Halpha emission-line stars from LAMOST MRS DR7 J/ApJS/281/65 ivo://CDS.VizieR/J/ApJS/281/65 CDS Yu L. Li J. Wang J. He T. Han Z. 2026-08-13T05:50:50Z 2026-08-13T06:41:47Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr emission-line-stars visible-astronomy spectroscopy Stars that exhibit prominent emission lines in their spectra are referred to as emission-line stars, encompassing a wide range of stellar types and indicative of intriguing physical properties. The Large Sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) has released millions of spectra from its Medium-Resolution Survey (MRS). A small fraction of these spectra exhibit emission lines, yet they remain undiscovered and unanalyzed due to being buried in the vast dataset. We have developed a method based on derivative spectroscopy, which provides a novel approach for detecting and identifying emission-line stars by extracting signals from complex backgrounds and estimating spectral line profiles. Applying this method to the H{alpha} spectral line profiles from the LAMOST-MRS Data Release 7, we compiled a catalog of emission-line stars using the second- and third-derivative spectra for automated peak detection. This approach also facilitates the classification of H{alpha} emission-line morphologies through a simplified scheme. The catalog comprises 56,649 spectra with relatively prominent H{alpha} emission lines from 45,206 unique stars, with each emission-line component accompanied by approximate estimates of its wavelength, amplitude, and width. All H{alpha} spectral lines were classified into three morphological classes under a unified classification scheme: single emission peak (83.0%), double emission peaks (5.6%), and P Cygni-type profiles (11.5%), which encompass both P Cygni and inverse P Cygni features. Through cross-referencing with SIMBAD, 39,497 stars represent new emission-line sources discovered in our research. 2025ApJS..281...65Y https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/65 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017) V/156 : LAMOST DR7 catalogs (Luo+, 2019) V/162 : LAMOST DR11 catalogs (Luo+, 2026) J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994) J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000) J/AJ/128/2965 : Red variables in the NSVS (Williams+, 2004) J/ApJ/667/308 : Weak-line T Tauri in Spitzer c2d Survey. II. (Cieza+, 2007) J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009) J/A+A/548/A79 : INTEGRAL-OMC opt. variable sources (Alfonso-Garzon+, 2012) J/ApJ/756/27 : Classif. of sources from the 2XMMi-DR3 cat. (Lin+, 2012) J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSOs (Megeath+, 2012) J/ApJ/773/54 : Var. stars in & around NGC2264 with BEST (Klagyivik+, 2013) J/A+A/560/A4 : Rotation periods of active Kepler stars (Reinhold+, 2013) J/other/IBVS/6106 : RR Lyrae stars in GCVS observed by the QES (Bramich+, 2014) J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014) J/ApJS/213/34 : Veloc. of Cygnus OB2 massive binaries (Kobulnicky+, 2014) J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014) J/A+A/579/A19 : K2 Variable Catalogue (Armstrong+, 2015) J/AJ/149/7 : SDSS-III/APOGEE. I. Be stars (Chojnowski+, 2015) J/AJ/150/97 : Rvel in M67. I. 1278 candidate members (Geller+, 2015) J/A+A/581/A52 : Gaia-ESO Survey: Ha emission stars cat. (Traven+, 2015) J/A+A/581/A66 : UV variability and accretion in NGC 2264 (Venuti+, 2015) J/ApJ/823/114 : Cannon: a new approach to determine masses (Ness+, 2016) J/ApJS/232/16 : Mira stars discovered in LAMOST DR4 (Yao+, 2017) J/ApJS/236/27 : APOGEE-2 survey of Orion Complex (OSFC). I. (Cottle+, 2018) J/AJ/156/241 : Variable stars measured by ATLAS (Heinze+, 2018) J/ApJ/868/70 : Hot subdwarf stars from Gaia DR2 & LAMOST DR5 (Lei+, 2018) J/AJ/157/196 : Close companions around young stars (Kounkel+, 2019) J/MNRAS/487/3505 : Variable stars in NGC 2244 (Michalska, 2019) J/ApJ/872/137 : Abund. of red clump & RGB with APOGEE (Shetrone+, 2019) J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020) J/A+A/639/A63 : Active red giants asteroseismic & rot. (Gaulme+, 2020) J/A+A/643/A122 : Active deep learning