J/ApJS/280/24ivo://CDS.VizieR/J/ApJS/280/24CDSTan L.Mei Y.Qian J.Wang X.Cui Y.Huang A.Wang F.Deng H.,Liu C.Chi H.2026-06-24T06:57:32Z2026-06-24T07:50:43ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyyoung-stellar-objectsemission-line-starsThe H{alpha} emission line commonly appears in the spectra of many stars and serves as a key indicator for tracing ionized interstellar gas, investigating stellar activity, and studying gas dynamics. Young stellar objects (YSOs), representing the early evolutionary stages of stars, typically exhibit the H{alpha} emission line in their spectra. In this paper, we use bidirectional long short-term memory networks and convolutional neural networks to identify H{alpha} emission-line stars in medium-resolution spectra from the Large Area Multi-Target Fiber Optic Spectroscopic Telescope (LAMOST) survey, and further search for YSO candidates via the Li absorption line. We constructed a data set by crossmatching previously published data sets with LAMOST data and performing manual verification. Using this data set, we built an identification model that achieved an accuracy of 97.58% on the testing set. Application of this model to the full survey yielded 46,867 H{alpha} emission-line star candidates, with 41,996 visually confirmed detections (15,329 of which are recorded in SIMBAD). To further identify YSOs, we developed a dedicated Li absorption line detector, identifying 4618 preliminary candidates from the H{alpha} emission-line stars. Rigorous vetting confirmed 4255 YSO candidates, comprising 3470 previously cataloged objects and 785 new discoveries. All catalogs (H{alpha} emission-line stars and YSOs) and the code of the proposed model are publicly released to facilitate community research.2025ApJS..280...24Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/280/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/360 : Gaia DR2 x AllWISE catalogue (Marton+, 2019)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)VII/293 : Classifier catalogue of class II YSO posteriors (Wilson+, 2023)V/162 : LAMOST DR11 catalogs (Luo+, 2026)J/A+A/333/619 : Upper Scorpius OB assoc. Lithium survey (Preibisch+ 1998)J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSOs (Megeath+, 2012)J/ApJ/794/124 : Young forming region NGC2264 Spitzer sources (Rapson+, 2014)J/ApJ/827/96 : WISE census of YSOs in Canis Major (Fischer+, 2016)J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016)J/MNRAS/493/4463 : Crystalline silicate absorption at 11.1{mu}m (Do-Duy+, 2020)J/A+A/643/A122 : Active deep learning in large sp. surveys (Skoda+, 2020)J/A+A/638/A21 : New Herbig Ae/Be & classical Be stars cat. (Vioque+, 2020)J/A+A/647/A116 : YSO candidate catalog from ANN (Cornu+, 2021)J/MNRAS/500/4849 : GALAH emission-line stars (Cotar+, 2021)J/ApJS/254/33 : Gal. midplane Spitzer/IRAC cand. YSOs (SPICY) (Kuhn+, 2021)J/AJ/162/282 : Untangling Galaxy. III. PMS stars (Mcbride+, 2021)J/A+A/663/A133 : YSOs toward IRAS 22147+5948 in outer Galaxy (Karska+, 2022)J/A+A/664/A175 : MW low mass young stars from Gaia EDR3 (Prisinzano+, 2022)J/ApJS/260/35 : Classical Be stars from LAMOST MRS DR7 (Wang+, 2022)J/ApJS/259/38 : Ha emission-line stars & Herbig Ae/Be (Zhang+, 2022)J/A+A/674/A21 : KYSO - The Konkoly Optical YSO catalogue (Marton+, 2023)J/ApJS/267/7 : YSO candidates from LAMOST LRS DR9 & ZTF (Zhang+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/280/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/280/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/280/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/280/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/280/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/280/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/280/24/table3 (Basic information of the 41,996 H{alpha} emission line stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/280/24/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/280/24/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/280/24/table3?GETtext/xml+votable180.050000true15.06106215.8651660.005555555555555556Cone search capability for table J/ApJS/280/24/table4 (Basic information of the 4,255 YSO candidates and the 78 sources potentially contaminated by LPV)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/280/24/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/280/24/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/280/24/table4?GETtext/xml+votable180.050000true344.0480758.6671610.0055555555555555564/81 91 120 122 203 206 1390 1428-1429 1470 1485 1500 5/85-86 92 113 115-118 211 214-216 220 256 259 261-263 268-269 281 286 289 292 321 323 333 335 339 344 355-356 358-359 361 363 384-386 389 391 433 439-440 443 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14277 14283 14285-14287 14293-14297 14299 14305-14309 14311 14316-14317 14328 14332-14333 14335 14356-14357 14402 14573 14586 14607 14617-14620 14622-14623 14636-14637 14639 14652-14653 14657 14659 14665-14667 14669-14671 14679-14680 14682-14683 14685 14700-14702 14704 14706 14762-14764 14767 14770 14778-14780 14782 14888 14907 14921 14924 14929 14931-14934 14936-14938 14948 14955-14957 14959 14964 14969 14978 14981-14982 14984-14985 14992 15000 15008 15011 15013-15014 15016 15037 15078 15082 15084-15086 15096 15106-15110 15112-15114 15116 15118-15120 15123 15125-15127 15130 15132 15135 15137 15139 15143 15176 15227 15255 15262 15274 15278 15289 15294-15295 15307 15368-15369 15372-15373 15376 15378-15380 15385 15398 15404 15406-15407 15409-15412 15414 15416-15418 15440-15442 15455 15477 15479 15485 15617 15619 15624-15626 15640 15642 15652-15653 15655-15657 15660 15664 15684 15723 15726-15727 15773 15797 15809 15811 15814 15816 15818-15820 15822 15840 15862 15866 15870 15913 16007 16012 16196-16198 16203 16206 16208 16210 16219-16220 16228 16372 16382 17357 17359 17362 17374 17381 17393-17395 17397 17406 17771 17857 17859-17860 17862-17863 17867-17870 17917 18012 18034-18035 18041-18044 18080 18095 18104 18107 18128 18134 18137 18139-18141 18143 18161 18164-18166 18180 18183 18187 18203 18219 18304 18313-18315 18319 18328 18330 18333-18338 18340-18341 18344-18345 18347 18350 18353-18355 18358-18361 18363 18365 18367 18398 18410 18416-18417 18423-18424 18429 18766 18800 18837-18838 18845-18846 18849 18860 18880 18889 18892 18912 18935 18941 19053 19057 19060 19062-19063 19065 19068 19070-19071 19112 19115 19143 19154 19156-19157 19159 19163 19187-19189 19247 19325 19328-19329 19333-19335 19340 19413 19436 19448-19449 19456 19459-19460 19467-19470 19472-19473 19482 19485-19486 19490 19492-19493 19496-19497 19503-19504 19506-19509 19513 19517 19553-19554 19558 19560 19595 19598 19603 19610 19612 19614 19619-19622 19634 19648 19651 19653 19661 19663 19670 19691-19692 19700 19728 19732 19741 19743 19778 19782 19787 19790 19800 19802 19834 19850 19892 19897 19900 19936 19939 19945 20002-20003 20009 20011 20045 20089 20096 20140 20142 20154 20158-20159 20184 20198 20206 20211 20214-20216 20219-20220 20245 20247 20290 20294 20298 20332-20333 20342 20346 20349 20373-20374 20378-20379 20387 20392 20409 20411 20419-20420 20423 20425 20427 20429 20440 20442 20444-20445 20453-20454 20465-20466 20468 20470 20472-20473 20476-20477 21351 21370-21371 21373-21375 21389 21391 21394-21395 21398-21399 21413 21432 21435-21436 21438-21439 21445-21447 21453-21455 21462 21464-21466 21468-21469 21484-21485 21487-21488 21490-21491 21495 21647 21669-21670 21673 21675 21688-21689 21691-21692 21695 21762-21763 21773 21775 21801 21805 21808 21814 21817 21830 21837 21846 21849 21858 21864 21868-21869 21876 21882 21884 21893 21910-21911 21919 21941 21952-21953 21955 21958 21961 21967-21968 21970 21972 21985 21989-21990 