Chemically peculiar stars CP1 & CP2 from LAMOST J/ApJS/259/63 ivo://CDS.VizieR/J/ApJS/259/63 doi:10.26093/cds/vizier.22590063 CDS Shang L.-H. Luo A.-L. Wang L. Qin Li Du B. He X.-J. Cui X.-Q.,Zhao Y.-H. Zhu R.-H. Zhi Q.-J. 2023-11-13T07:48:18Z 2022-07-28T08:05:51Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr peculiar-variable-stars visible-astronomy spectroscopy metallicity stellar-spectral-types In the eighth data release (DR8) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, more than 318,740 low-resolution stellar spectra with types from B to early F and signal-to-noise ratios >50 were released. With this large volume of the early-type stars, we tried machine-learning algorithms to search for class-one and class-two chemical peculiars (CP1 and CP2), and to detect spectral features to distinguish the two classes in low-resolution spectra. We selected the XGBoost algorithm after comparing the classification efficiency of three machine-learning ensemble algorithms. Using XGBoost followed by the visual investigation, we presented a catalog of 20694 sources, including 17986 CP1 and 2708 CP2, in which 6917 CP1 and 1652 CP2 are newly discovered. We also list the spectral features to separate CP1 from CP2 discovered through XGBoost. The stellar parameters (including effective temperature (Teff), surface gravity (log g), metallicity [Fe/H]), the spatial distribution in Galactic coordinates, and the color magnitude were provided for all of the entries of the catalog. The Teff for CP1 distributes from ~6000 to ~8500K, while for CP2 it distributes from ~7000 to ~13700K. The log g of CP1 ranges from 2.8 to 4.8dex, peaking at 4.5dex, and of CP2 it ranges from 2.0 to 5.0dex, peaking at 3.6dex, respectively. The [Fe/H] of CP1 and CP2 are from -1.4 to 0.4dex, and the [Fe/H] of CP1 are on average higher than that of CP2. Almost all of the targets in our sample locate around the Galactic plane. 2022ApJS..259...63S https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/259/63 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/162 : General Catalogue of Ap and Am stars (Renson+ 1991) III/260 : General Catalogue of Ap and Am stars (Renson+ 2009) V/146 : LAMOST DR1 catalogs (Luo+, 2015) V/156 : LAMOST DR7 catalogs (Luo+, 2019) J/A+A/441/631 : {Delta}a photometry of CP stars (Paunzen+, 2005) J/A+A/475/1053 : Magnetic fields in Ap/Bp stars (Auriere+, 2007) J/MNRAS/449/1401 : Am stars candidates from LAMOST DR1 (Hou+, 2015) J/AJ/151/13 : LAMOST-Kepler MKCLASS spectral classification (Gray+, 2016) J/ApJ/836/77 : A library of high-S/N optical sp. of FGKM stars (Yee+, 2017) J/MNRAS/480/2953 : Catalogue of CP stars (HgMn, ApBp, AmFm) (Ghazaryan+, 2018) J/A+A/640/A40 : 1002 mCP stars from LAMOST DR4 (Hummerich+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/259/63 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/259/63 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/259/63 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/259/63 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/259/63 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/259/63 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/259/63/table1 (The catalogs of metallic-line or Am stars (CP1) & magnetic Bp/Ap/CP2 stars (CP2) stars in the LAMOST DR8) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/259/63/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/259/63/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/259/63/table1? 