J/A+A/448/955ivo://CDS.VizieR/J/A+A/448/955doi:10.26093/cds/vizier.34480955CDSIzotov Y.I.Stasinska G.Meynet G.Guseva N.G.Thuan T.X.2006-05-06T09:46:59Z2006-05-06T09:42:11ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyh-ii-regionschemical-abundancesWe have re-evaluated empirical expressions for the abundance determination of N, O, Ne, S, Cl, Ar and Fe taking into account the latest atomic data and constructing an appropriate grid of photoionization models with state-of-the art model atmospheres. Using these expressions we have derived heavy element abundances in the ~310 emission-line galaxies from the Data Release 3 of the Sloan Digital Sky Survey (SDSS, <III/241>) with an observed Hbeta flux F(Hbeta)>10^-14^erg/s/cm^2^ and for which the [O III] 4363 emission line was detected at least at a 2sigma level, allowing abundance determination by direct methods. The oxygen abundance 12+logO/H of the SDSS galaxies lies in the range from ~7.1 (Z_{sun}_/30) to ~8.5 (0.7Z_{sun}_). The SDSS sample is merged with a sample of 109 blue compact dwarf (BCD) galaxies with high quality spectra, which contains extremely low-metallicity objects. We use the merged sample to study the abundance patterns of low-metallicity emission-line galaxies. We find that extremely metal-poor galaxies (12+logO/H<7.6, i.e. Z<Z_{sun}_/12) are rare in the SDSS sample. The alpha element to oxygen abundance ratios do not show any significant trends with oxygen abundance, in agreement with previous studies, except for a slight increase of Ne/O with increasing metallicity, which we interpret as due to a moderate depletion of O onto grains in the most metal-rich galaxies. The Fe/O abundance ratio is smaller than the solar value, by up to 1 dex at the high metallicity end. We also find that Fe/O increases with decreasing Hbeta equivalent width EW(Hbeta). We interpret this as a sign of strong depletion onto dust grains, and gradual destruction of those grains on a time scale of a few Myr. All the galaxies are found to have logN/O>-1.6, implying that they have a different nature than the subsample of high-redshift damped Lyalpha systems with log N/O of ~-2.3 and that their ages are larger than 100-300Myr. We confirm the apparent increase in N/O with decreasing EW(Hbeta), already shown in previous studies, and explain it as the signature of gradual nitrogen ejection by massive stars from the most recent starburst.2006A&A...448..955Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/448/955CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005)III/241 : Spectroscopy of SDSS Data Release 3 (SDSS-DR3) (ARC, 2005)http://www.sdss.org/dr3/ : SDSS-R3 Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/448/955https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/448/955http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/448/955https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/448/955https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/448/955http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/448/955GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/448/955/gal (Extinction-corrected fluxes and element abundances of the emission lines in the spectra of the SDSS galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/448/955/gal?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/448/955/gal?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/448/955/gal?GETtext/xml+votable180.050000true146.00779-0.642270.0055555555555555566/4096 4149 4181 5100 5109 5594 5623-5624 5706 5731 5750 5764 5799 5825 5927 5933 5940 5950 5954 5967 5971 5993 5998 6005 6034 6046 6063 6075 6085 6098 6104 6114 6128 6131 6139 6142 6385 6402 6419 6470 6496 6523 6599 6604 6619 6623 7172 7185 7190 7208 7220 7243 7252 7259 7261 7265-7267 7272-7273 7281 7303 7307 7315 7320 7379 7381 7431 7504 7512 7518 7524 7532 9199 9208 9319 9481 9512 9606 9644 9817 9829 9855 9934 9943 9949 9952 9954 9989 10095 10104 10106 10202 10215 10219 10583 10619 10911 10976 11006 11033 11090 11101 11115 11168 11177 11180 11198 11234 11239 11246-11247 11269 11283 11290 11302 11308 11318 11326 11341 11355 11380 11389 11403-11404 11433-11434 11782 11813 11825 11828 11846 11874 11907 11922 11928 11968 17223 17242 17249 17260 17491-17492 17506 17516 17558 17560 17570 17601 17748 17767 17858 18002 18004 18013 18025 18027 18074 18098 18388 18792 18849 18858 19028 19323 19325 19327 19754 19756 20002 21877 21970 23046 23076 23196 25585 25594 25598 25843 25851 25937-25938 25947 25959 25979-25980 26010 26032 26086-26087 26142 26159 26161-26162 26174 26178 26180 26205 26223 26226 26234 26253 26256 26275 26278 26289 26302 26309 26313 26329 26338 26353 26390 26392 26396 26942 26960 26964 26970 26999 27034 27047 27053 27079 27088-27089 27199 27215 27229 27231 27243 27246 27260 27315 27320 27328 27330 27332-27334 27337 27409 27418 27431 27446 27477 27654 27657 27665 27668 27677 27697 27732 27735 27811 31316 31396 32682 36766-36767 36775 36779 36785 36789 36808 48990 49011 49015-49017 49101https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/448/955?format=asciiOpticaldefaultJ/A+A/448/955/galExtinction-corrected fluxes and element abundances of the emission lines in the spectra of the SDSS galaxies12+logO/HOxygen abundance 12+logO/Hphys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameThe spectrum number in the SDSS databasemeta.id;obs.exposurecharF3727Extinction-corrected flux of the [O II] 3727 