M-type stars in LAMOST DR5 unclassified spectra J/MNRAS/485/2167 ivo://CDS.VizieR/J/MNRAS/485/2167 doi:10.26093/cds/vizier.74852167 CDS Guo Y.-X. Luo A.-L. Zhang S. Du B. Wang Y.-F. Chen J.-J. Zuo F.,Kong X. Hou Y.-H. 2024-08-19T20:17:17Z 2022-11-17T14:36:00Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr spectroscopy m-stars late-type-stars visible-astronomy Our study aims to recognize M-type stars which are classified as 'UNKNOWN' due to poor quality in the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR5 V1. A binary nonlinear hashing algorithm based on Multi-Layer Pseudo-Inverse Learning (ML-PIL) is proposed to effectively learn spectral features for M-type-star detection, which can overcome the bad fitting problem of template matching, particularly for low S/N spectra. The key steps and the performance of the search scheme are presented. A positive data set is obtained by clustering the existing M-type spectra to train the ML-PIL networks. By employing this new method, we find 11410 M-type spectra out of 642178 'UNKNOWN' spectra, and provide a supplemental catalogue. Both the supplemental objects and released M-type stars in DR5 V1 are composed of a whole M-type sample, which will be released in the official DR5 to the public in June 2019. All the M-type stars in the data set are classified as giants and dwarfs by two suggested separators: (1) a colour diagram of H versus J-K from 2MASS, (2) line indices CaOH versus CaH1, and the separation is validated with the Hertzsprung-Russell diagram (HRD) derived from Gaia DR2. The magnetic activities and kinematics of M dwarfs are also provided with the equivalent width (EW) of the H{alpha} emission line and the astrometric data from Gaia DR2 respectively. 2019MNRAS.485.2167G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/2167 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to V/164 : LAMOST DR5 catalogs (Luo+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/2167 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/2167 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/2167 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/485/2167 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/485/2167 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/485/2167 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/485/2167/catalog (Supplemental catalogue of 11410 recognized M-type stars) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/485/2167/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/2167/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/2167/catalog? 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20374-20375 20384 20390 20404 20407 20416-20417 20421-20422 20428 20442-20444 20446-20447 20449 20463 20466-20467 20469-20474 20476 20478-20479 21355 21357-21359 21375 21434 21438-21439 21443 21447 21453 21457 21460 21462 21464 21466 21468 21478 21489-21490 21494-21495 21500-21501 21620 21622-21623 21629-21630 21717 21719 21753-21754 21757 21759 21767 21769-21770 21773-21774 21777 21779 21781-21782 21791 21796 21798-21799 21803 21806 21812 21814 21821 21824 21827 21849 21854-21855 21858 21863 21866 21870-21871 21874 21882 21895 21900 21902 21909 21913 21915 21919 21928 21931 21945-21946 21950 21954 21960 21962 21966-21967 21987-21988 21993 21996 21999-22002 22005-22006 22009 22014-22015 22099 22101 22109 22152 22164 22186-22187 22195 22201 22204-22205 22207 22221 22230 22240 22246 22258 22262 22264 22274 22279 22285 22289-22290 22292 22294 22296 22299 22302-22303 22310 22321 22334 22357 22365 22373 22386 22391 22395 22399 22406-22408 22412-22413 22423-22425 22429 22434-22435 22440 22442 22446 22455 22464 22467-22468 22470 22475-22477 22479 22481-22483 22488-22489 22491-22492 22494-22495 22497 22500 22506-22507 22516 22518 22521 22523 22755 22757-22758 22776-22777 22782 22789-22791 22800 22802 22805-22806 22808 22810 22812 22814 22821 22823 22828-22829 22832-22834 22841 22843 22872-22873 22875 22906-22907 22927 22929 22939 22961 22991 22993 22998 23005-23007 23013 23024 23028 23038-23039 23083 23111 23120-23121 23124 23185 23191 23208-23210 23213 23224 23226 23228-23229 23239-23240 23245-23246 23254 23265-23266 23272-23273 23275 23280 