21998 22005 22015 22028-22029 22032 22035 22038-22039 22041-22042 22048-22050 22052-22054 22057-22061 22064 22074 22076-22078 22080 22082 22086 22098 22106-22108 22111 22121-22126 22129-22130 22136 22140 22142-22143 22149 22152 22163-22165 22167 22170 22173-22175 22177 22183 22195 22197 22199-22200 22207 22212 22214-22215 22220-22222 22224 22227-22228 22231 22233-22235 22256 22258-22259 22261-22263 22310 22313 22322 22330 22358 22367 22375 22381 22385 22389 22393 22397-22402 22404-22405 22408 22418-22420 22432-22434 22439-22440 22442-22443 22466 22478 22484-22485 22489 22491-22493 22495-22496 22513 22516-22517 22774 22776 22778-22779 22781 22801 22809-22811 22833 22835 22844-22845 22884-22885 22888-22889 22891 22893-22895 22906-22909 22911 22952 22954 22975 22977 22979 22985 22988-22989 22991 22996 22998 23004 23012 23014 23018 23021-23022 23024-23025 23027 23033 23039 23106 23113 23115 23118-23119 23121 23132-23133 23137 23143 23221 23240-23241 23246 23265 23267-23268 23298 23333 23335 23341 23350 23352-23353 23355-23356 23358-23360 23365 23367 23372-23373 23375 23387 23396 23398 23400 23408-23409 23412 23414 23417 23441 23444 23459 23463 23467-23469 23480-23482 23496-23498 23500-23501 23503 23505 23507 23517-23519 23541-23543 23552 23554-23555 23559 23564 23566 23569-23570 23573 23576 23588 23591-23594 23596 23598 23610 23617 23620-23621 23629 23631 23640-23641 23643 23659 23663 23665-23667 23681 23683 23697-23699 23704 23719 23721 23730-23731 23745 23747 23749-23751 23753 23757-23759 23781 23783 23786 23788 23793 23795 23798 23802 23806 23814 23820 23836 23839 23841-23842 23844 23846 23849 23852 23854 23863 23865-23866 23869 23871 23874 23878-23881 23886-23887 23890 23896 23904 23910-23911 23913 23915 23918 23921 23923 23928 23937 23939 23945-23947 23966-23969 23971-23973 23975 23977 23979 23988 23990-23991 24024-24026 24028-24029 24032-24033 24035 24048 24050 24052-24053 24060 24069 24077 24084-24086 24092-24093 24101 24117 24131 24147-24149 24157 24181 24191-24194 24196 24198-24201 24203 24214-24215 24223-24225 24227-24228 24230 24236-24237 24242-24244 24246-24247 24249-24251 24253-24254 24258 24264-24266 24281 24283 24285 24288 24290-24291 24293-24294 24296-24298 24300-24301 24306-24307 24309-24311 24313 24316 24320 24328 24330-24331 24344-24346 24348-24350 24352 24354-24355 24357-24359 24364-24365 24367 24374 24388 24392-24394 24396-24397 24400-24401 24403 24409 24413-24414 24416 24418 24424 24426-24427 24431 24433 24437 24441 24443 24451 24456-24458 24472-24473 24475-24478 24480-24481 24483-24485 24487-24489 24491 24496 24503-24504 24506-24507 24512-24514 24516-24517 24519-24520 24525 24530-24531 24534 24538-24542 24545 24550-24551 24556 24559 24561-24564 24566 24570 24573-24575 25468-25469 25574 25587 25709 25713-25714 25719-25720 25723 25810 25812 25846-25847 25947 25970-25971 25980 25997-25998 26002 26018 26022 26028 26031 26033 26040 26045 26059 26079 26084 26094 26154 26167 26169-26170 26183 26190 26198 26202-26203 26209 26216-26217 26222 26225 26231 26244 26247 26253 26263 26265 26268 26270-26271 26277 26283 26286 26288-26290 26292 26294 26297 26300 26302 26306-26307 26328 26332 26335 26355 26359 26369 26380 26383 26401-26402 26406-26407 26409 26413 26416-26417 26424 26458 26469 26471 26481 26483-26484 26486 26494 26534 26538 26541-26542 26548 26561 26563-26565 26572 26577-26578 26581 26604 26615 26860 26983 26985 26994 27001-27003 27009 27011 27071 27073 27075-27078 27088-27089 27095-27096 27102 27123 27135 27148 27150 27173 27175 27177 27180 27182-27183 27186-27187 27192 27194 27196 27198 27243 27245 27263 27266 27269 27271 27276 27281-27282 27288 27296 27298 27303 27307 27311 27332 27334 27336 27341 27352 27354 27361 27365 27375 27380 27384 27388 27409-27411 27414 27416 27419 27433 27436-27437 27439 27441-27443 27446-27447 27450 27459 27464-27466 27468 27470 27477 27480 