J/MNRAS/480/4589ivo://CDS.VizieR/J/MNRAS/480/4589doi:10.26093/cds/vizier.74804589CDSWesson R.Jones D.Garcia-Rojas J.Boffin H.M.J.Corradi R.L.M.2024-08-18T20:21:24Z2022-06-29T13:02:51ZCDS support team

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

cds-question@unistra.frchemical-abundancesstellar-mass-lossinterstellar-mediumplanetary-nebulaemultiple-starsIt has recently been noted that there seems to be a strong correlation between planetary nebulae with close binary central stars and highly enhanced recombination line abundances. We present new deep spectra of seven objects known to have close binary central stars, and find that the heavy element abundances derived from recombination lines exceed those from collisionally excited lines by factors of 5-95, placing several of these nebulae among the most extreme known abundance discrepancies. This study nearly doubles the number of nebulae known to have a binary central star and an extreme abundance discrepancy. A statistical analysis of all nebulae with measured recombination line abundances reveals no link between central star surface chemistry and nebular abundance discrepancy, but a clear link between binarity and the abundance discrepancy, as well as an anticorrelation between abundance discrepancies and nebular electron densities: all nebulae with a binary central star with a period of less than 1.15d have an abundance discrepancy factor exceeding 10, and an electron density less than ~1000cm^-3^; those with longer period binaries have abundance discrepancy factors less than 10 and much higher electron densities. We find that [OII] density diagnostic lines can be strongly enhanced by recombination excitation, while [SII] lines are not. These findings give weight to the idea that extreme abundance discrepancies are caused by a nova-like eruption from the central star system, occuring soon after the common-envelope phase, which ejects material depleted in hydrogen, and enhanced in CNONe but not in third-row elements.2018MNRAS.480.4589Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/480/4589CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/368/1959 : Chemical abundances for Hf 2-2 (Liu+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/480/4589https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/480/4589http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/480/4589https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/480/4589https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/480/4589http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/480/4589GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/480/4589/table5 (Estimated upper limits to the abundance discrepancy factor in the cases where CEL abundances could be calculated but no recombination lines were detected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/4589/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/4589/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/4589/table5?GETtext/xml+votable180.050000true262.2584411-15.21791170.005555555555555556Cone search capability for table J/MNRAS/480/4589/table6 (Properties of the 15 nebulae with close binary central stars and a measured adf)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/4589/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/4589/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/4589/table6?GETtext/xml+votable180.050000true277.827462826.93669750.005555555555555556Cone search capability for table J/MNRAS/480/4589/tablea1 (Observing log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/4589/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/4589/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/4589/tablea1?GETtext/xml+votable180.050000true262.2584411-15.21791170.0055555555555555565/7205 6/12938 13997 21666 22093 28713 28718 28721-28722 28730-28731 28766 28778 28864 28866-28867 28871 28910 29393 30288 32068 32581 38001 38105 39283 40130 41664 41729 42099 42162 42185 42354 42437 42505 42579 42711 47859 48776https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/480/4589?format=asciidefaultJ/MNRAS/480/4589/table5Estimated upper limits to the abundance discrepancy factor in the cases where CEL abundances could be calculated but no recombination lines were detectedSimbadNameSimbad column added by the CDSmeta.idcharnullablel_adfadf upper limitmeta.code.errorcharNe[OII]? Electron density from [OII]cm**-3phys.density;phys.electronintnullableE_Ne[SII]? Upper error on Ne[SII]cm**-3stat.error;stat.maxintnullablee_Ne[SII]? Lower error on Ne[SII]cm**-3stat.errorintnullableE_Ne[OII]? Upper error on Ne[OII]cm**-3stat.error;stat.maxintnullablee_Ne[OII]? Lower error on Ne[OII]cm**-3stat.errorintnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharRLO2/HUpper limits for the RL abundances of O2+/H+phys.abundfloatCELO2/HObserved CEL abundances of O2+/H+phys.abundfloatadfUpper limit to the abundance discrepancy factorphys.abundintPorbOrbital perioddtime.periodfloatNe[SII]? Electron density from [SII]cm**-3phys.density;phys.electronintnullableJ/MNRAS/480/4589/table6Properties of the 15 nebulae with close binary central stars and a measured adfSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxesindicates observed and dereddened line fluxes in tableb1meta.ref.urlcharNameObject namemeta.id;meta.maincharprimaryadfAbundance discrepancy factorphys.abundfloatE_adf? Upper error on adfstat.error;stat.maxfloatnullablee_adf? Lower error on adfstat.errorfloatnullablePBinary orbital perioddtime.periodfloatu_P[ ?] Uncertainty on Pmeta.code.errorcharN/HN/H abundancephys.abundfloatO/HO/H abundancephys.abundfloatu_Ne[ ~] Uncertainty on Nemeta.code.errorcharNeElectron densitycm**-3phys.density;phys.electronintRefReferences (1)meta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/480/4589/tablea1Observing logSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainNameObject namemeta.id;meta.maincharPA[] Position angledegpos.posAngintGrismGrism (GRIS_1200B, GRIS_1200R or GRIS_600RI grisms)meta.notecharExpTimeExposure timestime.duration;obs.exposureintMJDModified Julian Datedtime.epochdoubleAirmassAirmassobs.airMassfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainJ/MNRAS/480/4589/tableb1Observed and dereddened line fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharLDist? Lower value of distance interval from central stararcsecpos.angDistancefloatnullableUDist? Upper value of distance interval from central stararcsecpos.angDistancefloatnullablelambda? Wavelength0.1nmem.wlfloatnullablelambdaIonIon wavelength0.1nmem.wlfloatF(lambda)? Observed flux (1)phot.fluxdoublenullablee_F(lambda)? Observed flux error (1)stat.errorfloatnullableI(lambda)? Integrated flux (1)phot.fluxdoublenullablee_I(lambda)? Integrated flux error (upper value) (1)stat.errorfloatnullableE_I(lambda)? Integrated flux error (lower value) (1)stat.error;stat.maxfloatnullableIonIonphys.atmol.ionStagecharMultMultipletphys.atmol.levelcharLtermLower termphys.atmol.termcharUtermUpper termphys.atmol.termcharg1? g1 valuemeta.numberintnullableg2? g2 valuemeta.numberintnullable