flux 4 arcsec slitwidth (1)phot.fluxfloatnullablee_FluxD4? rms uncertainty on FluxD4 (1)stat.errorfloatnullableFluxD8? Dereddened flux 8 arcsec slitwidth (1)phot.fluxfloatnullablee_FluxD8? rms uncertainty on FluxD8 (1)stat.errorfloatnullableJ/MNRAS/368/1959/table4Electron temperatures and ionic and elemental abundances deduced from recombination lines and continuumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParamParameter name (e.g. El/H^+^)meta.id;spect.lineLineLine (or Adopted) Diagnostic (1)meta.id;spect.linecharA2? Abundance in 2 arcsec slitwidth spectraphys.abunddoublenullablel_A4Limit flag on A4meta.code.errorcharA4? Abundance in 4 arcsec slitwidth spectraphys.abunddoublenullableA8? Abundance in 8 arcsec slitwidth spectraphys.abunddoublenullable