Am stars from LAMOST DR5 J/ApJS/242/13 ivo://CDS.VizieR/J/ApJS/242/13 doi:10.26093/cds/vizier.22420013 CDS Qin L. Luo A.-L. Hou W. Li Y.-B. Zhang S. Wang R. Wang L.-L.,Kong X. Han J.-S. 2022-08-26T08:13:48Z 2022-07-28T08:39:10Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr peculiar-variable-stars visible-astronomy spectroscopy stellar-spectral-types two-color-diagrams infrared-photometry trigonometric-parallax line-intensities metallicity The Large Sky Area Multi-Object Fibre Spectroscopic Telescope data release 5 (DR5) released more than 200,000 low-resolution spectra of early-type stars with a signal-to-noise ratio >50. The search for metallic-line (Am) stars in such a large database and a study of their statistical properties are presented in this paper. Six machine-learning algorithms were experimented with using known Am spectra, and both the empirical criteria method and the MKCLASS package were also investigated. Comparing their performance, the random forest (RF) algorithm won, not only because the RF has high successful rate, but because it can also derive rank features. Then the RF was applied to the early-type stars of DR5, and 15269 Am candidates were picked out. Manual identification was conducted based on the spectral features derived from the RF algorithm; 9372 Am stars and 1131 Ap candidates were compiled into a catalog. Statistical studies were conducted including temperature distribution, space distribution, and infrared photometry. The spectral types of Am stars are mainly between F0 and A4 with a peak around A7, which is similar to previous works. With the Gaia distances, we calculated the vertical height Z from the Galactic plane for each Am star. The distribution of Z suggests that the incidence rate of Am stars shows a descending gradient with an increasing |Z|. On the other hand, Am stars do not show a noteworthy pattern in the infrared band. As the wavelength gets longer, the infrared excess of Am stars decreases, until there is little or no excess in W1 and W2 bands. 2019ApJS..242...13Q https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/242/13 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/106 : MK Classification of Visual Multiples (Abt, 1981) III/162 : General Catalogue of Ap and Am stars (Renson+ 1991) III/260 : General Catalogue of Ap and Am stars (Renson+ 2009) V/146 : LAMOST DR1 catalogs (Luo+, 2015) I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018) V/156 : LAMOST DR7 catalogs (Luo+, 2019) J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 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/AJ/153/218 : New IR photometric study of Ap and Am stars (Chen+, 2017) J/ApJS/259/63 : Chemically peculiar stars from LAMOST (Shang+, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/242/13 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/242/13 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/242/13 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/242/13 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/242/13 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/242/13 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/242/13/table8 (Catalog of Am stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/242/13/table8? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/242/13/table8? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/242/13/table8? 