J/AJ/169/270ivo://CDS.VizieR/J/AJ/169/270doi:10.26093/cds/vizier/be-59-8eCDSLu Z.Kong X.Zhang Y.Yi Z.Liu M.2026-07-02T11:52:04Z2026-02-13T15:36:21ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsam-starsmorgan-keenan-classificationastronomical-modelsvisible-astronomyspectroscopyinfrared-astronomyChemically peculiar (CP) stars, particularly CP1 (metallic-line) and CP2 (magnetic Ap/Bp) stars, are crucial for studying microscopic processes in stellar atmospheres, such as atomic diffusion and magnetic interactions. In this study, we present ODCNNnet, a deep learning-based classification model designed to identify CP1 and CP2 stars from low-resolution spectra. The model achieves an accuracy of 99.81% and a recall of 99.43% for CP1 stars, and an accuracy of 98.82% with a recall of 99.41% for CP2 stars. Applying ODCNNnet to B- to early F-type stars in LAMOST DR11, we identified 33,049 CP1 stars and 5901 CP2 stars, including 5287 newly identified CP1 stars and 1153 newly identified CP2 stars, validated through cross matching with the MKCLASS tool. We further analyzed the stellar parameters of CP stars. The effective temperature (Teff) of CP1 stars ranges from 6000K to 9000K, peaking at 7500K, while CP2 stars span 6000K to 13,000K, with peaks near 8900K and 11,900K. The surface gravity (logg) of CP1 stars is concentrated between 3.4 and 4.6dex, peaking at 3.9dex, while CP2 stars range from 3.5 to 4.6dex. The [Fe/H] of CP1 stars is generally between -1.0 and 0.8dex, peaking around -0.1dex, whereas CP2 stars exhibit a broader distribution from -1.5 dex to 1.0dex, with peaks around -0.25dex and 0.75dex. This study provides a valuable data set for investigating the physical properties of CP stars and their underlying formation mechanisms.2025AJ....169..270Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/270CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)III/162A : General Catalogue of Ap and Am stars (Renson+ 1991)V/162 : LAMOST DR11 catalogs (Luo+, 2026)J/A+A/499/567 : BV differential photometry of HR 7224 (Krticka+, 2009)J/MNRAS/449/1401 : Am stars candidates from LAMOST DR1 (Hou+, 2015)J/AJ/151/13 : LAMOST-Kepler MKCLASS spectral classification (Gray+, 2016)J/MNRAS/480/2953 : Catalogue of CP stars (HgMn, ApBp, AmFm) (Ghazaryan+, 2018)J/ApJS/242/13 : Am stars from LAMOST DR5 (Qin+, 2019)J/A+A/640/A40 : 1002 mCP stars from LAMOST DR4 (Hummerich+, 2020)J/ApJS/259/63 : Chemically peculiar stars CP1 & CP2 from LAMOST (Shang+, 2022)J/ApJ/943/147 : Ap stars from LAMOST DR9 sp. and Gaia DR3 (Shi+, 2023)J/ApJS/266/14 : Am stars selected in LAMOST DR8-DR10 (Tian+, 2023)J/ApJS/272/43 : Am and Ap star candidates from LAMOST DR10 (Yang+, 2024)http://zenodo.org/records/15590979 : Data from this study (Lu+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/270https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/270http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/270https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/270https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/270http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/270GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/169/270/table2 (The Catalogs of CP1 and CP2 Stars in the LAMOST DR11 (v1.0) and DR12 (v0) (revised from Erratum))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/270/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/270/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/270/table2?GETtext/xml+votable180.050000true332.62147531.7682630.0055555555555555562/93 3/23 28 104 350 369 371 377 380-382 4/61 72 74 78-81 83-86 88 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11438 11445 11450 11457 11463 11475 11477 11482 11500 11510-11511 11515-11516 11538-11539 11561 11570 11578 11658 11682 11801 11808 11821 11825 11835 11838-11839 11847 11854 11873 11903 11911 11920 11984-11985 11987 12067 12212 12260 12291-12293 12297 12300 12302 12312 12314 12338 12346-12347 12349 12355-12356 12358-12359 12369-12373 12375 12379-12382 12404 12407 12413 12415 12418-12419 12424 12426-12427 12448 12450-12451 12456 12458-12459 12461 12493 12498 12503 12505-12506 12509 12511 12517 12528-12530 12540 12542-12545 12547 12550 12553 12555 12558-12560 12566 12568-12569 12576-12577 12580 12584-12586 12589-12590 12594 12602 12615 12617 12622 12625-12626 12632 12634 12646 12655-12658 12662-12663 12666-12667 12669 12672 12674-12676 12678-12679 12688-12690 12694 12696 12706-12707 12709-12711 12716 12720-12721 12723-12724 12726 12728-12730 12733-12734 12736 12741 12743 12747-12748 12751 12765 12774 12776 12778 12785 12787 12789 12792-12794 12797 12799 12839 12842 12845-12847 12860 12863 12881 12885 12930 12932 12951 12957 12959 12981 12992 12994 13006 13024 13026 13028-13029 13045 13052 13056-13057 13075-13077 13079 13084 13101 13103-13104 13106 13110 13113-13115 13120-13121 13131 13137 13139 13141-13143 13148 13150-13151 13153 13162-13163 13165 13173-13178 13181 13194-13195 13200 13202-13203 13208-13209 13211 13217-13219 13222 13225-13226 13228-13229 13231 13233-13234 13238-13239 13256 13259 13265-13267 13269-13271 13274-13275 13277-13279 13304 13306 13315-13316 13319 13328 13332 13339-13340 13354-13355 13367 13371 13373-13374 13382 13389 13391-13392 13397-13400 13402 13405 13407 13409-13410 13412 13414 13416-13417 13421-13423 13425-13428 13431-13433 13435-13437 13440 13450 13460 13465 13467-13470 13473-13476 13478-13480 13483-13484 13486 13489-13490 13492 13496 13498 13501 13503-13506 13513-13515 13517-13518 13520 13523 13529 13531 13534-13535 13537 13544-13545 13547-13550 13552 13554 13560 13571 13575 13584 13587-13588 13591-13592 13594-13597 13599-13601 13603-13606 13612-13614 13620 13622-13623 13625 13628 13630 13632 13639-13640 13642-13643 13650 13655 13657-13659 13664-13666 13671-13672 13674-13675 13678 13684-13685 13687 13694-13696 13698-13699 13705-13706 13708-13710 13717-13722 13724-13725 13727 13743 13747 13753-13755 13764 13766 13769-13771 13774-13775 13777 13785-13787 13809-13810 13812-13813 13815 13817 13821-13822 13824-13825 13830 13832-13833 13835 13841 13843-13845 13850-13851 13854-13855 13876-13878 13880-13882 13884 13886-13887 13900 13920-13921 13923-13924 13928 13930 13964-13965 13967-13968 13970-13971 13994-13995 13998 14000-14002 14013 14017-14020 14022-14023 14037-14038 14041-14042 14057-14059 14069 14071-14074 14076-14077 14085 14087-14088 14093 14095 14100-14101 14103 14108-14109 14111 14129 14131 14137 14148-14150 14157 14159 14167 14170 14176-14178 