J/ApJ/836/5ivo://CDS.VizieR/J/ApJ/836/5doi:10.26093/cds/vizier.18360005CDSHo A.Y.Q.Ness M.K.Hogg D.W.Rix H.-W.Liu C.Yang F.Zhang Y.,Hou Y.Wang Y.2017-11-06T13:58:36Z2017-10-05T14:31:17ZCDS support team

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

cds-question@unistra.frchemical-abundancesgiant-starssurveysspectroscopyIn this era of large-scale spectroscopic stellar surveys, measurements of stellar attributes ("labels," i.e., parameters and abundances) must be made precise and consistent across surveys. Here, we demonstrate that this can be achieved by a data-driven approach to spectral modeling. With The Cannon, we transfer information from the APOGEE survey to determine precise T_eff_, logg, [Fe/H], and [{alpha}/M] from the spectra of 450000 LAMOST giants. The Cannon fits a predictive model for LAMOST spectra using 9952 stars observed in common between the two surveys, taking five labels from APOGEE DR12 as ground truth T_eff_, logg, [Fe/H], [{alpha}/M], and K-band extinction A_k_. The model is then used to infer T_eff_, logg, [Fe/H], and [{alpha}/M] for 454180 giants, 20% of the LAMOST DR2 stellar sample. These are the first [{alpha}/M] values for the full set of LAMOST giants, and the largest catalog of [{alpha}/M] for giant stars to date. Furthermore, these labels are by construction on the APOGEE label scale; for spectra with S/N>50, cross-validation of the model yields typical uncertainties of 70K in T_eff_, 0.1 in logg, 0.1 in [Fe/H], and 0.04 in [{alpha}/M], values comparable to the broadly stated, conservative APOGEE DR12 uncertainties. Thus, by using "label transfer" to tie low-resolution (LAMOST R~1800) spectra to the label scale of a much higher-resolution (APOGEE R~22500) survey, we substantially reduce the inconsistencies between labels measured by the individual survey pipelines. This demonstrates that label transfer with The Cannon can successfully bring different surveys onto the same physical scale.2017ApJ...836....5Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/149 : LAMOST DR2 catalogs (Luo+, 2016)III/272 : RAVE 4th data release (Kordopatis+, 2013)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)III/218 : ELODIE archive (Prugniel+, 2001)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/ApJ/708/1628 : Diffuse interstellar bands. IV. (McCall+, 2010)J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)J/A+A/525/A71 : Atmospheric parameters for 1273 stars (Wu+, 2011)J/AJ/146/133 : Stellar parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)J/AJ/150/187 : Abundances and stellar parameters of LAMOST stars (Lee+, 2015)J/ApJ/798/110 : Equivalent widths of LAMOST metal-poor stars (Li+, 2015)J/ApJ/808/16 : The Cannon: a new approach to determine abundancesJ/other/RAA/16.G10 : [alpha/Fe] ratios from LAMOST spectra (Li+, 2016)J/AJ/152/6 : Param. of Kepler stars using LAMOST+seismic data (Wang+, 2016)http://www.github.com/annayqho/TheCannon/ : The Cannon code in Pythonhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/836/5/table1 (Stellar labels (Teff, logg, [Fe/H], and [{alpha}/M]) for 454180 stars, inferred by The Cannon directly from LAMOST spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/5/table1?GETtext/xml+votable180.050000true331.916822-1.7825920.0055555555555555563/13 16 18 19 20 24 34 37 40 41 76 79 98 104 140 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27598 27613 27615 27621 27622 27623 27672 27674 27675 27676 27677 27678 27688 27689 27690 27693 27695 27700 27702 27703 27718 27719 27801 27802 27803 27834 27835 27920 27922 27923 27925 27926 27927 27936 