J/AJ/150/187ivo://CDS.VizieR/J/AJ/150/187doi:10.26093/cds/vizier.51500187CDSLee Y.S.Beers T.C.Carlin J.L.Newberg H.J.Hou Y.Li G.Luo A.-L.,Wu Y.Yang M.Zhang H.Zhang W.Zhang Y.2017-01-23T22:00:00Z2016-04-26T12:59:38ZCDS support team

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

cds-question@unistra.frstellar-atmosphereschemical-abundancesmetallicityeffective-temperatureWe describe an application of the SEGUE Stellar Parameter Pipeline (SSPP) to medium-resolution stellar spectra obtained by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), in order to determine estimates of the stellar atmospheric parameters (T_eff_, logg, and [Fe/H]) and the abundance ratios ([{alpha}/Fe] and [C/Fe]). By performing a coordinate match with the LAMOST stellar database, we selected stars with LAMOST spectra in common with stars having available spectroscopy from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), the RAdial Velocity Experiment (RAVE), and the Sloan Extension for Galactic Understanding and Exploration (SEGUE). We ran the selected LAMOST stellar spectra from each survey through SSPP, and compared the stellar parameters down to signal-to-noise ratio (S/N) of 10 and chemical abundances down to S/N=20 derived by SSPP with those determined by the APOGEE, RAVE, and SEGUE software pipelines. Our results show that the derived stellar parameters generally agree quite well, even though there exist some small systematic offsets with small scatter in T_eff_, logg, and [Fe/H], due to the use of different temperature scales, abundance scales, and calibrations adopted by each survey. Comparison of the [{alpha}/Fe] determinations for LAMOST spectra suggests no sign of significant systematic offsets (< -0.04dex), with a small scatter (<0.08dex) relative to stars in common with APOGEE and SEGUE. The [C/Fe] estimates determined for the LAMOST spectra also exhibit good agreement, with a very small offset (~0.01dex) and scatter (~0.12dex) relative to the SEGUE stars, while there exists about a -0.19dex offset, with a small scatter of ~0.13dex, for the APOGEE sample. Due to the existence of small offsets in the stellar parameters and abundances among difference data sets, optimal results when combining the different data sets will be obtained by removing the offsets. Once accomplished, the stellar parameters and chemical abundances estimated by SSPP from the LAMOST stellar spectra should provide a reliable database for studies of the Galactic disk and halo systems.2015AJ....150..187Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/187CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/146 : LAMOST DR1 catalogs (Luo+, 2015)III/272 : RAVE 4th data release (Kordopatis+, 2013)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)J/MNRAS/448/822 : LAMOST candidate members of star clusters (Xiang+, 2015)J/AJ/146/133 : SDSS-III APOGEE DR10 stellar parameters (Meszaros+, 2013)J/AJ/142/193 : RAVE stellar elemental abundances (DR1) (Boeche+, 2011)J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 2011)J/AJ/141/89 : SEGUE stellar parameter pipeline. IV. (Smolinski+, 2011)J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)J/ApJ/737/9 : RAVE spectroscopy of stars in thick disk (Ruchti+, 2011)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/AJ/136/2070 : SSPP. III. (Allende Prieto+, 2008)J/AJ/136/2050 : SEGUE stellar parameter pipeline (SSPP). II. (Lee+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/187https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/187http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/187https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/187https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/187http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/187GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/187/table1 (List of LAMOST stars used to validate LAMOST/SEGUE Stellar Parameter Pipeline (LSSPP) parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/187/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/187/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/187/table1?GETtext/xml+votable180.050000true0.1026251.20580560.0055555555555555564/369 5/16 215 227 280 306 322 339 360 362 386 440 444 484 551 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31336 31337 31338 31342 31356 31357 31358 31367 31369 31370 31371 31372 31374 31375 31380 31381 31386 31393 31395 31408 31410 31411 31424 31425 31426 31433 31453 31459 31460 31462 31463 31473 31488 31528 31530 31624 32478 32479 32494 32497 32500 32506 32507 32696 32701 32702 32703 32744 32746 36782 36813 36826 36861 36862 36863 40862 40880 40881 40884 40889 40930 40931 40934 44991 45023 45036 45038 45039 45043 45046 45049 45050 48989 48990 48991 48997 48998 48999 49005 49006 49007 49008 49010 49011 49014 49020 49022 49023 49093 49095 49105 49106 49107 49108 49110https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/187?format=asciidefaultJ/AJ/150/187/table1List of LAMOST stars used to validate LAMOST/SEGUE Stellar Parameter Pipeline (LSSPP) parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTLAMOST identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharV/146Display the data from LAMOST-DR1 (Luo et al. 2015, cat. V/146) within 1.5''meta.ref.urlcharRTeffReference effective temperature (1)Kmeta.ref;phys.temperature.effectiveintRloggLog reference surface gravity (1)log(cm.s**-2)meta.ref;phys.gravityfloatR[Fe/H]Log reference Fe/H abundance ratio (1)log(Sun)meta.ref;phys.abund.Fe;arith.ratiofloatR[a/Fe]? Log reference {alpha}/Fe abundance ratio (1)log(Sun)phys.abundfloatnullableR[C/Fe]? Log reference C/Fe abundance ratio (1)log(Sun)phys.abundfloatnullableRS/NReference Signal-to-Noise (1)stat.snrfloatLTeffLSSPP effective temperature (2)Kphys.temperature.effectiveintLloggLog LSSPP surface gravity (2)log(cm.s**-2)phys.gravityfloatL[Fe/H]Log LSSPP Fe/H abundance ratio (2)log(Sun)phys.abund.Fe;arith.ratiofloatL[a/Fe]? Log LSSPP {alpha}/Fe abundance ratio (2)log(Sun)phys.abundfloatnullableL[C/Fe]? Log LSSPP C/Fe abundance ratio (2)log(Sun)phys.abundfloatnullableLS/NLSSPP Signal-to-Noise (2)stat.snrfloatSurveySurvey identifier (APOGEE, RAVE, or SEGUE) (3)meta.idcharSDSSDisplay the photometric data from SDSS-DR9 (cat. V/139) within 1.5''meta.ref.urlcharSloanDisplay the SDSS data within 1.5''meta.ref.urlchar_RAPosition from LAMOST name (right ascension part)degpos.eq.ra;meta.main_DEPosition from LAMOST name (declination part)degpos.eq.dec;meta.main