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F3727rms uncertainty on [O II] 3727 fluxstat.errorfloatF3750Extinction-corrected flux of the H12 3750 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F3750rms uncertainty on H12 3750 fluxstat.errorfloatF3771Extinction-corrected flux of the H11 3771 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F3771rms uncertainty on H11 3771 fluxstat.errorfloatF3797Extinction-corrected flux of the H10 3797 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F3797rms uncertainty on H10 3797 fluxstat.errorfloatF3835Extinction-corrected flux of the H9 3835 line relative to H betaspect.line.intensity;arith.ratiofloate_F3835rms uncertainty on H9 3835 fluxstat.errorfloatF3868Extinction-corrected flux of the [Ne III] 3868 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F3868rms uncertainty on [Ne III] 3868 fluxstat.errorfloatF4101Extinction-corrected flux of the Hdelta 4101 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4101rms uncertainty on Hdelta 4101 fluxstat.errorfloatF4340Extinction-corrected flux of the Hgamma 4340 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4340rms uncertainty on Hgamma 4340 fluxstat.errorfloatF4363Extinction-corrected flux of the [O III] 4363 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4363rms uncertainty on [O III] 4363 fluxstat.errorfloatF4658Extinction-corrected flux of the [Fe III] 4658 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4658rms uncertainty on [Fe III] 4658 fluxstat.errorfloatF4686Extinction-corrected flux of the He II 4686 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4686rms uncertainty on He II 4686 fluxstat.errorfloatF4740Extinction-corrected flux of the [Ar IV] 4740 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4740rms uncertainty on [Ar IV] 4740 fluxstat.errorfloatF4861[1.0] Extinction-corrected flux of the Hbeta 4861 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4861rms uncertainty on Hbeta 4861 fluxstat.errorfloatF4959Extinction-corrected flux of the [O III] 4959 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4959rms uncertainty on [O III] 4959 fluxstat.errorfloatF4988Extinction-corrected flux of the [Fe III] 4988 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F4988rms uncertainty on [Fe III] 4988 fluxstat.errorfloatF5525Extinction-corrected flux of the [Cl III] 5517+5538 lines relative to Hbetaphot.flux;arith.ratiofloate_F5525rms uncertainty on [Cl III] 5517+5538 fluxstat.errorfloatF5876Extinction-corrected flux of the He I 5876 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F5876rms uncertainty on He I 5876 fluxstat.errorfloatF6300Extinction-corrected flux of the [O I] 6300 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F6300rms uncertainty on [O I] 6300 fluxstat.errorfloatF6312Extinction-corrected flux of the [S III] 6312 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F6312rms uncertainty on [S III] 6312 fluxstat.errorfloatF6563Extinction-corrected flux of the Halpha 6563 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F6563rms uncertainty on Halpha 6563 fluxstat.errorfloatF6584Extinction-corrected flux of the [N II] 6584 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F6584rms uncertainty on [N II] 6584 fluxstat.errorfloatF6725Extinction-corrected flux of the [S II] 6717+6731 lines relative to Hbetaphot.flux;arith.ratiofloate_F6725rms uncertainty on [S II] 6717+6731 fluxstat.errorfloatF7136Extinction-corrected flux of the [Ar III] 7136 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F7136rms uncertainty on [Ar III] 7136 fluxstat.errorfloatF7325Extinction-corrected flux of the [O II] 7320+7331 lines relative to Hbetaspect.line.intensity;arith.ratiofloate_F7325rms uncertainty on [O II] 7320+7331 fluxstat.errorfloatF9069Extinction-corrected flux of the [S III] 9069 line relative to Hbetaspect.line.intensity;arith.ratiofloate_F9069rms uncertainty on [S III] 9069 fluxstat.errorfloatEWHbEquivalent width of the Hbeta emission line0.1nmspect.line.eqWidth;em.line.HbetafloatFHbObserved Hbeta flux1e-19W.s**-1.m**-2phot.flux;em.line.HbetafloatcHbExtinction coefficientobs.atmos.extinctionfloatTeElectron temperature Te(O III)0.0001Kphys.temperature.electron;phys.electronfloate_Terms uncertainty on Te(O III)0.0001Kstat.errorfloate_12+logO/Hrms uncertainty on oxygen abundance 12+logO/Hstat.error;phys.abundfloatlogN/OLogarithm of the nitrogen-to-oxygen abundance ratio logN/Ophys.abundfloate_logN/Orms uncertainty on logN/Ostat.error;phys.abundfloatlogNe/OLogarithm of the neon-to-oxygen abundance ratio logNe/Ophys.abundfloate_logNe/Orms uncertainty on logNe/Ostat.error;phys.abundfloatlogS/OLogarithm of the sulfur-to-oxygen abundance ratio logS/Ophys.abundfloate_logS/Orms uncertainty on logS/Ostat.error;phys.abundfloatlogAr/OLogarithm of the argon-to-oxygen abundance ratio logAr/Ophys.abundfloate_logAr/Orms uncertainty on logAr/Ostat.error;phys.abundfloatlogCl/OLogarithm of the chlorine-to-oxygen abundance ratio logCl/Ophys.abundfloate_logCl/Orms uncertainty on logCl/Ostat.error;phys.abundfloatlogFe/OLogarithm of the iron-to-oxygen abundance ratio logFe/Ophys.abundfloate_logFe/Orms uncertainty on logFe/Ostat.error;phys.abund.FefloatRAJ2000? Right Ascension (J2000) from SDSS-DR3 (1)degpos.eq.ra;meta.mainnullableDEJ2000? Declination (J2000) from SDSS-DR3 (1)degpos.eq.dec;meta.mainnullableSDSSSDSS name from SDSS-DR3 (1)meta.id;meta.maincharSDSSdataDisplay the current SDSS data about this objectmeta.ref.urlchar