J/A+A/345/629ivo://CDS.VizieR/J/A+A/345/629doi:10.26093/cds/vizier.33450629CDSMaciel W.J.Quireza C.1999-05-06T10:18:44Z1999-05-06T10:18:35ZCDS support team

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

cds-question@unistra.frplanetary-nebulaechemically-peculiar-starsRadial abundance gradients of the element ratios O/H, Ne/H, S/H, and Ar/H are determined on the basis of a sample of disk planetary nebulae. The behaviour of the gradients at large distances from the galactic centre, R>R_0_=7.6kpc, is emphasized. It is concluded that the derived gradients are consistent with an approximately constant slope in the inner parts of the Galaxy, and some flattening for distances larger than R_0_. A comparison is made with previous determinations using both photoionized nebulae and young stars, and some consequences on theoretical models for the chemical evolution of the galactic disk are discussed.1999A&A...345..629Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/345/629CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+ 1992)J/A+A/282/436 : Abundance gradients from disk PNs (Maciel+ 1994)J/A+A/313/924 : Relative fluxes in 11 type I PN (Costa+, 1996)J/A+A/423/199 : Chemical abundances of planetary nebulae (Costa+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/345/629https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/345/629http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/345/629https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/345/629https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/345/629http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/345/629GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/345/629/table1Data for disk planetary nebulaerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCommon name of the nebulameta.id;meta.maincharPNGPNG catalogue numbermeta.idcharDistDistancekpcpos.distancefloatGDistGalactocentric distancekpcpos.distancefloatO/HO/H abundance in the form: log (O/H) + 12phys.abundfloatNe/HNe/H abundance in the form: log (Ne/H) + 12phys.abundfloatS/HS/H abundance in the form: log (S/H) + 12phys.abund.XfloatAr/HAr/H abundance in the form: log (Ar/H) + 12phys.abund.XfloatRefReference of the abundances (1)meta.refchar