14185 14187 14200-14202 14204-14205 14208 14213 14215-14216 14218-14219 14245 14247 14265 14281-14284 14286 14288 14292 14294 14308 14325-14327 14366-14367 14377-14378 14382 14385 14387 14396-14397 14399 14402 14405-14409 14411 14413-14414 14419 14436-14438 14440-14441 14443-14444 14464-14466 14468-14470 14472 14475-14476 14491 14499 14501 14505-14506 14510 14512 14515-14518 14523-14524 14526-14528 14540-14541 14543 14550-14554 14562-14563 14565-14567 14569-14571 14592 14595-14597 14599-14600 14602 14611-14612 14614-14615 14630-14631 14634-14635 14641-14646 14648-14650 14658-14660 14662 14674 14677 14679 14688-14689 14691 14696-14697 14699 14719 14725-14727 14736 14738 14786-14787 14820-14822 14828 14830-14831 14851 14855 14861 14864 14869-14872 14875-14876 14879-14880 14886 14892-14894 14896 14901-14903 14906 14913-14917 14919 14952-14953 14955 14972 14974-14975 14978 14983 14986 14992 14994-14996 14999-15000 15004 15010 15013 15019 15025-15027 15034-15036 15040-15041 15047 15061 15063 15065 15068 15070-15071 15076 15079 15081 15093-15094 15097 15099 15101-15102 15112-15114 15140-15141 15143-15146 15148-15150 15156-15158 15160-15162 15172 15176-15178 15182 15200-15202 15246 15258 15260 15265-15266 15272-15273 15277 15279 15288 15291 15293 15298 15360-15361 15363-15366 15372 15374 15392-15393 15400 15402-15403 15406 15425 15427 15437 15439 15446 15448 15450-15451 15454 15460 15472 15474 15496-15498 15500 15624 15709-15710 15797 15838-15839 15860 17717 17725 17745 17749 17751 17756-17758 17767 17784 17787 17791 17842 17851-17852 17854 17857 17867 17873 17875 17879 17881 17898 17900-17902 17904 17907 18001 18006 18009 18015 18032-18033 18035 18041 18044-18045 18083 18107 18114 18119 18123-18124 18129 18136-18137 18151-18152 18161 18182-18183 18186 18188 18192-18193 18203 18206-18207 18210-18211 18213 18219 18228 18232 18242 18257 18264 18267-18270 18282 18288 18298 18308 18311 18315 18317 18319 18321 18323 18325 18330 18335 18342 18344-18345 18349 18352 18354 18356 18361 18370 18372 18374-18375 18381-18382 18388 18396-18398 18407 18410-18411 18413 18418-18419 18426 18668 18675 18686-18687 18788 18791 18793-18794 18800 18810-18811 18838 18852 18854 18858 18869 18871 18876 18882 18889 18891 18893 18903 18906-18907 18922 18929 18934-18935 18945 18952 18954 18958 18979 18987 18997 19008-19009 19026 19028 19030-19031 19036 19040 19043 19058-19059 19069 19078 19084 19094 19100 19102 19113 19117-19118 19126 19129 19132 19149 19164-19165 19170 19172 19175-19176 19179 19181 19184 19193 19195 19198 19207 19214 19217-19219 19221 19224 19228-19229 19239 19247-19248 19255-19256 19262 19288 19295 19297 19299 19305 19308-19309 19315 19328 19331 19340 19344 19346 19366 19370-19371 19374-19375 19378 19380 19385-19386 19388-19389 19391 19398 19408 19418 19421 19423 19434 19437 19441-19442 19445 19450 19457 19460 19463 19465-19466 19470 19474-19475 19479-19480 19482 19488-19489 19492 19494 19499 19505 19507-19509 19514 19525 19531 19535 19545 19553 19566 19574 19576 19584 19592 19598-19599 19605-19606 19616 19619 19628 19630 19635 19648 19658 19662 19665-19666 19676 19681 19702 19705 19708 19722 19750 19777 19779-19780 19787 19791-19793 19801 19803 19813 19827 19833 19836 19876 19880 19882 