Early-type star param. from LAMOST LRS & MRS J/ApJS/257/54 ivo://CDS.VizieR/J/ApJS/257/54 doi:10.26093/cds/vizier.22570054 CDS Guo Y. Zhang B. Liu C. Li J. Li J. Wang L. Liu Z.,Hou Y.-H. Han Z. Chen X. 2022-09-30T21:59:21Z 2022-04-08T10:19:02Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr chemical-abundances effective-temperature early-type-stars surveys visible-astronomy spectroscopy Massive stars play key roles in many astrophysical processes. Deriving the atmospheric parameters of massive stars is important to understanding their physical properties, and thus the atmospheric parameters are key inputs to trace the evolution of massive stars. Here we report our work on adopting the data-driven technique called stellar label machine (SLAM) with the nonlocal thermal equilibrium TLUSTY synthetic spectra as the training data set to estimate the stellar parameters of Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) optical spectra for early-type stars. We apply two consistency tests to verify this machine-learning method and compare stellar labels given by SLAM with the labels in the literature for several objects having high-resolution spectra. We provide the stellar labels of effective temperature (Teff), surface gravity (logg), metallicity ([M/H]), and projected rotational velocity (vsini) for 3931 and 578 early-type stars from the LAMOST low-resolution survey (LRS) and medium-resolution survey (MRS), respectively. To estimate the average statistical uncertainties of our results, we calculated the standard deviation between the predicted stellar label and the prelabeled published values from the high-resolution spectra. The uncertainties of the four parameters are {sigma}(Teff)=2185K, {sigma}(logg)=0.29dex, and {sigma}(vsini)=11km/s for MRS, and {sigma}(Teff)=1642K, {sigma}(logg)=0.25dex, and {sigma}(vsini)=42km/s for LRS spectra, respectively. We note that the parameters of Teff, logg, and [M/H] can be better constrained using LRS spectra than using MRS spectra, most likely due to their broad wavelength coverage, while vsini is constrained better by MRS spectra than by LRS spectra, probably due to the relatively accurate line profiles of MRS spectra. 2021ApJS..257...54G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/257/54 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to V/153 : LAMOST DR4 catalogs (Luo+, 2018) V/164 : LAMOST DR5 catalogs (Luo+, 2019) J/A+AS/139/231 : Early-type stars towards the Galactic Centre (Dufton+, 1999) J/A+A/471/625 : VLT-FLAMES survey of massive stars (Trundle+, 2007) J/A+A/496/841 : VLT-FLAMES survey of massive stars (Hunter+, 2009) J/A+A/518/A1 : Galactic massive stars with AstraLux (Maiz Apellaniz, 2010) J/A+A/539/A143 : Nearby B-stars stellar parameters & abundances (Nieva+, 2012) J/ApJ/808/16 : Cannon: a new approach to determine abundances (Ness+, 2015) J/other/RAA/16.138 : LAMOST cat. of early-type emission-line stars (Hou+, 2016) J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019) J/ApJS/253/22 : Ks absolute magnitudes from LAMOST for OB stars (Xiang+, 2021) http://dr7.lamost.org/ : LAMOST DR7 home page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/257/54 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/257/54 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/257/54 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/257/54 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/257/54 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/257/54 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/257/54/table1 (The predicted stellar labels of 16032 LAMOST-LRS (Liu+ 2019, J/ApJS/241/32) early-type stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/257/54/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/257/54/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/257/54/table1? GET text/xml+votable 180.0 50000 true 283.4841 42.5822 0.005555555555555556 Cone search capability for table J/ApJS/257/54/table2 (The predicted stellar parameters of 9238 LAMOST-MRS (Guo+ 2022RAA....22b5009G) early-type stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/257/54/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/257/54/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/257/54/table2? GET text/xml+votable 180.0 50000 true 0.0114 55.88 0.005555555555555556 3/28 347 374 380 382 4/80-81 83-86 89-92 101 103 107 109-111 120-122 183 187-188 193 195 198-199 201-203 208 224 887 901 916 918 923 1382 1400 1402 1477 1485 1487-1488 1490-1491 1500 1509 1511 1524 1532 1534 5/93 119 255 259-260 272 274 279 291 306 311 313 315 319 328-329 331 348 351 353-355 374 376-378 382 399 418 421 433-435 467 492-494 599 606 622 629-631 633 636-637 639 658 704-705 707-708 710 725-727 731 743 747 756-757 760-762 769 779 784-786 788 800-801 816 821 827 840 900-901 904 1068 1562 1581 1664 1666 1679 1689 1705-1707 1721 3180 3256 3262 3321-3323 3429 3435 3467 3492-3494 3521 3527 3533 3536 3538 3541 3543 3545 3547 3554-3555 3559-3561 3563-3566 3568-3570 3572-3573 3575-3576 3580-3581 3597 3608 3650 3653 3655 3657 3661 3670 3676-3678 3686 3688-3689 3691 3698-3699 3706 3708 3735 3777 3780 3785 3850 3857 3860 3862 3872 3888 3905 5339 5342-5343 5361 5364 5433 5438 5513-5515 5518-5519 5523-5524 5526-5527 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23420-23421 23444 23449 23455 23468 23470-23471 23475 23507 23509-23511 23518 23527 23531 23537 23541 23545 23547 23557-23559 23568 23571 23576-23577 23579 23581-23582 23584 23590 23593 23595 23604 23610 23612 23615 23624-23625 23627 23629 23631 23648-23649 23655 23658 23660-23661 23663 23668 23670-23671 23682 23688 23691 23694 23701-23703 23706-23707 23714-23715 23720-23721 23725 23728-23729 23731 23736-23738 23741-23745 23747 23754-23755 23776-23778 23824 23826-23827 23836-23838 23874-23875 23878-23879 23886 23888-23889 23892-23893 23899-23900 23908 23910-23911 23920 23922-23923 23925 23928-23929 23931-23933 23935 24016-24018 24020-24021 24023-24026 24028 24032-24034 24052 24054-24055 24068-24069 24071 24073-24075 24077 24081 24085-24087 24089 24102 24111 24113 24116-24117 24119-24120 24122 24124 24127 24140-24141 24143 24164-24165 24167-24170 24194 24196 24204-24205 24214 24216 24225 24228 24234-24235 24249 24251-24254 24256 24259 24261 24263 24266-24268 24270 24272 24274-24277 24280 24283 24285 24296 24298-24299 24301-24302 24306 24311-24312 24317 24319 24412-24413 24415-24418 24420-24421 24429-24431 24433 24436-24438 24444 24446 24540-24542 24561-24565 24567 24573-24575 25531 25566 25576 25582 25590 25814 25845-25846 25882 25892 25906 25918 25921 25927 25932 25969 25974 25985 26001 26006 26009 26031 26044 26066 26092 26106 26184 26190 26201 26215 26223 26244 26247 26280 26317 26319 26340 26357 26379 26396 26402-26403 26411 26413 26436 26467 26533 26551 26553 26555 26565 26570 26584 26591-26592 26595 26606 26609 26612-26613 26847 26925 26937 26946 26960 27000 27026 27045 27049 27061 27065 27082 27090 27120 27126 27172 27175 27180 27182-27184 27190 27204 27227 27232 27243 27248 27282 27284 27289 27291 27312 27317 27321 27325 27334 27336 27350 27352 27358 27379 27419 27434 27452 27454 27464 27486-27487 27491 27498 27507 27535 27541 27562 27574 27603 27632 27639 27686-27687 27749 27751 27776 27785 27814 27817 27839 27841 27863 27871 27913 27975 27986 27999 28016 28067 28124 28134 28208 28221 28238 