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15156-15158 15160 15172 15176-15178 15180 15182 15184 15191 15196-15197 15200 15202 15266 15273 15281 15288 15298 15361 15363 15366 15369 15372 15392-15393 15403 15406 15425 15429-15431 15435 15438-15441 15443 15451 15461 15472 15474 15493-15494 15497 15499 15797 15872 15876 15878-15879 15882-15883 15885-15886 17717 17724 17738 17745 17749 17757 17767 17784 17852 17854 17857 17867 17875 17881 17908 18006 18015 18039 18083 18085-18086 18107 18118 18129 18133-18134 18175 18186 18210 18219 18224 18232 18242 18259 18264 18270 18282 18311 18323 18330 18335 18343-18344 18352 18354 18356 18407 18410 18413 18419 18426 18668-18669 18671 18687 18788 18811 18815 18841 18854 18869 18883 18889 18891 18900 18907 18921-18922 18945 18952 18954 18979 18982-18983 18987 19026 19028 19034 19040 19043 19051 19065 19080 19102 19149 19155 19157 19163 19181 19188 19197-19198 19216 19218-19219 19221 19229 19248 19251 19259 19262 19295 19297 19299 19307 19309 19315 19360 19370 19385-19386 19388-19389 19398 19408 19437-19438 19441-19442 19445 19450 19479 19482-19483 19489 19494 19509 19516-19517 19535 19566 19576 19592 19602 19612 19621-19623 19666-19667 19697 19702 19705 19708 19760 19778 19800 19871 19875 19881 19887-19888 19901 19905 19907 19911 19917 19922 19930 19934-19935 19943-19944 19950 19957 19959 19961 19966-19967 19970 19974 20001 20008 20010 20023 20065 20068 20072-20073 20076-20077 20079 20088 20096 20102 20109 20117 20128 20133 20141 20146-20148 20154-20155 20163 20167-20168 20173-20174 20177 20185 20187 20191 20197 20206 20240 20242 20248 20250 20260 20271 20274 20280 20283-20284 20289 20292 20294-20295 20298 20300 20302 20304-20305 20309 20311 20318 20320 20337-20340 20342 20346 20353 20359 20362 20367 20373 20378 20380 20387-20388 20392 20396 20400 20421 20423 20426-20427 20429 20434-20437 20439 20442-20443 20447-20450 20452 20457 20459-20461 20466-20468 20474 20476-20477 21368 21370-21371 21434 21443 21446-21447 21449 21460 21462 21473 21478 21482-21485 21591 21597 21599 21619 21621-21623 21625 21627-21630 21694-21695 21710-21711 21713 21717-21719 21722-21723 21725-21727 21731 21736-21738 21741 21743 21748 21750-21751 21766-21767 21776-21777 21779-21780 21782 21788 21791 21805 21807 21820-21822 21825 21828 21831-21832 21835 21840-21841 21843 21845 21847 21849-21852 21854 21860-21862 21869-21871 21874 21876-21877 21879-21882 21885 21887 21889-21891 21897 21900-21901 21903 21905-21908 21910-21911 21916 21918-21919 21925 21927 21937-21939 21945-21947 21953 21955-21956 21958-21960 21962-21963 21969-21972 21974-21975 21977-21979 21988 21993-21995 22000-22001 22003-22005 22007 22013-22015 22034-22035 22037 22044 22046-22047 22061-22063 22068-22069 22071 22073-22075 22080-22081 22083-22085 22089 22091 22128 22130-22133 22135 22140-22142 22154-22155 22157-22159 22161 22163 22168 22171 22182-22183 22217-22219 22228 22230-22231 22244-22245 22247 22288-22290 22312-22314 22336 22338-22339 22345 22347 22352 22354 22356 22358-22362 22364 22366 22368 22370-22371 22374-22375 22380 22382-22383 22396 22398-22399 22401-22403 22485 22487 22512-22513 22515 22520-22521 22523-22526 22730-22731 22746-22748 22758-22759 22764 22771 22777 22782-22783 22790-22791 22800 22802-22803 22806 22809 22813 22815 