J/ApJ/424/599ivo://CDS.VizieR/J/ApJ/424/599doi:10.26093/cds/vizier.14240599CDSMartin P.Roy J-R.1997-12-09T19:50:48Z1997-12-09T20:50:43ZCDS support team

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

cds-question@unistra.frh-ii-regionschemical-abundancesImaging spectrophotometry in the nebular lines H{alpha}, H{beta}, [OIII]{lambda}5007 and [NII]{lambda}6584, using narrow-band interference filters, has been performed of 82, 55, and 79 H II regions in the barred spiral galaxies NGC 925, NGC 1073, and NGC 4303, respectively. The O/H abundance gradients were derived from the abundance indicators [O III]/H{beta} and [N II]/[O III], calibrated by Edmunds & Pagel (1984MNRAS.211..507E). The global O/H gradients in NGC 925 [{DELTA}log(O/H)/{DELTA}R=0.033dex/kpc] and NGC 1073 [{DELTA}log(O/H)/{DELTA}R=0.048dex/kpc] are flatter than the gradients observed in normal galaxies of the same morphological type. The abundance gradient in NGC 4303 is identical to that found in normal spiral galaxies. A comparison is made between the O/H gradients of normal galaxies and of a sample of galaxies showing a barred morphology it is concluded that the global abundance gradients of spiral galaxies with a barred structure are in general shallower than gradients of normal galaxies. The slopes of O/H gradients are analyzed as a function of two properties of bars: the relative length of the bar with respect to the size of the disk, and the bar ellipticity, defined by the axis ratio of the bar. It is found that gradients are flatter when the length or the ellipticity of the bar increases. This result is consistent with recent models of radial flows. These observations indicate that large-scale mixing of the interstellar gas occurs across the disks of barred spiral galaxies and affects the radial distribution of elements.1994ApJ...424..599Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/424/599CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/112 : RC2 Catalogue (de Vaucouleurs+ 1976)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/424/599https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/424/599http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/424/599https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/424/599https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/424/599http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/424/599GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/424/599/table5Properties of H II regions in NGC 925recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRegion sequential numbermeta.id;meta.mainintlog([OIII]/Hb)Corrected [O III]/H{beta} line ratiospect.line.intensity;arith.ratiofloate_log([OIII]/Hb)rms uncertainty on log([OIII]/Hb)stat.errorfloatlog([NII]/[OIII])? Corrected [N II]/[O III] line ratiospect.line.intensity;arith.ratiofloate_log([NII]/[OIII])? rms uncertainty on log([NII]/[OIII])stat.errorfloatlog([NII/Ha)? Corrected [N II/H{alpha} line ratiospect.line.intensity;arith.ratiofloate_log([NII/Ha)? rms uncertainty on log([NII/Ha)stat.errorfloatR/ReffGalactocentric distance corrected for inclinationpos.distancefloatc(Hb)Logarithmic extinction at H{beta}phys.absorptionfloate_c(Hb)rms uncertainty on c(Hb)stat.errorfloatO/HO/H gradientarith.grad;phys.abundfloatJ/ApJ/424/599/table6Properties of H II regions in NGC 1073recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRegion sequential numbermeta.id;meta.mainintlog([OIII]/Hb)Corrected [O III]/H{beta} line ratiospect.line.intensity;arith.ratiofloate_log([OIII]/Hb)rms uncertainty on log([OIII]/Hb)stat.errorfloatlog([NII]/[OIII])? Corrected [N II]/[O III] line ratiospect.line.intensity;arith.ratiofloate_log([NII]/[OIII])? rms uncertainty on log([NII]/[OIII])stat.errorfloatlog([NII/Ha)? Corrected [N II/H{alpha} line ratiospect.line.intensity;arith.ratiofloate_log([NII/Ha)? rms uncertainty on log([NII/Ha)stat.errorfloatR/ReffGalactocentric distance corrected for inclinationpos.distancefloatc(Hb)Logarithmic extinction at H{beta}phys.absorptionfloate_c(Hb)rms uncertainty on c(Hb)stat.errorfloatO/HO/H gradientarith.grad;phys.abundfloatJ/ApJ/424/599/table8Properties of galaxies with abundance gradients with samples >=10 H II regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCGalaxy namemeta.id;meta.maincharTypeMorphological typesrc.morph.typecharTT parameter (de Vaucouleurs et al., 1976, Cat. <VII/112>)src.morph.paramintiInclination angledegsrc.orbital.inclinationintPA[-30/170] Position angledegpos.posAngintDistDistanceMpcpos.distancefloatNNumber of H II regions used to derive the O/H gradientmeta.numberintRad25? Radius at the 25 magnitude/arcsec^2^ isophote in blue lightarcsecphys.angSize;srcinta? Semi-major axisarcsecphys.angSize.smajAxis;src.orbitalintb? Semi-minor axisarcsecphys.angSize;srcintEbar? Bar ellipticity (Ebar=10(1-b/a))src.ellipticityinta/Rad25? a/Rad25 ratiosrc.morph.paramfloatSlopeSlope of the global O/H gradient normalized for the adopted distancekpc**-1arith.grad;phys.abundfloatr_PAReferences for inclination & position angle (1)meta.refintr_NReferences for N and slopes of gradients (1)meta.refint