28266 28271 28302 28323 28331 28354 28358 28370 28388 28401 28406 28421 28423 28435 28438 28465 28482-28483 28487 28508 28538 28551 28577 28579 28586-28587 28622-28623 28633 29651 29683 29686 29935 29938-29940 29948-29949 30041 30043 30210-30211 30213-30215 30217-30219 30232 30235 30240-30241 30250-30251 30253 30256-30258 30288 30293-30294 30301 30303 30314 30318 30325 30338 30345-30346 30369-30370 30380 30383 30386 30390-30392 30396 30398 30400 30402 30407-30408 30411-30413 30432 30438-30442 30446 30453 30466-30467 30470-30471 30473-30476 30478 30490 30496-30498 30500-30502 30579 30586 30590 30672 30674-30675 30678-30679 30685 30845 31017-31018 31021 31037 31048 31051 31054 31062 31066 31068 31080 31091-31092 31097 31103-31104 31116 31124-31126 31138 31142 31177 31203 31254-31255 31286-31287 31302 31315 31321 31325 31336 31339 31356 31381 31384 31392 31413 31424 31434 31438 31444-31445 31448 31470 31518 31528 31546 31549-31550 31592 31612-31613 31622 31624 31627 31640 31715-31716 31725 31731 31746 31752 31755-31756 31764 31768 31773 31778 31782-31783 31785-31788 31790-31791 31794 31798 31801-31803 31812-31813 31816 31822 31844 31846 31854 31856 31859 31861 31872-31873 31875-31876 31879 31888-31890 31907 31923 31945 31948 31952 31956-31957 31959 31973 31976 31985 32034 32061 32063 32099 32105 32129 32138 32148 32165 32167 32175 32182-32183 32185 32187-32189 32212 32226-32227 32232-32233 32238-32239 32241 32245 32250 32269 32277 32279 32322 32326-32327 32330 32332 32372 32375 32380 32385 32431 32456 32458-32460 32465 32474 32483 32486-32487 32489 32499 32502 32511 32515 32521 32524 32529 32537 32548 32550-32552 32554 32558 32577 32579 32581-32583 32592 32606-32607 32640 32644 32649 32658-32659 32664 32670 32674 32680 32687 32701 32704 32719 32744 32754 32758 36851 36857 36861 40882 40886 40919 40937 40939-40940 40948 45008 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/257/54?format=ascii Optical default J/ApJS/257/54/table1 The predicted stellar labels of 16032 LAMOST-LRS (Liu+ 2019, J/ApJS/241/32) early-type stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ObsID [215136/585213175] Star identifier from LAMOST DR5 meta.id;meta.main long RAJ2000 Right Ascension in decimal degrees (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-9.2/61] Declination in decimal degrees (J2000) deg pos.eq.dec;meta.main indexed SNR [-9999/999] Signal-to-Noise stat.snr int Teff [-36654/69857] Effective temperature K phys.temperature.effective int log(g) [1/6.7] log surface gravity log(cm.s**-2) phys.gravity float [M/H] [-2.6/1.1] Metallicity log(Sun) phys.abund.Z float vsin(i) [0/497] Projected rotational velocity km/s phys.veloc.rotat int Flag Star flag (1) meta.code.error char DR4+DR5 Display the LAMOST DR4 (V/153) and DR5 (V/164) catalogs meta.ref.url char
J/ApJS/257/54/table2 The predicted stellar parameters of 9238 LAMOST-MRS (Guo+ 2022RAA....22b5009G) early-type stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ObsID [589004107/747815206] Star identifier from LAMOST DR7 meta.id;meta.main long RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 [-9.9/77.1] Declination (J2000) deg pos.eq.dec;meta.main MJD [58024.8/58649.2] Modified Julian Date of the observation d time.epoch double SNR-R [2/767] Signal-to-Noise in Red arm stat.snr int SNR-B [2/728] Signal-to-Noise in Blue arm stat.snr int Teff [7081/58781] Effective temperature K phys.temperature.effective int log(g) [1.5/5.4] log surface gravity log(cm.s**-2) phys.gravity float [M/H] [-1.36/0.65] Metallicity log(Sun) phys.abund.Z float vsin(i) [0/312] Projected rotational velocity km/s phys.veloc.rotat int Flag Star flag (1) meta.code.error char