Barium abundances from LAMOST MRS DR9 spectra J/ApJS/278/23 ivo://CDS.VizieR/J/ApJS/278/23 doi:10.26093/cds/vizier/bb-8p-q CDS Chen T.-Y. Shi J.-R. Yan H.-L. Beers T.C. Li C.-Q. Ding M.-Y.,Xie X.-J. Shuai L. Zhou Z. Tang Y.-J. 2026-08-03T07:26:25Z 2026-03-09T13:03:09Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr chemical-abundances visible-astronomy spectroscopy surveys Based on a template-matching method, we estimate the barium (Ba) abundances for stellar spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium-Resolution Spectroscopic Survey (MRS). The Ba abundances of 198,011 stars have been determined from MRS spectra with signal-to-noise ratios (S/N)>40 combined with the stellar atmospheric parameters from the LAMOST Low-Resolution Spectroscopic Survey DR9 by the LAMOST Stellar Parameter Pipeline. The uncertainties in the Ba abundances from the LAMOST MRS spectra are less than 0.3 dex when S/N exceeds 40, which align closely with the results based on the high-resolution UVES spectra from the Gaia-ESO survey obtained by spectral synthesis. Further analysis of Ba abundances from repeated observations of the same stars reveals that random errors related to spectral quality remain below 0.3 dex at the same S/N, with a systematic overestimation for the low-S/N spectra. This extensive sample of stellar Ba abundances will enhance studies of the s-, i-, and r-processes, and deepen our understanding of the chemical-evolution history of the Milky Way. 2025ApJS..278...23C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/278/23 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to V/162 : LAMOST DR11 catalogs (Luo+, 2026) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/ApJ/617/1091 : La and Eu abundances in 85 stars (Simmerer+, 2004) J/MNRAS/404/1529 : s-process in low-metallicity stars (Bisterzo+, 2010) J/ApJ/787/10 : Solar s-process contrib. with GCE model (Bisterzo+, 2014) J/MNRAS/448/822 : LAMOST candidate members of star clusters (Xiang+, 2015) J/other/RAA/16.G10 : [alpha/Fe] ratios from LAMOST spectra (Li+, 2016) J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016) J/ApJ/833/225 : -2.6<=[Fe/H]<=0.2 F & G dwarfs. II. Abundances (Zhao+, 2016) J/A+A/606/A94 : Chemical abundances of 1059 FGK stars (Delgado Mena+, 2017) J/ApJ/869/50 : Barium abundances of red giant branch stars (Duggan+, 2018) J/ApJS/234/31 : Carbon stars from LAMOST using machine learning (Li+, 2018) J/MNRAS/490/2219 : s-process enhanced stars in LAMOST (Norfolk+, 2019) J/ApJS/245/34 : Abund. for 6 million stars from LAMOST DR5 (Xiang+, 2019) J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021) J/ApJ/914/116 : Lithium abundances from LAMOST MRS. I. (Gao+, 2021) J/ApJS/271/58 : Lithium abundances from LAMOST MRS DR9 spectra (Ding+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/278/23 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/278/23 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/278/23 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/278/23 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/278/23 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/278/23 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/278/23/table1 (Barium abundances from LAMOST MRS DR9) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/278/23/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/278/23/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/278/23/table1? 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22310-22311 22313-22315 22322-22323 22332 22334-22335 22352-22353 22355 22361 22364-22365 22367 22375 22381 22383 22408-22410 22413 22432 22434-22435 22448-22449 22464 22466-22467 22469 22488-22489 22491 22496 22516 22771 22774-22775 22803 22806-22807 22809-22811 22833 22835 22844-22845 22849-22851 22870 22888-22889 22891 22906-22909 22952 22954-22955 22977 22979 22985 22996 22998 23004 23006-23007 23013 23024-23025 23037 23105-23107 23132-23133 23136-23137 23139-23140 23142-23143 23149 23304-23305 23311 23322-23323 23326 23333-23335 23340-23341 23343 23400 23402 23418-23419 23422-23423 23429 23440-23441 23443-23446 23453 23455 23459 23462-23465 23467 23474 23477 23479-23480 23482-23483 23485 23487 23492 23494-23495 23564 23566 23569 23572-23573 23588 23590-23591 23608 23610 23616-23617 23620 23633 23635 23644-23645 23661-23663 23678-23679 23684 23686 23688-23689 23692-23693 23704 23724 23729 23731 23734-23735 23784 23786-23789 23796 23807 23812 23814 23840-23841 23843-23844 23849 