J/ApJS/275/24ivo://CDS.VizieR/J/ApJS/275/24CDSLiu Z.Cui W.Gu J.Shi J.Hu G.Wang X.-L.Huo Z.2026-06-24T07:41:30Z2026-06-24T08:31:29ZCDS support team

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

cds-question@unistra.frob-starsvisible-astronomyspectroscopystellar-spectral-typessurveystrigonometric-parallaxIn this work, we update the catalog of OB stars based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7 and modify the OB stars' selection criteria in spectral line indices' space. The new catalog includes 37,778 spectra of 27,643 OB stars, of which 3827 OB stars are newly identified. The spectral subclasses of 27,643 OB stars are obtained using the automatic classification code MKCLASS. We find that the modified OB star selection criteria can better improve the completeness of late B-type stars by analyzing their spectral classification results given by MKCLASS. We also identify 3006 Be-type stars or candidates by examining the Balmer lines in their spectra and find that the frequency of our Be-type stars (10.9%) is consistent with previous results. The spatial distribution of OB stars indicates that they are mainly located in the Galactic disk. This new catalog of OB stars will provide valuable data for studying the structure and evolution of the Milky Way.2024ApJS..275...24Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/275/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)V/156 : LAMOST DR7 catalogs (Luo+, 2019)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)V/162 : LAMOST DR11 catalogs (Luo+, 2026)J/A+AS/96/269 : Stellar Models from 0.8 to 120 Msolar (Schaller+, 1992)J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)J/AJ/122/248 : h and chi Per UBVI,H{alpha} photometry (Keller+, 2001)J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005)J/A+A/457/265 : The VLT-FLAMES Survey of Massive Stars (Dufton+, 2006)J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006)J/A+A/472/577 : NGC 330 Be stars and binaries (Martayan+, 2007)J/A+A/496/841 : VLT-FLAMES survey of massive stars (Hunter+, 2009)J/A+A/530/A108 : VLT-FLAMES Tarantula Survey (Evans+, 2011)J/A+A/537/A146 : Stellar models with rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)J/A+A/539/A143 : Nearby B-stars stellar param. and abundances (Nieva+, 2012)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)J/ApJS/224/4 : GOSSS III. Additional O-type systems (Maiz Apellaniz+, 2016)J/AJ/155/91 : Be stars in open clusters with PTF/iPTF. I. (Yu+, 2018)J/MNRAS/487/1400 : Spiral structure as revealed by O and B stars (Chen+, 2019)J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019)J/ApJ/886/27 : SNe IIP progenitors. I. LMC giant comparison (Wagle+, 2019)J/ApJS/246/9 : Stellar parameters of LAMOST stars using SLAM (Zhang+, 2020)J/ApJS/253/54 : Galactic O-type stars from LAMOST spectra (Li, 2021)J/A+A/645/L8 : Plx & proper motions of OB stars from Gaia EDR3 (Xu+, 2021)J/A+A/650/A112 : Mapping hot luminous stars in the Galaxy (Zari+, 2021)J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)J/A+A/662/A66 : Hot stars from LAMOST DR6 (Xiang+, 2022)J/A+A/674/A212 : Sp. sample of Galactic O9-B9 SGs (de Burgos+, 2023)J/A+A/687/A228 : Luminous blue stars sp. analysis (de Burgos+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/275/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/275/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/275/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/275/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/275/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/275/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/275/24/table2 (Information for 37,778 spectra of 27,643 OB stars identified in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/24/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/24/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/24/table2?GETtext/xml+votable180.050000true73.989916721.249750.0055555555555555563/27-28 347 371-372 374 380 382 4/80-81 83-86 89-92 94 101 103 120-122 187-188 195-196 198-199 201 203 873 901 923 1379 1381-1382 1385 1400 1402 1478-1479 1494 1500 1502 1508-1509 1511 1516 1524 1532 1534 5/93 259-261 272 274 278-280 285-286 301 305-306 310-313 315-317 319 328-329 331 348 350-351 353-355 374 380 382 388-389 399 402 409 421-423 427-429 431 466-467 470 472 475 492-493 496 504 606 623 626 639 710-711 716 725 727 730-732 734-735 743 747 756-757 769 772 774-776 778 788 801 808 810-811 816 832 834 840 896-898 900-901 906-907 928 1594 1690 1706-1707 1721 3146 3256 3258 3262 3321-3324 