22836-22837 22844-22845 22850 22852 22854 22856-22857 22859-22860 22862-22865 22867 22872 22875 22878-22881 22883 22885-22889 22892 22894-22896 22898-22899 22901 22903 22905-22907 22913-22916 22918 22923 22942 22944-22945 22947 22955-22956 22961-22965 22968-22969 22971 22974-22975 22979 22981-22983 22988-22989 22991 23000 23002-23005 23007 23010 23013 23019 23024-23025 23028-23029 23098 23108-23109 23123-23124 23126 23129 23143 23149 23152 23158 23167 23182 23186 23197 23201-23202 23206 23222 23231 23233-23234 23238 23242 23244 23246 23252 23256 23260 23267-23269 23272-23273 23278 23282 23284 23288 23292-23294 23296 23305 23309 23311 23317 23320 23324 23326-23327 23329 23331 23335 23337 23339-23340 23344 23346-23347 23360 23363 23366-23367 23377 23385 23387 23391 23394 23396-23397 23399 23401-23402 23405 23408-23410 23416 23419 23426-23428 23435 23443-23446 23455 23457-23458 23464 23466 23473-23474 23476 23479 23482-23483 23486-23488 23493 23495-23496 23502 23507 23510-23512 23515 23517-23518 23524 23526 23528 23531-23532 23535 23537-23539 23541-23546 23548 23550 23560 23562 23564-23565 23567 23589 23592-23593 23596-23597 23609-23611 23630-23631 23633 23636 23638 23644-23645 23680 23682 23686-23687 23692 23694-23695 23712-23713 23715 23721 23723 23736-23737 23804-23806 23841-23843 23892 23894-23895 23924 23926-23927 24065 24067-24069 24071 24074-24078 24096 24099-24100 24102-24106 24108 24110-24111 24120-24121 24123 24184-24185 24187 24192 24194 24197-24198 24200-24202 24204-24205 24207-24208 24211 24213-24215 24217-24219 24225-24227 24229-24230 24232 24235 24261-24263 24272-24273 24277 24282 24300 24303-24304 24311 24314 24317 24319 24373-24375 24453-24455 24457-24459 24540-24542 24552-24553 24555 24573-24575 25423 25439 25468 25559 25718 25773 25819 25892 25916 25927 25941-25942 25962 25968-25969 25986 26000 26014 26017 26027 26036 26053 26081 26086 26123 26148 26164 26182 26229 26253 26281-26283 26285 26295 26302 26330 26378 26380 26397 26404 26406 26418 26440 26448 26472-26473 26488 26516 26554 26566-26567 26575-26576 26745 26839 26855 26866 26906 26915 26931 26937 26939 26956 26975 26980 26994 27017 27025 27032 27041 27043 27052 27065 27092-27093 27098 27102 27112 27119-27120 27125 27144-27145 27147-27148 27156 27158 27160 27175 27182-27183 27187 27196 27204 27210 27231-27232 27234 27242 27256 27266-27268 27271-27272 27275 27277 27282 27285-27286 27291 27300-27301 27303-27304 27307-27308 27310 27312 27314-27315 27317 27321 27328 27336 27338 27341 27347 27359 27361 27370 27376 27380 27414-27415 27436 27438 27443 27450 27479 27487-27488 27501 27511 27525 27533 27537 27562 27600 27608 27624 27651 27657 27660 27662 27682 27686 27711 27727-27728 27741 27747 27753 27761 27764 27810 27845 27857-27858 27878 27905-27906 27933 27937 27946 27957 27973 27986 27988 27990 28035 28047 28055 28057 28097 28100 28102 28142 28149 28181 28190 28192 28235 28285 28294 28326 28365 28370-28371 28386-28387 28397 28412 28435 28446 28469 28481 28484 28521 28526 28537 28579 28590-28591 28600 28609 29683-29684 29686 29693 29695 29927 29937-29939 29945 29947-29948 29950 30173 30175 30204-30205 30291 30301 30350 30365 30375 30380 30382 30389-30393 30395 30399 30404-30405 30409 30412 30432-30433 30437-30440 30442-30445 30456 30458 30466 30470 30473-30476 30479 30499 30501-30502 30559 30573 30575 30578 30582-30583 30585-30586 30589-30590 30673-30675 30684-30685 