19886-19888 19899 19901 19905 19907 19916-19917 19922 19930-19931 19934 19942-19945 19947 19950 19956-19957 19959-19961 19963 19965-19967 19981-19982 19996 20001 20005 20008 20010 20018 20030 20063 20065 20068 20072-20073 20076 20079 20088 20090 20098 20102 20109 20116 20123 20125 20141-20143 20147-20150 20153-20154 20156-20158 20163 20168 20171 20174 20177 20185 20187 20197 20201 20207-20209 20217-20219 20222 20224-20225 20233 20237 20240 20246 20248 20251 20260 20271-20272 20274-20275 20278 20280-20281 20288-20289 20292 20294-20296 20300 20302 20304-20306 20309 20311 20317-20319 20322 20326 20328 20330 20338 20340 20342 20345-20348 20351 20355 20362 20367 20373 20375-20376 20378 20380 20382-20383 20386-20388 20392 20396 20398 20406 20412-20413 20418 20421 20423 20425-20429 20433 20435 20442-20445 20447 20452-20453 20461 20467-20468 20471 20475-20478 21375 21431 21433-21434 21441 21443 21460 21462 21472-21473 21475 21591 21597 21599 21619-21620 21622-21623 21625 21627-21630 21687 21711 21713 21717-21718 21722-21723 21725-21726 21730-21731 21765-21767 21776-21777 21779 21800-21802 21825-21826 21832 21835 21837 21840-21842 21845-21848 21850-21854 21872-21874 21880-21881 21883 21888 21890-21891 21897 21899-21900 21902 21905-21908 21910-21911 21913-21915 21932 21934-21935 21952-21953 21955 21969-21971 22013-22015 22034-22035 22044 22046-22047 22057-22059 22132-22133 22135 22141-22143 22148 22150 22157-22159 22161-22163 22168-22169 22171 22180 22182-22183 22212-22214 22225 22288-22290 22296 22298-22299 22325-22327 22345 22347-22350 22352 22354-22355 22361-22363 22370-22371 22373-22375 22381-22382 22500-22502 22512-22514 22524 22526-22527 22684 22687 22729-22731 22735 22740 22742 22746-22750 22755 22757-22758 22764-22765 22771-22774 22776-22777 22782-22783 22797 22806 22808-22810 22833 22836 22838 22849 22851 22853-22854 22857 22860-22862 22864-22865 22874-22875 22877-22879 22884 22886-22889 22892 22894-22895 22915 22918-22919 22927 22937 22942 22944 22947 22949 22956-22958 22963-22965 22967 22969-22974 22977 22979 22988-22989 22991 23010 23016-23017 23019-23020 23022 23025 23067 23087-23090 23093-23096 23098-23100 23106-23110 23112-23113 23115 23122 23124 23126 23129 23133 23136-23137 23143 23146 23149 23152-23153 23156-23158 23165 23173 23175 23181-23182 23188-23189 23193-23197 23199 23201-23202 23206 23211 23217 23220-23221 23224 23230-23231 23237-23238 23244-23246 23250 23252-23253 23256 23261 23263 23266-23270 23272-23273 23278 23280 23282 23284-23285 23288 23292-23294 23296 23299 23302 23305 23311 23313 23315 23317-23320 23322-23324 23329 23331 23335-23338 23345-23346 23348-23350 23352 23360 23363-23364 23366 23373 23377-23379 23384-23385 23387 23389-23391 23396 23400-23402 23404-23406 23408-23410 23416-23417 23419 23428-23429 23434-23435 23438-23439 23443-23446 23450 23452 23454-23455 23464 23466 23468-23469 23473 23476-23478 23486-23487 23490 23493 23495 23497 23506 23509-23512 23515-23518 23523 23532-23533 23535 23560-23562 23592-23593 23595-23598 23721-23723 24065 24067-24069 24071 24073-24074 24076-24078 24105-24106 24194-24195 24197-24199 24213-24215 24232-24233 24235 24272 24274 24277-24279 24282 24300-24302 24304 24306 24309 24311-24312 24314 24317 24319 24540-24542 25438-25439 