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22947 22964-22965 22968-22969 22971 22981 22992 22997-22999 23003-23005 23007 23010 23025 23029 23031 23109 23123-23124 23126 23149 23152 23158 23197 23202 23206 23222 23231 23238 23246 23252 23256 23267-23269 23272 23276 23282 23284 23288 23294 23296 23326 23329 23331 23336-23337 23339 23346 23348 23351 23357-23359 23370-23371 23385 23387 23396-23397 23401-23402 23405 23408-23410 23412 23415-23416 23419-23420 23422-23423 23428 23444-23446 23455 23457 23464 23466 23473-23474 23479 23482-23483 23486 23488 23495 23511-23512 23515 23528 23531-23532 23537-23539 23541-23542 23545-23546 23550 23552 23562 23564-23565 23567-23570 23576-23577 23579 23593 23596-23597 23603-23605 23607 23609-23612 23614-23616 23618-23619 23623 23631 23638 23644-23645 23648 23650 23652 23654-23656 23658-23659 23663-23664 23666 23670 23673 23675 23680 23687 23692 23694-23695 23697-23699 23701 23703 23705-23708 23710-23711 23713 23715 23723 23725 23736-23737 23740-23741 23743-23745 23747 23760 23763 23772-23774 23777-23779 23796 23798-23802 23804-23806 23832 23834-23835 23841-23842 23848 23850-23851 23860-23861 23863 23876-23877 23879 23890-23892 23894-23895 23897-23901 23903 23908 23910-23911 23924 23926-23927 23936-23937 23939 23944-23945 23947 23953-23955 23989-23991 24020-24021 24023 24036-24038 24052-24054 24065 24067-24069 24071 24075-24077 24080 24082-24083 24096 24099 24102-24105 24108 24110 24112 24114 24120-24121 24123 24168-24170 24172-24173 24175 24180-24182 24184-24185 24187 24192 24197-24198 24200 24204 24207 24211 24213-24215 24217 24219 24226-24227 24232 24235-24236 24238 24240-24241 24243 24261-24262 24264-24266 24269 24272 24292 24294-24298 24314 24319 24356 24358-24362 24373-24377 24379 24413 24415-24417 24419 24421-24423 24434-24435 24438 24440 24442-24443 24453 24455 24457 24459 24464-24465 24467 24473 24475 24505-24507 24512 24514-24518 24525-24527 24540-24542 24555 24557-24559 24573-24575 25423 25468 25559 25773 25819 25941-25942 25946 26000 26014 26017 26081 26086 26182 26253 26282 26380 26397 26406 26418 26448 26488 26516 26554 26566 26575-26576 26839 26855 26866 26915 26931 26975 26980 26994 27032 27041 27043 27065 27093 27098 27119 27125 27144 27147 27160 27187 27234 27242 27256 27267 27275 27291 27300 27303 27307-27308 27310 27314 27317 27321 27328 27336 27338 27341 27359 27361 27380 27415 27436 27450 27479 27487-27488 27501 27511 27525 27533 27624 27651 27657 27660 27662 27682 27686 27727 27741 27753 27761 27845 27857 27878 27905-27906 27933 27957 27973 27988 27990 28035 28047 28055 28057 28097 28100 28102 28142 28149 28181 28190 28192 28235 28365 28371 28386-28387 28397 28412 28435 28446 28481 28484 28579 28590-28591 28600 28609 29683 29686 29693 29695 29927 29937-29938 29945 29948 29950 30291 30301 30365 30375 30380 30382 30390-30392 30395 30399 30404-30405 30409 30432 30438-30440 30443-30445 30456 30458 30466 30470 30473 30476 30479 30573 30575 30578 30582 30585-30587 30589 30673 30676-30677 30684-30685 30932 30940 30959 31018 31027 31031 31043 31045-31048 31055 31058 31063-31064 31067-31068 31070 31077 31079 31087 31092 31095-31096 31098 31107 31110-31111 31119 31128-31129 31150 31168-31169 31171 31177 31180 31189 31193 31217 31219 31223 31231 31249 31252 31299 31303 31379 31396 31405 31408 31436 31448 31494 31500 31511 31519 31530 31547 31576 31607 31611 31624 31631 31673 31679 31709 31720 31732-31733 31756 31759 31762-31764 31770 31776 31778 31782 31788-31789 31791 31795 31800-31802 31805 31808 31812 31814 31816-31817 31819 31821-31823 31832 31834 31841-31842 31844 31848 31854-31856 31867 31869 31871-31872 31878 31887 31889 31891-31893 31898 31910 31912-31913 31917 31922 31927 31930 31938 31940 31943 31948 31950-31952 31954 31956-31957 31964 31976 31979 31981 31986 31996-31997 31999 32041 32043 32046 32061-32062 32105 32107 32126-32130 