Blue horizontal-branch stars from LAMOST J/ApJS/276/12 ivo://CDS.VizieR/J/ApJS/276/12 doi:10.26093/cds/vizier/bb-8m-c CDS Ju J. Zhang Bo Cui W. Huo Z. Liu C. Huang Y. Shi J. 2026-08-03T07:25:55Z 2025-12-04T08:36:37Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr horizontal-branch-stars visible-astronomy spectroscopy metallicity Blue horizontal-branch (BHB) stars are crucial for studying the structure of the Galactic halo. Accurate atmospheric parameters of BHB stars are essential for investigating the formation and evolution of the Galaxy. In this work, a data-driven technique named Stellar Label Machine (SLAM) is used to estimate the atmospheric parameters of Large Sky Area Multi-Object Fiber Spectroscopic Telescope low-resolution spectra for BHB stars with a set of A-type theoretical spectra as the training data set. We add color indexes ((BP-G), (G-RP), (BP-RP), (J-H)) during the training process to constrain the stellar temperature further. Finally, we derive the atmospheric parameters (Teff, logg, [Fe/H]) for 5355 BHB stars. Compared to existing literature results, our results are more robust, and after taking the color index into account the resulting precision of Teff and logg is significantly improved, especially for the spectrum with a low signal-to-noise ratio (S/N). Based on the duplicate observations with an S/N difference <20%, the random errors are around 30K, 0.1dex, and 0.12dex for Teff, logg, and [Fe/H], respectively. The stellar labels provided by SLAM are also compared to those from the high-resolution spectra in the literature. The standard deviation between the predicted star labels and the published values from the high-resolution spectra is adopted as the statistical uncertainty of our results. They are {sigma}(Teff)=76K, {sigma}(logg)=0.04dex, and {sigma}([Fe/H])=0.09dex, respectively. 2025ApJS..276...12J https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/276/12 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006) J/AJ/103/267 : Spectroscopy of hot stars in galactic halo (Beers+ 1992) J/AJ/117/2308 : Spectroscopy of hot stars in the halo (Wilhelm+, 1999) J/A+A/364/102 : Abundances of field BHB star candidates (Kinman+, 2000) J/AJ/127/899 : Blue HB stars in SDSS (Sirko+, 2004) J/ApJ/684/1143 : BHB candidates in the Milky Way (Xue+, 2008) J/ApJ/738/79 : SDSS-DR8 BHB stars in the Milky Way's halo (Xue+, 2011) J/ApJ/808/16 : Cannon: a new approach to determine abundances (Ness+, 2015) J/ApJS/226/1 : Carbon stars from LAMOST DR2 data (Ji+, 2016) J/AcA/66/405 : Gal. bulge eclipsing & ellipsoidal binaries (Soszynski+, 2016) J/ApJS/232/16 : Mira stars discovered in LAMOST DR4 (Yao+, 2017) J/ApJS/234/31 : Carbon stars from LAMOST using machine learning (Li+, 2018) J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019) J/ApJS/246/9 : Stellar parameters of LAMOST stars using SLAM (Zhang+, 2020) J/A+A/654/A107 : Catalogues of Blue Horizontal Branch Stars (Culpan+, 2021) J/ApJS/257/54 : Early-type star param. from LAMOST LRS & MRS (Guo+, 2021) J/ApJS/253/22 : Ks absolute magnitudes from LAMOST for OB stars (Xiang+, 2021) J/A+A/662/A66 : Hot stars from LAMOST DR6 (Xiang+, 2022) J/A+A/685/A134 : Blue Horizontal Branch stars catalog (Culpan+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/276/12 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/276/12 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/276/12 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/276/12 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/276/12 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/276/12 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/276/12/table1 (The predicted stellar labels of 5355 LAMOST blue horizontal-branch (BHB) stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/276/12/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/276/12/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/276/12/table1? 