J/A+A/413/159ivo://CDS.VizieR/J/A+A/413/159doi:10.26093/cds/vizier.34130159CDSAndrievsky S.M.Luck R.E.Martin P.Lepine J.R.D.2017-09-19T14:24:19Z2004-03-24T16:15:40ZCDS support team

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

cds-question@unistra.frvariable-starschemically-peculiar-starsThis paper reports on the spectroscopic investigation of 12 Cepheids which are situated in the crucial region of galactocentric distances from 9kpc to 12kpc, where according to our previous results (Andrievsky et al., 2002, Cat. <J/A+A/392/491>; Luck et al., 2003A&A...401..939L) the radial metallicity distribution experiences an obvious change. In particular, the wriggle in the iron abundance distribution is found to fall approximately at galactocentric distances 10-11kpc (assuming galactocentric distance of the Sun kpc). Within the transition zone from 10 to 11kpc the relative-to-solar iron abundance decreases approximately to -0.2dex. The new sample of stars, analyzed in present paper, gives results supporting the previous conclusion about the multimodal character of the metallicity distribution in galactic disc. Using a quite simple consideration of galactic chemical evolution we show that the observed distribution can be explained in the framework of a model which includes the spiral arms. In particular, the wriggle feature associated with 11 kpc can be interpreted as a change of metallicity level in the vicinity of the galactic corotation resonance.2004A&A...413..159Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/413/159CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/381/32 : Galactic Cepheid abundances. I. (Andrievsky+, 2002)J/A+A/392/491 : Galactic abundance gradient. III. (Andrievsky+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/413/159https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/413/159http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/413/159https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/413/159https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/413/159http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/413/159GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/413/159/stars (Star positions and magnitudes (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/413/159/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/413/159/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/413/159/stars?GETtext/xml+votable180.050000true85.622537.6461110.0055555555555555566/1348 1749 1765 21542 21648 22438 23841 23846 24002 24326 24372 24479 39886https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/413/159?format=asciiOpticaldefaultJ/A+A/413/159/starsStar positions and magnitudes (from Simbad)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmag? B magnitudemagphot.mag;em.opt.BfloatnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableSpTypeSpectral typesrc.spTypecharSimbadSimbad column added by the CDSmeta.refcharJ/A+A/413/159/tablea1Individual elemental abundances for program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharIonIon atomic number (1)phys.atmol.ionizationfloat[M/H]? Relative-to-solar abundancelog(Sun)phys.abundfloatnullablee_[M/H]? rms uncertainty on [M/H]log(Sun)stat.errorfloatnullableNline? Number of lines usedmeta.numberintnullable(M/H)? Absolute abundance (in the scale log(H)=12.00)phys.abundfloatnullable