3467 3488 3490 3513 3526 3533 3545 3547-3550 3556 3558-3559 3564-3565 3568-3570 3576 3597 3608 3650 3653 3655 3657 3659 3661 3664 3669-3673 3675-3678 3683 3686 3688 3691 3698-3699 3706 3708 3730 3733 3780 3840-3841 3850 3857 3860 3862 3872 5361 5364 5367 5373 5433 5438-5439 5449 5482 5496 5507 5510-5511 5513 5523 5534 5538 5547 5549-5551 5568 5570-5571 5579 5582 5594 5614-5615 5627-5628 5713 5889 5892-5893 5895 5900-5901 5904 5906-5907 5909-5911 5926-5927 5929 5933-5934 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26187 26190 26201 26217 26257 26285 26294 26301 26325 26340 26354 26357 26379-26380 26383 26400 26413 26415 26437 26446 26453 26500 26536 26567 26583-26584 26586-26588 26591-26592 26598 26608-26609 26611 26613 26621 26847 26902 26925 26937 26946 26960 26966 26969 26984 27051 27065 27074-27075 27090 27097 27106 27120-27121 27143 27172 27182-27183 27190 27215 27232 27248 27279 27282 27289 27291 27307 27309 27312 27321 27334 27350 27358 27362 27378 27399 27434 27464 27498 27535 27550 27557 27562 27574 27596 27603 27609 27632 27639 27651-27652 27679 27686 27702 27712-27713 27737 27749 27751 27783 27793 27818 27841 27844 27861 27863 27866 27911 27940 27949 27956 27966 27976 27985-27987 28001 28016 28040 28067 28086 28112 28138 28145 28154 28169-28170 28190 28193 28195 28201 28208 28221 28225 28238 28267 28271 28401 28413 28421 28442-28443 28447 28482 28487 28492 28517 28520 28536 28577 28586 28627 28631 28633 29651 29662 29683 29686 29927 29933-29935 29938-29940 29942 29948-29950 30174 30197-30198 30204 30250-30251 30277 30288 30293-30294 30301 30303 30314-30315 30318 30325 30338 30345-30346 30359 30369-30370 30376 30380 30383 30386 30389-30392 30396 30398 30400 30402 30407 30412-30413 30432 30435 30438-30439 30446 30453 30466-30467 30470-30471 30490 30496-30498 30500-30502 30549 30557 30579 30581 30584 30586 30589-30591 30661 30672 30674-30675 30677-30679 30681 30685 30954 30968 31018 31021 31030 31037 31047-31048 31051 31054 31062-31063 31066 31075 31080-31081 31087 31091-31092 31097 31104 31107 31116 31123-31126 31138 31157 31162 31171 31177 31203-31204 31208 31227 31286-31287 31299 31301-31302 31305 31321 31325 31336 31343 31356 31375 31384 31395 31403 31407 31410 31421 31425 31434 31439 31445-31446 31466 31470 31531 31544 31546 31549 31562 31575 31580 31587 31592 31606 31612 31621 31624-31625 31654 31673 31686-31687 31692-31693 31714 31721 31731 31733 31746 31752 31755-31756 31764 31767-31768 31773 31783 31785 31788 31790 31798 31801 31812-31813 31816 31822 31833 31844 31846 31852 31854 31856 31859 31861 31867-31868 31870 31875 31907 31913 31926 31933 31945 31948 31952 31956-31957 31959 31963 31973 31985 31990 32034 32061 32063 32099 32105 32126 32129 32138 32148 32163 32165 32167 32170-32171 32175 32186-32187 32212 32241 32245 32269 32277 32280 32282 32287 32291 32294-32295 32310 32331-32332 32335 32356 32365 32372 32375 32377 32383 32411 32431 32433 32436 32439 32458 32465 32475 32505 32511-32512 32515 32519 32521 32528 32531 32537 32550 32555 32558 32572 32577 32589 32606-32607 32632 32649 32658-32659 32663-32665 32667 32670 32704 32712 32719 32734 32750 32754 32758-32759 36837 36857 40882 40886 40922 40935 40937 40939-40940 45034-45035 45045https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/275/24?format=asciiOpticaldefaultJ/ApJS/275/24/table2Information for 37,778 spectra of 27,643 OB stars identified in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsid[215136/746914117] LAMOST DR7 observation identifiermeta.id;obs.param;obslongLAMOSTLAMOST DR7 designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharm_LAMOSTNumber of observations for this LAMOST sourcemeta.numberintnullableS/N[15/999] Signal-to-Noise in the g bandstat.snr;em.opt.BfloatMKSpTMK classificationsrc.spTypecharSSpTSimbad classificationsrc.spTypecharSpTManual classification (1)src.spTypecharGaia? Gaia EDR3 identifiermeta.id.crossnullableplx[0.0007/22.2]? Gaia EDR3 parallaxmaspos.parallax.trigfloatnullablee_plx[0.008/1.7]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullableDist[85.4/27124]? Distance (2)pcpos.distancedoublenullableE_Dist[0.2/16441]? Upper uncertainty in Distpcstat.error;stat.max;pos.distancedoublenullablee_Dist[0.17/11412]? Lower uncertainty in Distpcstat.error;stat.min;pos.distancedoublenullablePapIDisplay data from Paper I (Liu+ 2019, J/ApJS/241/32 if anymeta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from LAMOST names (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from LAMOST names (declination part)degpos.eq.dec;meta.mainindexed