23282 23292 23294 23308 23310-23311 23326-23327 23348 23353 23355 23359 23370 23380-23381 23388 23390 23392 23396 23399 23401 23408 23414 23418 23426 23463 23466-23467 23470 23487-23488 23492-23493 23497 23499 23501-23503 23505 23507 23515 23517 23521 23524 23527-23528 23530-23531 23533-23537 23542 23544 23547 23549-23551 23553 23585-23586 23597 23619 23622 23626 23629 23636 23638 23648 23655 23663 23669 23671 23677-23678 23680 23691 23705 23712 23724-23725 23727 23733 23736 23738 23744-23745 23748 23751 23759 23761 23763 23765 23770 23775 23789 23791 23796 23799 23801 23806 23821 23827 23829-23832 23835-23836 23846-23847 23851-23853 23855-23856 23858-23859 23863-23864 23867 23869 23871 23873 23876 23881 23883 23887 23889 23894-23897 23899 23906 23909 23912-23913 23918-23922 23924 23926 23929-23930 23932-23933 23935-23937 23941-23942 23947 23949-23952 23954 23957 23960 23964 23969 23971-23974 23976-23978 23980 23982-23983 23985 23987-23988 23990-23992 23994-23996 23998 24000 24002 24005-24007 24012 24015 24018-24019 24023 24027-24028 24030-24031 24037-24038 24045 24047 24052-24053 24055 24081 24083 24086 24095 24116 24129-24131 24133 24137-24139 24142 24145 24147-24149 24153 24157-24160 24162 24167 24169 24177 24180 24182 24185 24189 24191 24203 24223 24225-24226 24230-24232 24234 24236-24237 24239 24242 24247-24250 24252 24254 24256-24257 24261 24263 24265 24269-24270 24272 24278 24280-24281 24283 24287-24290 24292 24294-24295 24300 24306 24312-24313 24320 24322-24323 24329-24330 24336-24337 24341-24343 24347 24357 24359-24360 24370-24371 24374-24376 24378-24380 24382-24383 24387 24393 24408-24409 24411-24413 24415 24417 24420 24422 24424-24426 24429 24435 24437-24439 24441-24446 24448-24449 24453-24455 24457-24460 24463 24479 24484 24486-24487 24496 24503-24504 24508 24512 24514 24516 24520-24522 24524 24529 24531 24533-24534 24545-24546 24548 24551 24563 24566 24571-24573 25456-25458 25461-25464 25469-25470 25533 25535 25559 25564 25570 25576-25577 25580 25582 25591 25594-25595 25599 25701 25703 25723 25809 25817 25837-25838 25848 25850 25870 25924 25932-25933 25935 25937 25939 25945 25947-25948 25966-25967 25985 25987 25991 25995 25998 26002 26010 26013 26016 26020-26021 26025 26027 26032 26041 26045-26046 26051 26085 26106-26107 26127 26138 26144 26152 26158-26161 26164 26167 26170-26172 26175 26188-26189 26192 26194 26198-26199 26203-26204 26209 26228 26237 26244 26250 26252 26254 26256-26257 26267-26268 26270 26273-26274 26277-26279 26281 26283-26284 26286 26296 26298 26301 26303 26314 26317-26318 26336 26339 26345-26346 26358-26359 26371 26378 26381 26383 26391 26401 26403-26406 26408 26413 26417 26424-26425 26431 26434 26451 26457-26460 26463 26478 26481 26484 26497 26510 26517 26524 26532-26533 26535 26542 26545-26547 26556 26569 26574 26576 26581 26590 26600 26610-26611 26614-26615 26746 26829 26841 26844 26859-26860 26862 26874 26901 26905 26914 26937 26943-26945 26952 26955-26957 26960-26961 26969-26970 26973-26975 26978 26984 26989-26991 26993-26995 26999 27012 27023 27031 27037 27043 27047 27056 27061-27062 27064 27069 27073 27075 27077 27080 27087 27091 27093 27095-27096 27100 27106 27108 27112 27124 27131 27149 27159 27165 27167 27175 27184 27187 27189 27191 27199-27200 27204 27206-27207 27209 27211-27213 27216 27218 27232 27237 27241-27243 27250 27257 27267 27280-27281 27284 27288 27294 27296 27300 27302 27304 27306-27307 27309 27311 27314 27317-27318 27325 27327-27329 27335 27337 27340 27343-27345 27348 27354 27358 27363 27368-27369 27371 27379-27380 27382 27401 27404 27409 27415 27418 27423 27428 27432 27438 27440-27441 27456 27464 27466 27470 27488 27490 27493 27510 27512 27515 27520 27538-27539 27543-27544 27557 27565 27568 27570 27584-27585 27604 27610 27639 27648-27649 27658-27659 27661-27662 27669 27675 27681 27688 27699 27722 27732-27733 27746-27748 27750 27759-27760 27772 27785 27787 27793 27805 27822 27853-27855 27873 27876-27877 27886 27889-27890 27899-27900 27902 27925 27939 27949 27952 27955 27980 27987 27989-27990 27995 28006 28009-28010 28018-28019 28030 28032 28036 28044 28051 28060 28065 28069 28084 28091 28097 28101 28114 28120 28125-28126 28129 28134-28136 28138-28140 28142-28143 28146 28158 28178 