J/AJ/141/90ivo://CDS.VizieR/J/AJ/141/90doi:10.26093/cds/vizier.51410090CDSLee Y.S.Beers T.C.Prieto C.A.Lai D.K.Rockosi C.M.Morrison H.L.,Johnson J.A.An D.Sivarani T.Yanny B.2017-10-03T05:13:02Z2012-08-17T16:21:25ZCDS support team

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

cds-question@unistra.frsurveyschemical-abundancesspectroscopyeffective-temperatureWe present a method for the determination of [{alpha}/Fe] ratios from low-resolution (R=2000) SDSS/SEGUE stellar spectra. By means of a star-by-star comparison with degraded spectra from the ELODIE spectral library and with a set of moderately high-resolution (R=15000) and medium-resolution (R=6000) spectra of SDSS/SEGUE stars, we demonstrate that we are able to measure [{alpha}/Fe] from SDSS/SEGUE spectra (with S/N>20/1) to a precision of better than 0.1dex, for stars with atmospheric parameters in the range Teff=[4500,7000]K, logg=[1.5,5.0], and [Fe/H]=[-1.4,+0.3], over the range [{alpha}/Fe]=[-0.1,+0.6]. For stars with [Fe/H]<-1.4, our method requires spectra with slightly higher signal-to-noise to achieve this precision (S/N>25/1).2011AJ....141...90Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/141/90CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)J/AJ/136/2070 : SEGUE stellar parameter pipeline. III. (Lee+, 2008)J/AJ/141/89 : SEGUE stellar parameter pipeline. IV. (Smolinski+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/141/90https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/141/90http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/141/90https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/141/90https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/141/90http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/141/90GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/141/90/table1 (List of parameters for selected ELODIE spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/141/90/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/141/90/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/141/90/table1?GETtext/xml+votable180.050000true2.211750386.78788190.005555555555555556Cone search capability for table J/AJ/141/90/table2 (List of parameters for HET and ESI spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/141/90/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/141/90/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/141/90/table2?GETtext/xml+votable180.050000true259.2187560.65747220.0055555555555555566/49 215 455 684 706 798 819 918 934 987 1028 1084 1247 1330 1341 1556 1728 1827 1914 2064 2066 2089 2093 2095 2133 2169 2199 2206 2248 2291 2297 2298 2317 2366 2472 2476 2622 2650 2697 2923 3020 3036 3085 3102 3258 3494 3639 3662 3691 4079 4227 4376 4735 4746 4768 4772 4782 4783 5053 5154 5195 5250 5266 5304 5413 5488 5496 5498 5522 5718 5726 5836 5885 5929 5932 6025 6056 6096 6143 6219 6226 6240 6241 6256 6302 6351 6362 6373 6384 6386 6398 6409 6523 6564 6611 6926 7354 7763 8094 8210 8476 8663 8814 8843 9072 9125 9327 9403 9449 9476 9492 9537 9607 9613 9662 9679 9801 9835 9873 9969 10215 10375 10812 10886 10899 11142 11150 11177 11228 11239 11412 11633 11644 11713 11806 11831 11834 12295 12320 12332 12337 12408 12424 12451 12555 12621 12658 12704 12807 12816 12824 13025 13028 13075 13164 13474 13478 13547 13682 14131 14151 14180 14252 14278 14358 14385 14419 14426 14534 14539 14679 14743 14901 15030 15044 15107 15118 15174 15597 15722 15727 16031 16069 16144 16213 16252 16883 17124 17136 17171 17219 17245 17298 17425 17518 17576 17606 17746 17757 17758 17768 17837 17998 18002 18011 18033 