J/A+AS/106/559ivo://CDS.VizieR/J/A+AS/106/559CDSTylenda R.Stasinska G.Acker A.Stenholm B.2000-02-28T07:12:11Z2000-02-28T08:08:41ZCDS support team

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

cds-question@unistra.frplanetary-nebulaespectroscopyWe have compiled the intensities of the HeII 4686 lines measured in Galactic planetary nebulae. We present a few observational diagrams related to this parameter, and discuss them with the help of theoretical diagrams obtained from simple model planetary nebulae surrounding evolving central stars of various masses. We determine the hydrogen and helium Zanstra temperature for all the objects with accurate enough data. We argue that, for Galactic planetary nebulae as a whole, the main cause for the Zanstra discrepancy is leakage of stellar ionizing photons from the nebulae.1994A&AS..106..559Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/106/559CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/84 : Strasbourg-ESO Catalogue of Galactic PLanetary Nebulaehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/106/559https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/106/559http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/106/559https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/106/559https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/106/559http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/106/559GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/106/559/table1Intensities of HeII4686 and Halpha for Galactic planetary nebulaerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPNGPNG number of the planetary nebulae from the Strasbourg-ESO cataloguemeta.idcharNameUsual name of the planetary nebulaemeta.id;meta.maincharl_HeIILimit flag for HeII 4686 intensitymeta.code.errorcharHeIIIntensity of HeII 4686 on the scale Hbeta=100spect.line.intensity;arith.ratiofloatu_HeIIUncertainty flag on HeII 4686 intensitymeta.code.errorcharr_HeIIComma-separated short references for HeII 4686 (see refs.dat, full references in the paper)meta.refcharl_HalphaLimit flag for Halpha intensitymeta.code.errorcharHalpha[]? intensity of the Halpha line on the scale Hbeta=100spect.line.intensity;arith.ratiofloatnullableu_HalphaUncertainty flag on Halpha intensitymeta.code.errorcharr_HalphaComma-separated short references for Halpha (see refs.dat, full references in the paper)meta.refcharJ/A+AS/106/559/refsReferences (bibcodes)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intRefCodeReference codecharBibCodeThe 19-digit bibcodecharTextAuthors of the paperchar