Deep SDSS Optical Spectroscopy. II. J/A+A/577/A81 ivo://CDS.VizieR/J/A+A/577/A81 doi:10.26093/cds/vizier.35770081 CDS Fernandez-Alvar E. Allende Prieto C. Schlesinger K.J. Beers T.C.,Robin A.C. Schneider D.P. Lee Y.S. Bizyaev D. Ebelke G.,Malanushenko E. Malanushenko V. Oravetz D. Pan K. Simmons A. 2017-10-09T13:34:25Z 2015-05-07T08:17:21Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr halo-stars stellar-distance metallicity We analyze a sample of 3942 low-resolution (R~2000) optical spectra from the Sloan Digital Sky Survey (SDSS), focusing on stars with effective temperatures 5800<Teff<6300K, and distances from the Milky Way plane in excess of 5kpc, and determine their abundances of Fe, Ca, and Mg. This work follows the same methodology as in the previous paper in this series, deriving atmospheric parameters by chi^2^ minimization, but we now obtain the abundances of individual elements by fitting their associated spectral lines. Distances are calculated from absolute magnitudes obtained by a statistical comparison of our stellar parameters with stellar-evolution models. The observations reveal a decrease in the abundances of iron, calcium and magnesium at large distances from the Galactic center. The median abundances for the halo stars analyzed are fairly constant up to a Galactocentric distance r~20kpc, rapidly decrease between r~20 and r~40kpc, and flatten out to significantly lower values at larger distances, consistent with previous studies. In addition, we examine the Ca/Fe and Mg/Fe ratios as a function of Fe/H and Galactocentric distance. Our results show that the most distant parts of the halo show a steeper variation of the Ca/Fe and Mg/Fe with iron. We found that at the range -1.6<[Fe/H]<-0.4 the Ca/Fe ratio decreases with distance, in agreement with earlier results based on local stars. However, the opposite trend is apparent for Mg/Fe. Our conclusion that the outer regions of the halo are more metal-poor than the inner regions, based on in-situ observations of distant stars, is in concert with recent results based on inferences from the kinematics of more local stars, and with predictions of recent galaxy formation simulations for galaxies similar to the Milky Way. 2015A&A...577A..81F https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/577/A81 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/A+A/568/A7 : Model SDSS colors for halo stars (Allende Prieto+, 2014) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/577/A81 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/577/A81 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/577/A81 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/577/A81 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/577/A81 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/577/A81 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/577/A81/stars (Stellar parameters, abundances and distances for SDSS/SEGUE (table2) and BOSS (table3) samples) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/577/A81/stars? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/577/A81/stars? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/577/A81/stars? 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32446-32447 32458 32476 32478 32488 32490 32499 32506 32536 32555-32556 32558 32672 32674 32683 32697 32699 36717 36719 36723 36725 36729-36731 36734 36765 36781-36783 36792 36794 36802-36803 36805-36807 36816 36860 45054-45055 48863 48883 48886 48889-48891 49010 49017-49018 49020 49077 49095 49123 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/577/A81?format=ascii Optical default J/A+A/577/A81/stars Stellar parameters, abundances and distances for SDSS/SEGUE (table2) and BOSS (table3) samples JName Simbad column added by the CDS meta.id;meta.main char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int T Simbad column added by the CDS meta.id;meta.dataset char PMF Plate-mjd-fiber identification meta.id char Teff [5800/6300] Effective temperature K phys.temperature.effective int e_Teff [8/122] Effective temperature error K stat.error;phys.temperature.effective int logg [2.5/4.4] log_10_ of the surface gravity log(cm.s**-2) phys.gravity float e_logg [0.05/1] log_10_ of the surface gravity error log(cm.s**-2) stat.error float [Fe/H] i[-3.7/0.5] Iron abundance log(Sun) phys.abund float e_[Fe/H] [0.05/0.5] Iron abundance error log(Sun) stat.error;phys.abund.Fe float [Ca/H] [-4.3/-0.2]? Calcium abundance log(Sun) phys.abund float nullable e_[Ca/H] [0.01/0.4]? Calcium abundance error log(Sun) stat.error;phys.abund float nullable [Mg/H] [-3.6/-0]? Magnesium abundance log(Sun) phys.abund float nullable e_[Mg/H] [0.04/0.5]? Magnesium abundance error log(Sun) stat.error;phys.abund float nullable dsun [5/127] Distance from the sun kpc pos.distance;pos.heliocentric float e_dsun [0.2/1.5] Distance from the sun error kpc stat.error float r [5.7/132] Distance from the Galaxy center kpc pos.distance;pos.galactocentric float Z [-76./103] Distance from the galactic plane kpc pos.cartesian.z;pos.galactic float Sp Interactive spectrum from SDSS meta.ref.url char _RA Simbad column added by the CDS deg pos.eq.ra;meta.main nullable _DE Simbad column added by the CDS deg pos.eq.dec;meta.main nullable