18123 18139 18184 18544 18608 18615 18782 18843 18887 18915 19099 19132 19179 19181 19312 19323 19415 19585 19647 19740 19745 19912 19923 19940 19941 19943 19952 19983 20145 20278 20402 20440 20446 20452 20461 21177 21484 21696 21699 21726 21838 21858 21864 21901 21989 22040 22157 22180 22205 22300 22340 22354 22355 22654 22708 22818 22823 22841 22868 23048 23096 23140 23161 23185 23190 23201 23230 23271 23284 23515 23575 23583 23600 23624 23774 23938 24016 24029 24130 24151 24178 24536 25444 25766 25846 25862 25869 25939 25966 26124 26379 26468 26521 26575 26975 27006 27075 27121 27124 27254 27255 27374 27712 27975 28336 28494 28605 28664 29675 29765 29784 30049 30123 30127 30206 30529 30540 30576 30577 30579 30658 30825 30878 30965 31048 31094 31101 31130 31172 31204 31393 31399 31416 31433 31478 31751 31768 31796 31848 31874 31904 31920 32034 32192 32343 32517 32530 32536 32539 32553 32555 32561 32619 32757 36664 36697 40716 40823 40932 44284 44542 48891 49106 49114https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/141/90?format=asciiOpticaldefaultJ/AJ/141/90/table1List of parameters for selected ELODIE spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHD identification numbermeta.id;meta.maincharELODIEELODIE identification numbermeta.idintTeff1ELODIE effective temperatureKphys.temperature.effectiveintlogg1ELODIE log surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]1ELODIE metallicitylog(Sun)phys.abund.Fefloat[a/Fe]1ELODIE {alpha} abundancelog(Sun)phys.abundfloate_[a/Fe]1? Uncertainty in [a/Fe]_1 (1)log(Sun)stat.error;phys.abundfloatnullablelogg2SSPP log surface gravity (2)log(cm.s**-2)phys.gravityfloate_logg2Uncertainty in logg2log(cm.s**-2)stat.errorfloat[Fe/H]2SSPP metallicitylog(Sun)phys.abund.Fefloate_[Fe/H]2Uncertainty in [Fe/H]2log(Sun)stat.error;phys.abund.Fefloat[a/Fe]2SSPP {alpha} abundancelog(Sun)phys.abundfloate_[a/Fe]2Uncertainty in [a/Fe]2log(Sun)stat.error;phys.abundfloatSimbadSimbad column added by the CDSmeta.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/AJ/141/90/table2List of parameters for HET and ESI spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintP-M-FSDSS Plate-MJD-Fiber identificationmeta.idcharSDSSSDSS Designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharTeff1High-Resolution analysis effective temperatureKphys.temperature.effectiveinte_Teff1Uncertainty in Teff1Kstat.errorintlogg1High-Resolution analysis log surface gravity (1)log(cm.s**-2)phys.gravityfloate_logg1Uncertainty in logglog(cm.s**-2)stat.errorfloat[Fe/H]1High-Resolution analysis metallicity (1)log(Sun)phys.abund.Fefloate_[Fe/H]1Uncertainty in [Fe/H]1log(Sun)stat.error;phys.abund.Fefloat[a/Fe]1High-Resolution analysis {alpha} abundancelog(Sun)phys.abundfloate_[a/Fe]1Uncertainty in [a/Fe]1log(Sun)stat.error;phys.abundfloatTeff2SSPP effective temperature (1)Kphys.temperature.effectiveinte_Teff2Uncertainty in Teff2Kstat.errorintlogg2SSPP log surface gravity (1)log(cm.s**-2)phys.gravityfloate_logg2Uncertainty in logg2log(cm.s**-2)stat.errorfloat[Fe/H]2SSPP metallicity (1)log(Sun)phys.abund.Fefloate_[Fe/H]2Uncertainty in [Fe/H]2log(Sun)stat.error;phys.abund.Fefloat[a/Fe]2SSPP {alpha} abundance (1)log(Sun)phys.abundfloate_[a/Fe]2Uncertainty in [a/Fe]2log(Sun)stat.error;phys.abundfloatRef[HET ESI] Facility of high-resolution: HET = Hobby Eberly Telescope, or ESI = Keck Echellete Spectrograph and Imagermeta.id;instr.telcharSloanDisplay the SDSS data for this starmeta.ref.urlchar_RAPositions from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS name (declination part)degpos.eq.dec;meta.main