32132 32140 32143 32165-32167 32170-32171 32173-32174 32184 32189-32190 32204 32223 32235 32244 32247 32253 32261 32267 32276 32301 32323-32325 32331 32344 32352 32358 32364 32370-32371 32376-32377 32388 32407 32434 32458 32460 32477 32517 32520 32523-32524 32526 32529-32532 32534-32535 32551 32553 32556 32558 32562 32564 32577 32596 32601 32614 32659 32666-32667 32677 32711 32739 32755 32762 36807-36808 36847 36850 36863 40886 40891 40910 40918 40921 40929 40931 40933 40945 40953-40954 40959 45041 49095 49108 3.830199579824256e-20 1.7003137259100215e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/242/13?format=ascii Optical Infrared default J/ApJS/242/13/table8 Catalog of Am stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Seq [1/10503] Sequential running identifier meta.id int Name Name of FITS file of each spectrum meta.id;meta.file char RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-9.8/61.8] Declination (J2000) deg pos.eq.dec;meta.main indexed Teff [6750/10500] Surface effective temperature (1) K phys.temperature.effective int FeEW [5.8/17.6] Equivalent width, Fe-group lines, observed 0.1nm spect.line.eqWidth float FeEW-m [1.2/14.2] Equivalent width, Fe-group lines, Kurucz template 0.1nm spect.line.eqWidth float KEW [-0.13/5.6] Equivalent width, CaII K line, observed 0.1nm spect.line.eqWidth float KEW-m [0.4/6.8] Equivalent width, CaII K line, Kurucz template 0.1nm spect.line.eqWidth float SpT-K Spectral subtype, CaII K line, src.spType char SpT-H Spectral subtype, Balmer lines src.spType char SpT-m Spectral subtype, metallic lines src.spType char Z [-7299/5684]? Vertical distance from the Galactic plane pc pos.cartesian.z;pos.galactic double nullable rest [42/7362]? Estimated distance (2) pc pos.distance;pos.heliocentric double nullable b_rest [41/6291]? Lower bound on the confidence interval of rest (2) pc stat.fit.param double nullable B_rest [43/9358]? Upper bound on the confidence interval of rest (2) pc stat.fit.param double nullable Plx [0.0063/23.7]? GAIA DR2 Parallax mas pos.parallax float nullable e_Plx [0.012/1.3]? Uncertainty in Parallax mas stat.error;pos.parallax float nullable Jmag [7.47/14.9]? 2MASS J band magnitude mag phot.mag;em.IR.J float nullable e_Jmag [0.017/0.08]? Uncertainty in Jmag mag stat.error;phot.mag float nullable Hmag [7.28/14.8]? 2MASS H band magnitude mag phot.mag;em.IR.H float nullable e_Hmag [0.014/0.08]? Uncertainty in Hmag mag stat.error;phot.mag float nullable Kmag [7.15/14.65]? 2MASS K band magnitude mag phot.mag;em.IR.K float nullable e_Kmag [0.01/0.1]? Uncertainty in Kmag mag stat.error;phot.mag float nullable W1mag [7/14.6]? WISE band 1 [3.4um] band magnitude mag phot.mag;em.IR.3-4um float nullable e_W1mag [0.013/0.05]? Uncertainty in W1mag mag stat.error;phot.mag float nullable W2mag [7/14.6]? WISE band 2 [4.6um] band magnitude mag phot.mag;em.IR.4-8um float nullable e_W2mag [0.014/0.05]? Uncertainty in W2mag mag stat.error;phot.mag float nullable E(B-V) [0.0047/14.5]? Reddening color excess (3) mag phot.color.excess float nullable (J-H)0 [-3.7/0.7]? Extinction corrected J-H color mag phot.color.excess float nullable (H-K)0 [-2.3/0.5]? Extinction corrected H-K color mag phot.color.excess float nullable (W1-W2)0 [-0.4/0.8]? Extinction corrected W1-W2 color mag phot.color.excess float nullable FeH [-0.66/0.95]? LAMOST FeH metallicity phys.abund.Fe float nullable EW4077 [-0.018/1.9] EW of 4077{AA} spectral line, observed spect.line.eqWidth float EW4077-m [0.27/2.1] EW of 4077{AA} spectral line, Kurucz template spect.line.eqWidth float FlAp [0/1] Ap flag column; 1=Ap candidate. meta.code int