25459 25468 25470-25471 25557 25559 25575 25592 25773 25788 25797 25814 25819 25832 25849 25853 25895 25906 25916 25925 25937-25938 25941-25942 25951 25962 25969 25976 25986-25987 25997 26000 26014 26017 26021 26036 26041 26054-26055 26065 26073 26081 26086 26092-26094 26107 26133 26140-26141 26148 26177 26182 26187 26191 26193 26246 26249-26250 26253 26272 26281-26283 26295 26302 26314 26327 26391 26397 26402 26411-26412 26418 26421 26440 26443 26450 26457-26458 26474 26478 26488 26491 26500 26509 26511 26518 26524 26526 26553 26569 26573 26577-26578 26584 26590 26604 26745-26746 26830 26835 26839 26844 26855 26863 26866 26900 26902-26903 26909 26915 26937 26944-26946 26952 26958-26959 26967 26970-26971 26975 26980 26982 26994 27005 27007 27017 27025 27032 27034 27040 27043 27052-27054 27057 27065 27088-27089 27092-27094 27096 27098-27099 27102-27103 27112 27144-27145 27148 27156 27173 27175 27180 27183 27185 27187 27195-27196 27198-27199 27204-27205 27212 27231-27232 27234 27236-27237 27242 27247 27252 27263 27265 27267-27268 27272-27273 27275-27276 27278-27279 27282 27285-27288 27290-27291 27293 27295-27296 27299 27304 27307-27310 27317-27318 27321-27322 27326-27328 27331 27335-27336 27338 27343-27344 27347 27351 27354 27361-27363 27365 27368 27370 27376 27380 27382 27386 27397 27402 27415-27416 27430 27436 27438 27441 27443 27450 27453 27460 27462 27471 27479 27483 27488-27489 27493 27501 27512 27514-27515 27520 27527 27533 27537 27562 27565 27571-27573 27586-27587 27600 27602-27603 27608 27624 27637 27639 27645 27647 27651-27653 27657 27662 27668 27680 27688 27693 27696 27706 27710-27711 27723 27727-27728 27741 27747-27748 27753 27757 27761 27770 27775 27779 27783 27786 27791 27810-27813 27816 27820-27821 27826 27830 27832-27833 27845 27858 27905-27907 27910 27933 27950 27957 27973 27981 27983 27986-27988 27990 27997 28001 28004 28006-28007 28035 28047 28055-28057 28072 28080 28087 28100 28102 28125 28131 28142 28149 28177 28181 28190 28199 28222 28235 28259 28271 28282 28285 28294 28301 28304 28317 28320 28326 28334 28342 28346 28348-28349 28357 28359 28365 28370-28371 28383 28386-28387 28394 28399 28412 28414 28435 28458 28460 28469 28477 28479-28481 28484 28486 28499 28502-28503 28505 28517-28518 28521 28568 28572 28577 28579-28580 28589-28590 28593-28594 28600-28601 28608-28609 28623 28626 28651 28656 28659 28665 29653-29654 29663 29680 29683 29695 29933 29935 29938-29939 29942-29945 29947 30122 30173 30175 30196-30198 30201 30277 30288 30291-30294 30354 30362 30368 30371 30373 30375 30386-30387 30392 30394-30397 30399 30430 30436 30438-30439 30444-30445 30447 30452 30456 30460 30585 30589 30591 30673 30677-30679 30685 30844 30908 30929 30933 30959 31001 31027-31028 31030 31055-31057 31060 31062 31065 31067-31068 31070-31071 31077-31079 31087 31091-31092 31094-31097 31100 31104 31113 31119 31134 31147 31150 31167 31170 31173 31176 31183 31185 31200-31201 31207 31249 31254-31255 31289 31297 31299 31302 31309 31316 31321 31325 31328-31329 31336 31357-31358 31372 31382 31388 31390 31393-31394 31404-31405 31409 31414 31423 31426 31435 31445 31451 31453 31456 31459-31461 31466 31471 31479 31486-31487 31489 31499-31500 31502-31504 31510 31519 31530 31536 31539 31547 31562 31566 31575-31577 31579-31582 31599 31604 31617 31624-31625 31629 31641 31676-31677 31679-31680 31682-31684 31686 31688 31690 31697 31700 31703-31704 31715 31721-31723 31732-31733 31742 31756 31760-31761 31763 31771 31773-31774 31776-31777 31779 31787 31798 31805 31816 31819 31821-31823 31826 31830-31832 31834 31836 31841-31845 31848 31856 31859-31861 31863 31865 31867 31869-31872 31877-31878 31883-31884 31887 31892-31893 31895 31899 31901 31903-31906 31909-31913 31917 31920 31924 31927 31930 31934 31938 31942-31943 31950 31953-31954 31956-31957 31960 31962 31969-31970 31973 31978 31982-31983 31986 31988-31989 31993 31995-31997 31999-32000 32003 32032 32034-32035 32040-32041 32043 32046 32076 32125-32126 32132 32134-32135 32140-32141 32143 32147 32152 32154 32156 32160-32162 32164-32165 32168 32170-32171 32175 32177 32184 32188 32190 32212 32214-32215 32232 32234-32235 32244-32245 32247 32251 32253 32255 32259 32262-32263 32267 32276 32280 32282 32288-32289 32292 32294 32298 32300-32301 32314 32321 32324 32329 32336-32337 32344 32346 32349 32352 32358 32374 32388 32401 32407 32409 32415 32418 32433-32434 32437 32440 32450 32457 32492 32496 32507 32512 32515 32517 32520 32522-32526 32529-32532 32534 32537-32538 32541 32545-32546 32552-32553 32555-32556 32563 32570 32573 32577 32579 32584 32588-32590 32592 32594 32596 32604 32609-32610 32615-32617 32623-32624 32627 32629 32642 32647-32648 32652 32657 32661 32667 32670 32680 32695 32711 32718-32719 32728 32730 32733 32738-32739 32750 32752 32755 32757 32761-32762 32764 36715 36731 36807-36808 36815 36818 36824 36830 36850 36853 36857-36858 36861-36863 40887 40890-40893 40910-40911 40914 40919 40921 40925 40929 40931 40933-40934 40936 40940 40943 40945 40948 40950-40954 40956 40958-40959 45036 45038 45045 45051 45053 48988 49006-49007 49095 49104-49105 49108https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/169/270?format=asciiOpticalInfrareddefaultJ/AJ/169/270/table2The Catalogs of CP1 and CP2 Stars in the LAMOST DR11 (v1.0) and DR12 (v0) (revised from Erratum)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspLAMOST DR11 v1.0 spectrum (link to http://www.lamost.org/dr11/v1.0/)meta.ref.urlcharObsID[405074/1247205195] Unique Spectra ID from LAMOSTmeta.id;meta.mainlongRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedSpTypeLLAMOST derived spectral type (1)src.spTypecharTeff[4786/13307] LAMOST effective temperatureKphys.temperature.effectivedoublee_Teff[3.6/777]? Teff uncertaintyKstat.error;phys.temperature.effectivefloatnullablelogg[2.1/4.9] LAMOST log surface gravitylog(cm.s**-2)phys.gravityfloate_logg[4e-3/1.11]? logg uncertaintylog(cm.s**-2)stat.error;phys.gravityfloatnullable[Fe/H][-2.5/0.995] LAMOST metallicityphys.abund.Zfloate_[Fe/H][2e-3/0.662]? [Fe/H] Uncertaintystat.error;phys.abund.FefloatnullableSpTypeMMKCLASS code derived spectral typesrc.spTypecharqflagQuality flag for SpT_mkclass if any (from "poor" to "vgood") (2)meta.code.qualcharsubClassSubclass of CP type stars (3)src.classcharfNew[0/1] "0"=Known stars; "1"=New stars (4)meta.codeintGaiaDR3? Gaia DR3 (I/355) source identifier as obtained from LAMOSTmeta.idnullableVersionLAMOST data release version, DR11 v1 (V/162) or DR12 v0 (5)meta.softwarechar