in large sp. surveys (Skoda+, 2020) J/A+A/638/A21 : Herbig Ae/Be & classical Be stars catalog (Vioque+, 2020) J/ApJS/246/9 : Stellar param. of LAMOST stars using SLAM (Zhang+, 2020) J/MNRAS/495/1252 : Magnetic activity based on LAMOST and Kepler (Zhang+, 2020) J/MNRAS/501/5927 : New classical Ae stars using LAMOST DR5 (Anusha+, 2021) J/MNRAS/500/4849 : GALAH emission-line stars (Cotar+, 2021) J/other/RAA/21.288 : Hot emission-line stars in LAMOST DR5 (Shridharan+, 2021) J/ApJ/937/110 : B-type stars abund. from LAMOST DR5 LRS sp. (Liu+, 2022) J/ApJS/260/35 : Classical Be stars from LAMOST MRS DR7 (Wang+, 2022) J/ApJS/259/38 : Ha em.-line stars & Herbig Ae/Be from LAMOST (Zhang+, 2022) J/ApJS/267/5 : S-type stars from LAMOST MRS DR10 spectra (Chen+, 2023) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/281/65 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/281/65 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/281/65 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/281/65 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/281/65 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/281/65 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/281/65/table3 (Catalogue of H{alpha} emission line stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/281/65/table3? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/281/65/table3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/281/65/table3? 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20365 20367 20377-20379 20385 20387 20389 20391 20397 20400 20402 20404 20477-20479 21351 21357-21359 21365 21373-21375 21391 21395 21398 21413 21428-21430 21436 21450 21452-21453 21460-21462 21464-21466 21468 21868 21871 21881 21884 21886-21887 21953-21958 21964-21965 21967 21972 21974 21976 22011-22012 22015 22054 22086-22087 22090-22093 22095-22096 22098-22099 22102 22113 22115 22121 22123 22132 22134-22135 22140 22148 22170-22171 22174 22181 22183 22209 22218-22219 22224 22226-22227 22230 22236 22238 22256 22258-22259 22331 22334 22353 22356 22358-22359 22361 22375 22381 22390-22391 22393 22395 22440 22442-22443 22449 22452-22453 22464 22466 22472-22474 22485-22489 22492-22493 22495-22496 22803 22806-22807 22809-22811 22841 22844-22845 22856 22858-22859 22868 22870-22871 22880-22882 22884-22885 22888 23106-23107 23112-23113 23115 23128 23130 23137 23139 23152-23153 23418-23419 23422 23459 23462-23465 23485 23487 23501 23503 23521 23523 23525-23527 23540-23542 23548 23550-23551 23569 23572-23573 23616-23617 23620-23621 23640-23641 23643 23663 23678-23679 23727 23729 23731 23747 23784 23786-23787 23792-23794 23800 23859 23865 23867 23910 23916 23918-23919 23930 23939 23945 23947 23969 23981-23983 24052-24054 24056-24058 24060-24062 24070 24101 24106-24107 24112 24115-24118 24128 24130 24192-24194 24196 24198-24199 24219 24222-24225 24227-24230 24263 24265-24266 24285-24287 24292-24294 24304 24309 24311 24323 24329 24356-24357 24367-24369 24371-24372 24374-24375 24388-24390 24397-24399 24408-24409 24411-24414 24417-24418 24424 24426-24427 24430-24431 24433 24436-24437 24444 24446-24447 24449-24451 24476-24478 24480-24482 24489-24491 24496-24498 24512-24514 24540-24542 24554 24575 25708-25709 25711 25713-25715 25718-25719 25724-25726 25808-25810 25812 25815 25823 25845-25847 25984 25991-25993 25995 25997-25999 26002 26004 26006-26009 26011-26012 26014-26015 26019-26020 26022-26023 26027 26030-26033 26035-26036 26042 26157 26159 26169-26171 26174 26195 26198 26202 26204-26205 26224-26225 26229 26231 26253 26256 26258-26259 26264-26265 26267-26268 26270-26271 26277 26279 26288 26290 26292 26294 26297 26300-26302 26305-26307 26312 26315 26318 26337 26340 26369 26372-26374 26376 26380-26381 26383 26385-26386 26390 26392 26491 26494 26577 26580-26582 26585 26587 26607 26613 26616 26979 26982 26987-26988 26991 26994-26995 27000 27002-27003 27072 27074-27075 27077-27082 27086-27087 27093 27095-27097 27099-27102 27110 27120 27123 27127-27128 27132 27134 27148-27150 27162 27173 27181 27186 27190 27192 27243 27245 27247 27254-27255 27260-27261 27263 27328-27330 27332 27334 27339-27341 27343-27344 27346-27347 27349 27352 27354 