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27175 27187 27192 27197-27199 27201 27203 27209 27212-27213 27223-27226 27228 27231-27232 27236 27239 27241 27245 27247 27249-27251 27253 27257-27258 27262 27267 27270 27276 27279 27281-27282 27284 27295 27301 27303 27305 27307-27308 27310 27313 27323-27326 27333-27334 27339 27342-27343 27348-27349 27354 27357-27359 27362 27370 27374 27379 27393 27398-27399 27402-27403 27405 27407 27414 27416-27417 27424 27436 27441 27444 27447 27455 27468 27482 27487 27491 27494 27499 27501 27505 27507 27511 27524 27528 27533 27540-27541 27548 27550-27551 27557 27567 27571 27578-27579 27585 27590 27592 27597 27601-27602 27609-27610 27629 27632-27633 27651-27653 27655-27656 27660-27661 27675-27677 27679-27680 27684 27686 27690 27696 27706 27712-27713 27718 27725 27727 27736-27738 27740 27744 27748 27750-27751 27757 27759 27767-27768 27771 27778 27792 27797-27798 27816 27818-27819 27821 27823 27828 27839 27845 27863-27864 27866 27868 27870 27889 27898-27899 27910-27911 27915-27916 27919 27922 27925 27932 27936 27941 27944 27949 27956 27960-27962 27966 27972 27975 27977 27981 27983 27988 27991-27992 27994-27995 27997 28000-28001 28003 28005 28007-28008 28011-28012 28020 28024 28027-28028 28030 28033 28036-28037 28040 28042 28045 28051 28054 28056 28064 28066-28067 28073 28082 28086 28088-28090 28093 28100 28112 28117-28118 28125-28126 28135 28138 28142 28150 28154-28155 28159-28161 28165 28168-28170 28177-28178 28190 28192-28193 28195 28198-28199 28201 28208 28215 28221 28227 28234-28235 28241 28244-28246 28254 28261 28263-28264 28267-28269 28273-28275 28278 28281-28284 28296 28298 28300 28306-28307 28312 28314 28316-28318 28325 28328-28329 28331-28332 28335 28347 28354 28356 28359-28360 28368-28369 28371-28372 28376 28380 28384 28387 28389 28394 28396 28399 28401 28403-28405 28407 28411 28413 28420-28421 28429 28433 28440 28442-28443 28445-28447 28452 28460 28462-28463 28468-28469 28473 28477 28479 28482 28484-28485 28490 28492-28493 28498 28500 28503 28505 28508 28510 28512-28514 28520 28523-28525 28527 28533 28535-28536 28538 28540-28542 28553-28554 28556 28558 28560 28563-28565 28571 28575 28577 28581 28583-28584 28586 28589-28591 28594-28595 28597 28599 28602 28606 28610 28612 28616 28620 28623-28625 28627 28630-28631 28634 28638 28643 28651 28656 28665 30847 30911 30919 30924 30926-30928 30930 30932 30936-30938 30941-30943 30955 30958 30965-30966 30970 30972 31035-31038 31080 31082-31083 31107 31110 31112 31117 31125-31126 31129 31146-31147 31155-31157 31162 31167-31168 31170-31171 31174 31176-31177 31179-31180 31182-31183 31193 31196 31204 31206-31209 31211-31212 31218-31219 31222-31223 31227 31229 31231 31253 31255 31260-31261 31287 31293-31296 31298-31301 31305 31308-31309 31312 31314-31315 31317 31319 31325 31327 31330 31333-31335 31340 31342-31343 31346 31349 31354 31370 31372 31375 31379 31382-31384 31388 31390 31395 31399-31400 31402-31404 31407-31410 31414-31415 31422 31432-31433 31435-31437 31442-31443 31445-31447 31450-31451 31453 31455 31460 31462 31466-31468 31470 31472 31476-31477 31479-31481 31484 31488-31490 31494 31496 31498-31499 31502 31505 31509-31510 31512-31513 31515 31517-31519 31526 31528 31531 31534 31536 31538-31542 31551-31552 31561-31562 31573 31575 31583 31592 31596 31604 31606 31612 31614-31618 31620 31622-31626 31628 31630-31632 31635 31638 31640 31642-31643 31653-31654 31657 31660-31661 31664-31666 31670 31673 31675-31676 31679 31682 31684 31705-31706 31708 31710 31717 31725 31728 31731 31733 31739 31741-31742 31883 31886 31905 31912 31915-31916 31919-31920 31922 31925-31926 31932-31933 31976 31983 31992 31998 32269-32270 32272 32277-32278 32290-32292 32294 32296-32297 32299 32302 32306-32307 32309 32312 32316-32317 32324 32326 32328 32331 32334-32335 32349-32351 32353 32355-32358 32365 32369 32372-32374 32377-32378 32383 32389-32393 32401-32403 32407 32412-32414 32416 32436-32437 32439 32441-32442 32458 32460 32463 32470 32486 32492-32493 32497-32500 32502 32505 32507 32510 32512-32513 32521 32523 32525-32527 32544-32545 32547-32550 32555 32558 32570 32610 32640 32647 32659 32671 32690 32692 32714 32718 32722 32729 32731-32732 32734 32743-32744 32752-32753 32757 32759 32762-32763 36815 36817 36853-36854 36858-36861 40893 40907 40921-40924 40937 40939 40948 40956 40959 45019 45021-45022 45034-45036 45038 45041 45044 45047 45049 45052-45054 48989 48999 49007 49018 49095 49105 49108 49110-49111 49117 49119 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/276/12?format=ascii Optical default J/ApJS/276/12/table1 The predicted stellar labels of 5355 LAMOST blue horizontal-branch (BHB) stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ObsID [107128/585113083] LAMOST spectrograph identifier meta.id;meta.main long RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main DEJ2000 [-10/62] Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main SN [10/988] Signal to noise in the g band stat.snr;instr.bandpass float Teff [4496/12806] Effective temperature K phys.temperature.effective double log(g) [1.47/5.68] log surface gravity log(cm.s**-2) phys.gravity float [Fe/H] [-4.04/1.14] Metallicity log(Sun) phys.abund.Z float