27482-27483 27489 27493-27495 27504-27505 27507-27508 27510 27513-27514 27518 27521 27525-27526 27537 27539 27542 27546-27547 27555 27559 27561 27571 27584 27588 27597 27619 27621 27626-27627 27640-27641 27644-27646 27649 27653 27663 27666 27671 27684 27687 27692 27737 27759 27764 27786-27787 27789 27816-27817 27819-27820 27826 27829 27834 27843 27849-27850 27853 27856-27858 27868 27872-27873 27878 27881 27884 27886 27897 27932-27933 27937-27938 27950-27951 27959 27962 27969 27971 27981 27983 27990 28004 28011 28013 28031 28041 28050 28052 28060 28087 28091 28095 28103 28113-28115 28119 28121 28124-28125 28137 28140 28147-28148 28157 28164 28192 28195 28208 28222-28223 28240-28241 28243-28244 28249 28254-28256 28258 28276 28304 28307-28308 28340-28341 28346 28354 28361 28367 28370 28384 28386 28389 28394 28396 28400 28411 28413 28432-28433 28436 28439 28441-28442 28445-28446 28467 28471 28481-28483 28485 28491 28501 28506 28515 28517 28519 28525 28528 28535 28537 28540 28543 28548 28552 28562 28570-28571 28574 28576 28587 28589 28592-28593 28595 28599 28605 28620 28623 28627 28631 28634 28637 28640-28642 28644-28646 28650-28653 28657-28658 28666 30040 30202 30205-30206 30210-30211 30215-30218 30221-30223 30240-30241 30256 30258 30544-30545 30549 30553 30557-30558 30909 31019 31108 31110 31242-31243 31246 31267-31268 31270 31277 31280 31291 31301-31302 31383 31392 31407 31464 31470 31500 31502 31548 31593 31608 31656 31658 31699 31705 31708 31711 31755 31778-31779 31783-31784 31787 31791-31792 31799 31802 31805 31835 31850 31857 31875 31895 31912 31916 31940 31981-31982 32013 32024-32025 32027-32028 32030 32037 32050-32053 32055-32057 32061 32096 32098 32182 32188-32189 32260 32263 32265 32272 32274-32275 32285 32321 32323 32325-32327 32329 32332 32372-32373 32380 32382 32398 32444 32454 32457 32469 32474 32476 32487 32490 32500-32501 32505 32509 32511 32523 32526 32545-32546 32548 32551-32552 32561 32569 32571-32572 32577 32580-32581 32585-32586 32591 32600 32602 32604 32607 32613 32624-32626 32629 32649-32650 32652 32657-32660 32665-32666 32673 32675-32676 32681-32683 32685 32694-32696 32698-32699 32701 32707 32730 32734 32741 32743 32756 32758 32760 40958 44954 44967 44975 44979https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/280/24?format=asciiOpticaldefaultJ/ApJS/280/24/table3Basic information of the 41,996 H{alpha} emission line starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOBSID[588903058/1127014206] LAMOST observation identifiermeta.id;obslongprimaryYSOcdata for the YSO candidates and potentially LPV contaminated sources (link to Table 4)meta.ref.urlcharLAMOSTLAMOST designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000[-11/88.5] Declination (J2000)degpos.eq.dec;meta.mainindexedGaia? Gaia DR3 identifiermeta.id.crossnullableOTypeType from SIMBAD cross-matchingsrc.classcharTypeType from visual inspection (1)src.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJS/280/24/table4Basic information of the 4,255 YSO candidates and the 78 sources potentially contaminated by LPVrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOBSID[589105026/1126212122] LAMOST observation identifiermeta.id;obslongf_OBSID[*?] Flag on OBSID (1)meta.codecharLAMOSTLAMOST designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-10/79.2] Declination (J2000)degpos.eq.dec;meta.mainGaia? Gaia DR3 identifiermeta.id.crossnullable[NII][0/1] Detection of the [NII]6548+6583A lines (1=line was observed; 0=not detected)meta.codeint[OI][0/1] Detection of the [OI]6300+6364A lines (1=line was observed; 0=not detected)meta.codeintHeI[0/1] Detection of the HeI6678A line (1=line was observed; 0=not detected)meta.codeint[SII][0/1] Detection of the [SII]6717+6731A lines (1=line was observed; 0=not detected)meta.codeintEW[-242.7/0] H{alpha} equivalent width; Angstroms0.1nmspect.line.eqWidthfloat