27365 27405 27409-27412 27414 27416-27417 27419 27440-27441 27443 27458-27459 27464-27466 27480 27482 27488 27490-27491 27493-27495 27500 27502 27505 27510 27513-27515 27518 27541 27584-27585 27588-27589 27597 27604 27627 27629-27630 27640-27641 27644-27646 27649 27652 27656 27666 27672 27675 27681 27684 27686-27688 27691-27692 27698 27777-27778 27861-27862 27869 27871 27947 27969 28030-28031 28034-28035 28038 28040-28041 28064-28065 28068 28087 28089-28091 28118-28119 28121-28123 28125 28137-28138 28141 28145-28148 28150-28151 28154-28155 28441 28443 28445-28446 28462 28484 28488-28489 28491 28494 28496-28498 28506-28507 28509 28511 28529 28540 28548 28551-28552 28555 28570 28576-28577 28581 28597 28599 28605 28618-28620 28622-28623 28629 28631 28637 28639 28648 28650-28654 28661 30023 30035 30038 30040-30041 30043 30047 30064 30209-30211 30226 30240-30241 30243 30252-30253 30837 30839 30845 30847 31009-31011 31032 31034 31103 31108 31120 31403-31404 31406-31407 31417 31419 31684 31686-31689 31691-31692 31694-31695 31704 31706-31707 31716-31717 31719 31725 31728 31730 31778-31779 31782-31783 31794 31802 31872-31873 31876-31877 31879 31888 31933 31970-31971 31976 31978-31980 31982-31983 32182-32183 32185-32189 32224 32226 32232 32234-32235 32276 32322-32326 32328 32375 32381-32382 32415 32454 32456-32458 32460 32462 32474 32480 32482 32487 32497 32499-32500 32502 32505 32507 32523 32526 32529 32534-32535 32545-32548 32550-32551 32556-32558 32562 32576 32578 32580-32581 32585-32586 32588 32592 32600 32640-32641 32643-32645 32650 32673-32675 32687 32694-32695 32698-32701 32703 32715 32742 32744 32746 32749 49148-49149 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/281/65?format=ascii Optical default J/ApJS/281/65/table3 Catalogue of H{alpha} emission line stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST designation (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char m_LAMOST Number of spectra for this target meta.number int nullable OName Source ID from SIMBAD meta.id char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-10/79] Declination (J2000) deg pos.eq.dec;meta.main indexed FileName FITS file name of LAMOST-MRS meta.id;meta.file char Flags Morphological categories of H{alpha} lines (1) meta.code.error char Type Object classification reported in literature meta.code.class;src.class char HII Projected on HII regions? Y=Yes, N=No meta.code char [NII] Presence of [NII] emission? Y=Yes, N=No meta.code char lamB [6548/6552]? Central wavelength of [NII] line at blue side; Angstroms 0.1nm em.wl.central;spect.line float nullable lamR [6583/6587]? Central wavelength of [NII] line at red side; Angstroms 0.1nm em.wl.central;spect.line float nullable lam1 [6558.6/6571]? Central wavelength of first peak; Angstroms 0.1nm em.wl.central;stat.max double nullable lam2 [6559/6571]? Central wavelength of second peak; Angstroms 0.1nm em.wl.central;stat.max double nullable lam3 [6561.8/6571]? Central wavelength of third peak; Angstroms 0.1nm em.wl.central;stat.max double nullable lam4 [6564.2/6571]? Central wavelength of fourth peak; Angstroms 0.1nm em.wl.central;stat.max double nullable lamErr [0.0016/0.5]? Statistical error of central wavelength; Angstroms 0.1nm stat.error;em.wl.central float nullable Amp1 [0/279.5]? Amplitude of first peak src.var.amplitude float nullable Amp2 [0.05/50.1]? Amplitude of second peak src.var.amplitude float nullable Amp3 [0.05/1.3]? Amplitude of third peak src.var.amplitude float nullable Amp4 [0.28/0.93]? Amplitude of fourth peak src.var.amplitude float nullable AmpErr [0.04/0.3]? Statistical error of amplitude stat.error;src.var.amplitude float nullable w1 [0.3/5.6]? Width of first peak; Angstroms 0.1nm spect.line.width float nullable w2 [0.3/4.7]? Width of second peak; Angstroms 0.1nm spect.line.width float nullable w3 [0.3/5.8]? Width of third peak; Angstroms 0.1nm spect.line.width float nullable w4 [0.9/2.9]? Width of fourth peak; Angstroms 0.1nm spect.line.width float nullable wErr [0.04/0.54]? Statistical error of width; Angstroms 0.1nm stat.error;spect.line.width float nullable SNR [0/999]? Signal-to-noise ratio stat.snr float nullable