23851-23852 23854 23859 23865 23867 23875 23881 23883 23894 23900 23902 23924 23936-23937 23939 23945 23947 23969 24064-24065 24071 24076-24077 24079 24101 24106-24107 24112-24113 24115-24117 24136 24155 24157-24159 24196 24198-24199 24219 24222-24223 24228-24230 24263 24265-24267 24269-24271 24282 24287 24312 24352 24356-24357 24359 24367 24416-24418 24420-24421 24429-24431 24433 24436-24437 24451 24457-24459 24476-24478 24480-24482 24489-24491 24502-24503 25703 25709-25711 25718-25719 25797 25799 25823 25898 25984 25986 25990-25992 25994-25995 26004 26006-26007 26032-26033 26035-26038 26040 26042-26043 26078-26079 26100-26101 26103 26108-26109 26111 26157-26159 26174-26175 26189 26195-26196 26198-26199 26224-26225 26227 26237 26253 26255 26260-26262 26277 26279 26285 26300-26302 26305 26307 26310 26316 26318-26319 26340 26372-26374 26384-26385 26387 26392 26394 26408-26409 26411 26491 26494-26495 26500-26501 26512 26609 26617-26619 26973 26975 26979-26980 26982-26983 27031 27037 27039 27104-27105 27116-27117 27119 27132-27134 27142 27145 27147 27154 27169 27171 27177 27179 27188 27190 27196 27198 27241-27243 27249-27252 27254-27255 27265 27284-27285 27287 27293 27352-27354 27365 27405 27407 27409-27412 27414-27415 27426 27432 27434 27449 27451 27458 27462-27463 27474 27508 27510 27516 27518 27520 27522 27540-27541 27581-27583 27596-27597 27600-27601 27603-27604 27606 27608-27609 27623 27634-27635 27638 27649 27651 27666 27692 27694-27696 27698 27743 27765 27767 27784-27785 27788 27861-27863 27893 27899 27910 27926-27928 27930 27948-27950 27952 27954 27956-27957 27959-27960 27972 27974-27975 28009 28036 28038 28050-28051 28054 28064-28065 28068-28069 28080-28081 28083-28086 28105-28107 28129 28132-28133 28135 28152-28154 28185 28187 28197 28199 28212-28213 28215 28232 28234-28235 28237 28239 28252 28254-28255 28272 28277-28279 28293 28295 28308-28310 28317 28319 28334-28335 28337-28339 28354-28355 28358 28360-28362 28364-28365 28367 28378 28383 28400 28402 28421 28426 28448 28462 28476-28477 28545-28547 28553-28555 28609 28660-28661 28663 28668-28670 30847 30908-30909 30911 30933 30954-30955 30958-30959 31016 31018-31020 31022-31023 31034 31093 31101 31103 31120 31227 31229-31231 31253 31255 31300-31302 31305 31308 31399 31403-31404 31406-31407 31410 31418-31419 31422 31479 31569 31571 31580-31581 31583 31605 31648 31650-31651 31654 31681-31683 31698 31712-31713 31715 31725 31728-31730 31736 31753-31756 31758-31759 31792 31794-31795 31800 31802-31803 31888 31890 31927-31928 31930-31931 31970-31971 31974 32179 32181 32183 32185 32187 32232 32234-32235 32250 32284-32286 32304-32305 32328-32329 32332-32333 32368-32369 32371 32380-32381 32383 32413 32415 32428 32430-32431 32435 32446 32451 32454 32469 32471 32489-32494 32514-32515 32529 32538-32542 32564 32566-32567 32581 32583-32584 32587 32589-32591 32598 32612-32613 32615-32616 32618-32619 32628-32629 32631-32633 32676-32677 32679 32696-32697 32699 32704-32706 32712 32714-32715 32754-32757 32764 32766-32767 44979 44982 44984-44985 44987-44988 44990 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/278/23?format=ascii Optical default J/ApJS/278/23/table1 Barium abundances from LAMOST MRS DR9 recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST MRS DR9 Position-based Designation meta.id;meta.main char GaiaDR3 ? Gaia DR3 source identifier meta.id nullable RAJ2000 Right Ascension (J2000) (1) deg pos.eq.ra;meta.main indexed DEJ2000 [-9.3/61.2] Declination (J2000) (1) deg pos.eq.dec;meta.main indexed Teff [3785/7999] Effective temperature K phys.temperature.effective int logg [0.02/4.9] Log, Surface gravity log(cm.s**-2) phys.gravity float FeH [-2.5/0.5] Metallicity, [Fe/H] phys.abund.Z float SN [40/632] Spectrum signal-to-noise per pixel stat.snr;instr.pixel int BaFe [-1/2.9] Relative barium abundance (to iron), [Ba/Fe] phys.abund float delta [0/2.8]? Maximum difference in [Ba/Fe] derived from repeated observations phys.abund;arith.diff;stat.max double nullable sigma [0/1.4]? Standard deviation of [Ba/Fe] derived from repeated observations stat.stdev;phys.abund double nullable d-T+100 [-6.1/5.2]? Change of [Ba/Fe] caused by Teff+100K arith.diff;phys.abund double nullable d-logg+0.25 [-4.92/4.63]? Change of [Ba/Fe] caused by logg+0.25 arith.diff;phys.abund double nullable d-feh+0.1 [-3.1/2.7]? Change of [Ba/Fe] caused by [Fe/H]+0.1 arith.diff;phys.abund double nullable d-xi+0.3 [-11.3/1.1] Change of [Ba/Fe] caused by xi+0.3 arith.diff;phys.abund float