27937 27939 27944 27945 27947 27952 27953 27954 27962 28020 28021 28028 28030 28036 28037 28038 28050 28051 28055 28097 28098 28099 28112 28113 28114 28144 28145 28147 28200 28201 28203 28208 28210 28212 28213 28224 28226 28227 28229 28236 28240 28241 28243 28249 28250 28251 28252 28253 28255 28256 28261 28263 28269 28270 28271 28280 28281 28283 28284 28285 28286 28308 28310 28311 28320 28322 28328 28329 28330 28357 28358 28359 28364 28365 28367 28372 28373 28380 28382 28383 28384 28386 28387 28417 28425 28426 28427 28448 28450 28452 28453 28455 28456 28461 28462 28463 28540 28541 28542 28545 28547 28553 28554 28555 28648 28650 28651 28660 28661 28663 28664 28665 28666 28668 28669 28671 30887 30893 30894 30895 30898 30899 30902 30954 30955 30970 30971 30974 30975 30998 30999 31001 31002 31003 31024 31025 31027 31033 31048 31050 31051 31054 31055 31066 31094 31146 31147 31150 31181 31182 31183 31188 31190 31191 31205 31207 31228 31229 31231 31236 31237 31239 31256 31257 31259 31281 31283 31289 31291 31324 31325 31327 31334 31335 31344 31346 31351 31363 31365 31366 31367 31376 31378 31379 31380 31381 31383 31388 31390 31412 31416 31418 31419 31422 31423 31452 31453 31455 31456 31457 31459 31466 31468 31469 31480 31520 31521 31584 31586 31587 31590 31611 31644 31648 31649 31651 31657 31660 31661 31663 31668 31670 31671 31688 31689 31692 31693 31697 31699 31705 31706 31707 31717 31719 31720 31722 31725 31794 31806 31807 31882 31883 31885 31886 31936 31938 31939 31944 31945 31946 31968 31970 31976 31978 32175 32199 32203 32204 32205 32206 32210 32216 32217 32224 32225 32240 32241 32242 32256 32257 32259 32265 32284 32285 32286 32289 32291 32308 32310 32316 32318 32367 32378 32379 32381 32382 32383 32392 32393 32394 32396 32416 32418 32424 32426 32432 32433 32435 32450 32451 32480 32483 32489 32515 32521 32523 32532 32534 32540 32542 32545 32546 32547 32564 32566 32567 32587 32590 32591 32600 32602 32609 32610 32611 32621 32622 32623 32626 32632 32633 32634 32652 32654 32665 32667 32676 32686 32696 32697 32699 32704 32705 32706 32711 32712 32714 32715 32721 32722 32723 32726 36711 36714 36715 36722 36723 36726 36757 36759 36765 36777 36780 36782 36824 36825 36826 36828 36831 36832 36833 36836 36837 36845 36846 36847 36848 36850 36851 36854 36856 36858 36859 40797 40858 40859 40862 40863 40908 40913 40915 40920 40921 40923 40945 40946 40957 40959 45018 45019 45026 48983 48997 48998 48999 49013 49014 49020 49022 49023 49092 49093 49095 49112 49113 49141https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/836/5?format=asciiOpticaldefaultJ/ApJ/836/5/table1Stellar labels (Teff, logg, [Fe/H], and [{alpha}/M]) for 454180 stars, inferred by The Cannon directly from LAMOST spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpecIDLAMOST unique identifier (format "spec-{LMJD}-{PlanId}-sp{spId}-{FiberId}.fits")meta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedTeff[3622/5895] Effective temperatureKphys.temperature.effectivefloate_Teff[2/57094] Teff uncertaintyKstat.error;phys.temperature.effectivefloatlogg[-0.6/5.1] Log of surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.0001/1.7] logg uncertaintylog(cm.s**-2)stat.errorfloat[Fe/H][-2.8/0.9] Abundance of [Fe/H]phys.abund.Fedoublee_[Fe/H][0.00001/1.1] [Fe/H] uncertaintystat.error;phys.abund.Fedouble[a/M][-0.2/0.5] [{alpha}/M] abundancephys.abunddoublee_[a/M][0.00001/0.6] [a/M] uncertaintystat.errordoubleChi2[0.02/10] Reduced {chi}^2^stat.fit.chi2floatDR12Display the SDSS-DR12 photometric catalog (V/147) within 0.5"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar