Am and Ap star candidates from LAMOST DR10 J/ApJS/272/43 ivo://CDS.VizieR/J/ApJS/272/43 doi:10.26093/cds/vizier.22720043 CDS Yang H.-F. Wang R. Cai J.-H. Luo A.-L. Du B. He Y.-T. Su M.-H.,Shi C.-H. Zhao X.-J. Xun Y.-L. Yuan Y.-N. 2025-02-13T20:14:07Z 2024-11-18T08:44:01Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr peculiar-variable-stars am-stars stellar-spectral-types metallicity apparent-magnitude visible-astronomy spectroscopy surveys Large samples of Am and Ap stars are helpful in studying the interplay between phenomena like atomic diffusion, magnetic fields, and stellar rotation in stellar astrophysics. Existing samples of Am and Ap stars, mostly obtained from spectral data with a signal-to-noise ratio in the g band (S/Ng) greater than 50, can benefit from expansion by exploring spectra with lower S/Ng. Therefore, this paper proposes an ensemble regression model applicable to spectra with a minimum S/Ng of 30. Using the model, we identify 21361 Am candidates, of which 11614 are new, and 6182 Ap candidates, of which 4978 are new, from LAMOST DR10. The Am sample size has increased by 60% and the Ap sample size has increased by 180% compared to the previous sample. In terms of effective temperature (Teff), the Am candidates range mainly from 6000 to 8500K, while the Ap candidates range from 6000 to 11700K. The surface gravity (logg) distributions for Am and Ap candidates differ in the range of 3.25-4.75dex. The number of Am candidates increases stepwise, in contrast to the relatively uniform distribution of Ap candidates across the entire surface gravity range. Regarding metallicity ([Fe/H]), Am candidates typically range from -0.75 to 0.38dex, peaking near 0dex, while Ap candidates are distributed from -1.38 to 0.38dex, with a peak near -0.5dex. 2024ApJS..272...43Y https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/272/43 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/260 : General Catalogue of Ap and Am stars (Renson+ 2009) V/156 : LAMOST DR7 catalogs (Luo+, 2019) IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021) I/354 : StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/A+A/475/1053 : Magnetic fields in Ap/Bp stars (Auriere+, 2007) 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/MNRAS/487/4695 : Rotationally variable A stars from TESS (Sikora+, 2019) J/MNRAS/496/832 : The SDSS/APOGEE catalogue of HgMn stars (Chojnowski+, 2020) J/A+A/640/A40 : 1002 mCP stars from LAMOST DR4 (Hummerich+, 2020) J/A+A/645/A34 : LAMOST DR4 New mercury-manganese stars (Paunzen+, 2021) J/ApJS/259/63 : Chemically peculiar stars from LAMOST (Shang+, 2022) J/ApJS/266/14 : Am stars selected in LAMOST DR8-DR10 (Tian+, 2023) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/272/43 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/272/43 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/272/43 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/272/43 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/272/43 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/272/43 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/272/43/table8 (The catalogs of Am and Ap candidates in the LAMOST Dr10 (v1.0)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/272/43/table8? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/272/43/table8? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/272/43/table8? 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14069 14071-14072 14074-14077 14085 14087-14088 14093 14095 14101-14104 14106 14128-14129 14131 14137 14139 14148 14150 14157 14159 14165 14167 14170-14171 14176 14178 14184-14185 14187 14200-14202 14204-14205 14218 14221-14223 14242 14245 14247-14249 14252 14257-14259 14265 14284 14286 14288 14290 14308 14366-14367 14377-14380 14382-14383 14387 14396-14397 14399 14402 14405-14406 14414 14419-14420 14422-14423 14425 14428-14429 14431 14436-14438 14444 14468-14470 14472-14473 14475-14476 14491 14498-14499 14501 14504-14505 14510-14512 14517-14518 14521 14523-14524 14528 14541 14543 14552-14554 14557-14559 14561 14565 14567 14573 14575 14577-14579 14592 14594-14595 14600 14602 14630-14631 14635-14637 14639 14641-14643 14648 14650 14652 14660 14662 14674 14677 14679 14685-14687 14697 14699 14716 14719 14721-14723 14736 14738 14786-14787 14805-14807 14820-14822 14828 14830-14831 14851 14855 14861 14863-14864 14869 14871 14875-14876 14879-14880 14883-14884 14886-14887 14892-14894 14896 14901 14903-14904 14906 14911 14914 14916-14917 14919 14921 14923 14925 14936 14938-14939 14944-14945 14947 14949-14951 14953 14955 14957-14959 14964-14965 14972 14974-14975 14978 14983 14994 14996 14999-15000 15004 15006 15010 15012-15014 15020-15022 15025-15027 15029 15034-15035 15037 15040-15041 15044 15047 15060-15062 15071 15076 15088 15090 15097-15099 15101 15133-15134 15140-15141 15143-15146 15156-15158 15160-15161 15172 15176-15178 15200-15202 15263 15273 15279 15281 15288 15291 15298 15320 15360-15361 15363-15364 15366-15367 15372 15392-15393 15400 15402-15403 15406 15425 15427 15435 15438-15439 15446 15454 15461 15472 15492-15493 15496-15497 15499-15500 15624 15797 17661 17717 17724 17738 17757 17762 17764 17767 17772 17774 17784 17786-17787 17791 17842 17851-17852 17859-17860 17867 17873 17875 17878-17879 17881 17903 17908-17909 17916 18001 18006 18015 18027 18039 18042 18085-18086 18107 18118 18127 18136-18137 18151-18152 18183 18186 18188 18193 18197 18207 18211 18219 18224 18226 18232 18235-18236 18264 18270 18290 18311 18317 18323 18325 18330 18335-18336 18343-18344 18354 18356 18361 18370 18396 18407 18411 18413 18418 18426 18668 18671 18674 18678 18686-18687 18788 18791 18809 18811 18841 18852 18854 18862 18865 18869 18876 18881-18882 18886 18889 18891 18893 18900 18906 18910-18912 18921-18922 18932-18933 18952 18954 18958 18979 18981 18983 18987 18989 18991 18997 19011 19018 19026 19028 19030 19034 19036-19037 19040 19043 19051 19058 19069 19078 19081-19082 19084 19102 19113 19117-19118 19125 19129 19145 19155 19160 19162-19165 19170 19172 19179 19193 19195 19197-19198 19214-19215 19218-19219 19221 19223 19226-19227 19234 19242 19248 19255 19257 19259 19262 19288 19297 19302 19305 19307 19309 19311 19315 19317 19323 19328 19331 19340 19347 19360 19371 19373 19375 19383 19385-19386 19388-19389 19391 19398 19408 19413 19431 19434-19435 19437-19438 19440 19442 19444-19445 19450 19457 19462-19463 19466-19468 19470 19479 19483 19488-19489 19499 19505 19508-19509 19511 19513 19525 19535 19566 19576 19579-19580 19582 19592 19612 19616 19619 19621 19623 19626 19628 19666 19681 19697 19702-19703 19705 19708-19709 19760 19777-19779 19782 19786 19792-19793 19800 19855 19875 19881-19882 19887-19888 19901 19905 19907-19908 19910-19911 19913 19917 19922 19929-19931 19935 19942-19945 19950 19954 19957 19965-19967 19970 19974 19981 19996 20003 20005 20008 20010-20011 20019 20021 20030-20031 20053 20065 20072-20073 20076 20079 20088 20102 20107 20109 20111 20117 20128-20129 20133 20141-20142 20154-20156 20158 20162-20164 20167-20168 20171 20174 20178 20184-20185 20190-20191 20197 20206 20218 20222 20224-20225 20230 20237 20239-20240 20250 20254 20260 20271 20274 20278 20283-20284 20286 20288-20289 20292 20294-20296 20300 20302 20304-20305 20311 20316-20318 20320-20321 20338-20339 20341 20345 20355 20362-20363 20367 20373 20375 20380-20382 20385-20388 20392 20396 20398-20400 20412 20419 20421 20429 20431 20433 20435 20441-20443 20445-20446 20448 20450 20453 20459-20461 20468 20472 20475 20477 21357-21358 21368 21370-21371 21375 21423 21433-21434 21438-21439 21441 21443 21460 21462 21473 21475 21478-21482 21484-21485 21487-21489 21491 21591 21597 21599 21619 21621-21623 21625 21627-21630 21687 21710-21711 21717-21719 21722-21723 21725-21727 21731 21733-21735 21748 21750-21751 21761-21763 21766-21768 21770-21771 21785-21788 21790-21791 21797-21799 21805-21807 21817-21822 21825-21826 21832 21835 21841-21843 21845-21847 21852-21853 21857 21859-21862 21865-21867 21869-21871 21874 21876-21877 21879-21881 21883 21887-21888 21890-21893 21895 21897 21899-21900 21902 21905-21908 21910-21911 21914-21918 21948 21950-21951 21954-21956 21959 21969-21970 21972 21974-21975 21977-21979 21993-21995 22000-22001 22003 22023 22030-22031 22034-22035 22040-22042 22044 22057-22058 22108-22109 22111 22128 22130-22133 22135 22151-22152 22154-22155 22157-22159 22161-22163 22180 22182-22183 22212 22214 22225 22288-22290 22296 22298-22299 22345 22347-22348 22350 22352 22354 22357-22358 22360 22362 22365-22368 22370-22371 22380-22382 22396 22398-22399 22484-22485 22487 22500-22502 22512-22513 22515-22518 22687 22729-22731 22735 22740 22743 22746-22748 22750 22755 22757-22759 22764 22771 22773 22776-22777 22781 22783 22788 22791 22796-22797 22805 22808-22810 22813-22815 22833 22836 22839 22844 22848-22850 22852-22854 22857 22859-22860 22862-22864 22867 22875-22876 22878-22879 22888-22889 22892 22894-22895 22899 22901-22904 22906 22913 22915 22917-22918 22923 22927 22937 22942 22945-22949 22952 22955-22956 22962-22965 22969-22970 22979 22981-22983 22988-22989 22991-22992 22994-22995 23016 23018-23020 23022 23025 23037 23087 23090 23095 23098 23115 23122 23124 23126 23129-23130 23133 23141-23142 23144 23146 23151-23152 23158 23160 23163 23165 23167 23182 23184 23186 23190 23201-23202 23206 23210 23215 23222 23230-23231 23234 23242 23244 23252-23253 23260-23261 23268 23272 23275 23277 23282 23284 23286 23288-23289 23293-23294 23296 23302 23305 23311 23313 23315 23317 23320 23322 23325-23326 23329 23331 23335 23337-23339 23343 23348 23350 23364 23366 23369-23371 23379 23383-23385 23387 23389-23390 23395-23396 23399-23402 23404-23405 23408 23410 23412-23413 23415-23417 23419 23427-23429 23435 23438-23439 23443-23444 23446 23455 23458 23464 23466 23469 23474-23476 23479 23486 23488 23492-23493 23495-23497 23506 23511-23513 23515-23517 23523 23526 23528-23530 23541-23543 23545-23550 23561-23563 23592-23593 23595-23596 23621 23638-23639 23692 23694-23695 23712-23713 23715 23721-23723 23736-23738 23740-23741 23743 23892 23894-23895 24065 24067 24069 24071 24074 24076-24077 24100 24102-24106 24204-24205 24207 24213-24215 24229-24233 24235 24273-24274 24277 24286-24287 24300-24301 24304 24306 24310-24311 24314 24317-24319 24404-24405 24407-24410 24432 24434-24435 24437-24439 24448-24449 24451 24457-24458 24540-24542 25423 25468 25471 25557 25559 25773 25788 25814 25819 25832 25846 25895 25903 25916 25921 25925 25938 25941-25942 25949 25962 25968 25976 25984 25986-25987 25994 26000 26011 26014 26017 26027 26053-26054 26081 26086 26092 26164 26187 26212 26227 26229 26232 26246 26252-26254 26260 26266 26272 26282-26283 26295 26302 26314 26325 26337 26380 26402 26406 26412 26417-26418 26421-26422 26438 26448 26458 26469 26472 26483 26488 26511 26516 26525 26540 26554 26572 26576 26585 26587 26590 26598 26610 26620 26622 26839 26844 26855 26866 26868 26900 26905 26907 26909 26911 26915 26939 26948 26954 26956 26960 26975 26985 27005 27010 27017 27032 27040-27041 27043 27051 27053-27054 27057-27058 27065 27082 27088-27089 27093 27102-27103 27112 27120 27125 27134 27144-27145 27147-27148 27162 27173 27175 27183 27187 27198 27205 27210 27231-27232 27234 27242 27247 27252 27256 27266-27268 27272-27273 27275-27277 27280 27282-27283 27290-27291 27295 27299-27301 27303 27308-27310 27312 27314-27315 27317-27318 27321-27323 27326 27328 27335 27337 27341 27344 27347 27350 27354 27370 27380 27397 27414-27415 27417 27429-27430 27432 27438-27439 27450 27453 27462 27479 27487-27488 27494 27498 27501 27514 27518 27525 27527 27544 27546 27548 27570 27572-27573 27575 27586 27591 27608 27624 27632 27637 27639 27645 27647 27651 27653 27660 27662 27668-27669 27686 27688 27693 27696 27711 27723 27751 27753 27761 27764 27770 27789 27794 27802 27810 27812 27817 27820-27821 27845 27852 27882 27905-27906 27933 27937-27938 27950 27954 27966-27968 27973 27980 27991 27998 28001 28006-28007 28035 28055 28057 28080 28095 28097 28100 28102 28136 28139 28142 28168 28170 28188 28192 28199 28235 28256 28283 28301 28304 28320 28326 28330 28332 28349 28352 28357 28365 28370-28371 28374 28387 28394 28409 28429 28481 28484-28485 28490 28499 28517 28537-28538 28577 28582 28589-28590 28594 28600 28609 28617 28651 28665 29567 29654 29661 29680 29683-29684 29686 29692-29693 29695 29927 29933 29935 29938 29942-29945 30173 30196 30198 30201 30204-30206 30277 30291-30293 30346 30354 30362 30368 30375-30378 30387 30390-30392 30394-30395 30430 30433-30435 30438-30439 30452 30456-30457 30460 30582-30583 30586 30589 30591 30679 30685 30904 30929 30932 30935 30940 30959 31001 31006 31018 31027-31028 31030-31031 31055-31057 31059 31061-31063 31065 31067 31077-31078 31091-31092 31095-31097 31104-31105 31107 31113 31121 31134 31140-31141 31147 31149-31150 31167 31169-31170 31176 31178 31180 31183 31201 31205-31207 31231 31249 31251-31252 31255 31289 31299 31305-31306 31310 31321 31325 31340 31357 31372 31382 31384 31388 31391 31393 31395 31405 31409 31426-31427 31436 31442 31451 31459 31463 31471 31489 31492 31494 31500 31504 31519 31539 31546-31547 31562 31566 31575-31576 31578-31582 31607 31617-31618 31623-31625 31629 31631 31641 31673 31688 31690 31697 31703 31714 31720-31721 31732-31733 31756-31757 31770-31771 31773 31775-31777 31787 31798-31799 31802 31805 31816-31817 31819 31821-31823 31830-31832 31834 31836 31841-31843 31845 31848 31856-31857 31860-31861 31863 31865 31867-31868 31870-31872 31875 31877-31878 31883-31884 31886 31892-31893 31898-31901 31903 31909-31912 31917 31924 31927 31930 31934 31936 31938 31948 31950-31951 31953-31954 31956-31957 31960-31962 31964-31965 31973 31978 31986 31988-31989 31995-31996 32010-32011 32032 32034-32035 32046 32076 32125-32127 32132 32134 32136 32140 32142 32146-32147 32150 32152-32154 32158 32161-32162 32165 32168 32170-32171 32182-32185 32187 32189-32190 32223 32232 32234-32235 32244-32245 32247 32251 32253-32255 32259 32261 32265 32267 32276 32280 32282 32292-32293 32299 32301 32314 32325 32336 32338 32346 32349 32352-32353 32358 32360 32383 32388 32390 32393 32400-32401 32407 32409 32415 32433-32434 32437 32440 32458 32460 32463 32465 32477 32497 32500 32507 32510 32512 32515 32517 32520 32523-32526 32528 32530-32532 32535 32537 32540-32541 32548 32550-32551 32553-32558 32562-32564 32570 32577 32579 32588-32590 32592 32594 32596 32601-32602 32605 32609 32611 32613-32617 32621 32623-32624 32626-32627 32629 32647-32648 32657 32659 32667 32670 32680 32685-32686 32695 32700 32704 32711 32718 32728 32730 32750 32757 36715 36807 36816 36824 36830 36847 36852 36856-36858 36861-36863 40886-40887 40890-40891 40910 40914 40919 40921 40924 40926 40929 40931 40936 40938 40943 40945 40948 40950-40951 40956 40958-40959 45036 45038 45041 45045 45047 49007 49095 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/272/43?format=ascii Optical default J/ApJS/272/43/table8 The catalogs of Am and Ap candidates in the LAMOST Dr10 (v1.0) SNRg [30/999] Signal-to-Noise of LAMOST spectrum in g band stat.snr;em.opt.B float SpT-LA LAMOST spectral type src.spType char logg [3.25/4.75] LAMOST log surface gravity log(cm.s**-2) phys.gravity float e_logg [0.08/0.41] Uncertainty in log (g) log(cm.s**-2) stat.error;phys.gravity float Teff [6000/20000] LAMOST effective temperature K phys.temperature.effective float e_Teff [126/1495] Uncertainty in Teff K stat.error;phys.temperature.effective float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Seq [1/27543] Internal index number meta.id int [Fe/H] [-1.4/0.4] LAMOST log Fe/H number abundance log(Sun) phys.abund.Fe float e_[Fe/H] [0.05/0.3] Flag on [Fe/H] log(Sun) stat.error;phys.abund.Fe float Gmag [5.24/20.85]? Gaia DR3 G band magnitude mag phot.mag;em.opt float nullable e_Gmag [0.0027/0.07]? Uncertainty in Gmag mag stat.error;phot.mag;em.opt float nullable SpT-MK MKCLASS code spectral type src.spType char q_SpT-MK Quality flag for SpT-MK if any (from "poor" to "excel") meta.code.qual;src.spType char RFactor [0.9/0.993] Reliability factor; see Section 2.3 meta.code.qual double Type Star type ("Am"=21361 occurrences or "Ap"=6182 occurrences) src.class char n_Type [*] *=new star type (1) meta.note;src.class char S22 Display previous data from Shang+ 2022, J/ApJS/259/63 meta.ref.url int nullable GaiaDR3 ? Gaia DR3 identifier meta.id.cross nullable Teff-G [3290/18757]? Gaia DR3 effective temperature K phys.temperature.effective float nullable b_Teff-G [3288/18433]? Lower boundary in Teff-G K stat.error;phys.temperature.effective;stat.min float nullable B_Teff-G [3291/18912]? Upper boundary in Teff-G K stat.error;phys.temperature.effective;stat.max float nullable logg-G [1.59/5.07]? Gaia DR3 log surface gravity log(cm.s**-2) phys.gravity float nullable b_logg-G [1.58/5.06]? Lower boundary in log(g)-G log(cm.s**-2) stat.error;phys.gravity;stat.min float nullable B_logg-G [1.6/5.08]? Upper boundary in log(g)-G log(cm.s**-2) stat.error;phys.gravity;stat.max float nullable [Fe/H]-G [-4.15/0.8]? Gaia DR3 log Fe/H number abundance log(Sun) phys.abund.Fe float nullable b_[Fe/H]-G [-4.15/0.8]? Lower boundary in [Fe/H]-G log(Sun) stat.error;phys.abund.Fe;stat.min float nullable B_[Fe/H]-G [-4.15/0.8]? Upper boundary in [Fe/H]-G log(Sun) stat.error;phys.abund.Fe;stat.max float nullable Teff-L [4079/19326]? LASP effective temperature K phys.temperature.effective float nullable e_Teff-L [6/630]? Uncertainty in Teff-L K stat.error;phys.temperature.effective float nullable logg-L [-0.2/4.9]? LASP log surface gravity log(cm.s**-2) phys.gravity float nullable e_logg-L [0.007/0.8]? Uncertainty in log(g)-L log(cm.s**-2) stat.error;phys.gravity float nullable [Fe/H]-L [-2.5/1]? LASP log Fe/H number abundance log(Sun) phys.abund.Fe float nullable e_[Fe/H]-L [0.003/0.9]? Uncertainty in [Fe/H]-L log(Sun) stat.error;phys.abund.Fe float nullable DR7 Display data from LAMOST LRS DR7 (V/156) within 1.5" meta.ref.url int nullable ObsID [703238/1017907053] LAMOST unique identifier of the spectrum meta.id;meta.main long RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main indexed