30932 30940 30959 31005 31018 31023 31027 31031 31036 31043 31046-31048 31053 31055 31058 31060-31061 31063-31064 31067 31077 31079 31082 31092 31095 31101-31102 31107 31110-31111 31113 31119 31121 31124-31125 31128-31129 31134 31141 31147 31150 31168-31169 31171 31176-31177 31180 31185 31189 31193 31207 31217 31219 31223 31225 31228 31231 31249 31252 31260 31293 31299 31302-31303 31312 31336 31379 31387 31396 31408 31436 31445 31461 31466 31487 31489 31494 31498 31500 31510-31511 31519 31536 31547 31568 31573 31576 31592 31599 31607 31624 31631 31641 31676 31679 31682 31690 31703 31709 31720 31722 31732-31733 31742 31756 31759 31761-31764 31770 31773 31776 31778-31782 31785 31792 31795 31800-31802 31805 31808 31816-31817 31819 31821-31823 31832 31834 31836 31838 31841-31842 31844-31845 31848 31854-31858 31860 31863 31867 31869 31871-31872 31875 31877-31878 31885 31887 31889 31891-31893 31898 31903 31905 31910 31912-31913 31917 31921-31922 31927 31930 31938 31948 31950-31952 31954 31956-31957 31960-31961 31964-31966 31976 31978-31979 31981-31982 31986 31988-31989 31995-31997 31999-32000 32008 32010 32034 32040-32041 32043 32046 32055 32061-32062 32104-32105 32126-32127 32132 32134 32140 32143 32153 32156 32162 32169-32171 32173-32174 32184 32186 32189-32190 32198 32204 32214 32223 32235 32244-32245 32251 32253-32255 32261 32267 32276 32279-32280 32282 32288 32292 32294 32298 32300-32301 32323-32326 32330-32331 32344 32352 32357-32358 32364 32370-32371 32374 32376-32377 32388 32400 32407 32409 32411 32414 32418 32434 32437 32450 32458 32460 32463 32477 32500 32516-32517 32520 32523-32526 32528-32529 32531-32532 32534-32535 32540 32546 32549 32551 32553-32554 32556 32558 32562 32564 32568 32570 32577 32588 32594 32596 32601 32614 32621 32624 32627 32656 32659 32666-32667 32677 32680 32695 32700 32704 32711 32730 32738-32739 32752 32755 32761-32762 36807-36808 36847 36850 36852 36857-36858 36863 40859 40863 40886-40887 40890-40891 40893 40918 40921 40924 40929 40931 40933 40940-40941 40943-40945 40953-40954 40959 45041 49007 49095 49104-49105 49108 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/259/63?format=ascii Optical default J/ApJS/259/63/table1 The catalogs of metallic-line or Am stars (CP1) & magnetic Bp/Ap/CP2 stars (CP2) stars in the LAMOST DR8 Qual Data quality (2) meta.code.qual char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST identifier (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-10/87.3] Declination (J2000) deg pos.eq.dec;meta.main indexed Teff [6000/15729] Effective temperature K phys.temperature.effective double e_Teff [124/623] Uncertainty in Teff K stat.error;phys.temperature.effective float logg [2.75/4.75] log surface gravity log(cm.s**-2) phys.gravity float e_logg [0.12/0.8] Uncertainty in logg log(cm.s**-2) stat.error float [Fe/H] [-1.4/0.4] Metallicity log(Sun) phys.abund.Z float e_[Fe/H] [0.08/0.5] Uncertainty in [Fe/H] log(Sun) stat.error;phys.abund.Fe float SpTLA LAMOST derived spectral type src.spType char SpTMKC MKCLASS code derived spectral type (1) src.spType char Type Subclass of CP type stars ("CP1" or "CP2") meta.code char Note Additional note (3) meta.note char CPCat Display data from Hummerich+, 2020, J/A+A/640/A40; Hou+ 2015, J/MNRAS/449/1401 and Renson+, 2009, III/260 within 3" meta.ref.url int nullable Simbad Simbad column added by the CDS meta.ref.url char