28191 28197-28198 28221 28225 28227 28234-28235 28241 28276 28284 28297 28299 28329 28338-28340 28371 28378 28380 28382-28383 28387 28389-28391 28393 28395-28396 28398-28399 28404 28406-28407 28412-28414 28432 28437 28439 28445 28463 28466 28470-28471 28473 28476 28478-28479 28496 28498-28499 28504 28506-28507 28510-28511 28516-28518 28520-28521 28524-28525 28527 28532 28536-28537 28541 28548-28549 28551 28555 28557-28561 28563 28565 28596 28598-28602 28604-28605 28607 28609-28614 28617-28620 28624 28627 28641 28665 29653-29655 29674 29678-29679 29686 29927 29944 30292 30303 30315 30346-30347 30370 30389 30396 30410 30426 30435-30436 30438-30439 30444 30461 30497 30505 30626 30661 30677 30679 30684-30685 30919 30958 30965 30967 30999 31027 31034 31040 31042 31045 31052 31079 31096 31113 31157-31159 31165 31190 31194 31202 31206 31218 31230 31252 31285 31294 31296-31297 31299-31300 31308 31310-31312 31337-31338 31342-31343 31364-31365 31370 31373 31381 31383 31392-31393 31402-31403 31415 31422 31432 31435 31438 31440 31442-31443 31447-31448 31500 31503 31516 31525 31532 31538 31540 31549 31551 31586 31593 31632 31636 31650 31667 31672 31674 31702 31760 31800 31812 31821 31888 31891 31908 31922-31924 31927-31928 31930 31933-31934 31964 31968 31976 31984 32067 32074 32076 32097 32210 32263 32271 32273 32275 32279 32283 32294-32295 32298 32301 32303 32307 32314 32323 32327 32385 32401 32415 32452 32458 32467-32468 32470 32472-32473 32476 32478 32495 32506-32508 32510 32517 32519 32528 32549 32552 32557 32640-32642 32648-32650 32654 32657 32668 32672 32676 32737 36711 36717-36718 36732 36735 36765 36806 36808 36815 36817 36826 36843 36845-36847 36852 36854 36856-36857 36859-36860 36862-36863 40884 40886 40891 40895 40916 40931-40932 40934 40940-40942 40948-40950 40952-40953 40957 40959 45018 45026 45043-45045 45052 45054 48989 48991 48999 49007 49014 49016 49022 49095 49108 49117 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/485/2167?format=ascii Optical default J/MNRAS/485/2167/catalog Supplemental catalogue of 11410 recognized M-type stars FiberId LAMOST Fiber ID meta.id int RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ID LAMOST object ID (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char ObsDate LAMOST Target observation date time.epoch;obs nullable indexed MJD Modified Julian Day d time.epoch int PlanId LAMOST Plan Name obs.field char specId LAMOST unique spectra ID meta.id int Simbad Simbad column added by the CDS meta.ref.url char SNR Signal to noise ratio of r filter stat.snr;instr.filter float subClass Stellar Sub-Class src.class char HRV Heliocentric radial velocity km/s spect.dopplerVeloc;pos.heliocentric double EWHa ? Equivalent width of H{alpha} line spect.line.eqWidth float nullable e_EWHa ? Error on EWHa stat.error double nullable TiO5 ? Spectral index of TiO5 spect.index float nullable e_TiO5 ? Error on TiO5 stat.error float nullable CaH2 ? Spectral index of CaH2 spect.index float nullable e_CaH2 ? Error on CaH2 stat.error float nullable CaH3 ? Spectral index of CaH3 spect.index float nullable e_CaH3 ? Error on CaH3 stat.error float nullable TiO1 ? Spectral index of TiO1 spect.index float nullable e_TiO1 ? Error on TiO1 stat.error float nullable TiO2 ? Spectral index of TiO2 spect.index float nullable e_TiO2 ? Error on TiO2 stat.error float nullable TiO3 ? Spectral index of TiO3 spect.index float nullable e_TiO3 ? Error on TiO3 stat.error float nullable TiO4 ? Spectral index of TiO4 spect.index float nullable e_TiO4 ? Error on TiO4 stat.error float nullable CaH1 ? Spectral index of CaH1 spect.index float nullable e_CaH1 ? Error on CaH1 stat.error float nullable CaOH ? Spectral index of CaOH spect.index float nullable e_CaOH ? Error on CaOH stat.error float nullable Na ? Line index of Na line spect.index;spect.line double nullable zeta ? Metal-sensitive parameter (Yi et al. 2014AJ....147...33Y; Guo et al. 2015RAA....15.1182G, Cat. J/other/RAA/15.1182) stat.param float nullable e_zeta ? Error on zeta stat.error float nullable Giant Luminosity class (0 for dwarfs, 1 for giants) src.class.luminosity int plx ? Parallax mas pos.parallax.trig double nullable e_plx ? Error on plx mas stat.error;pos.parallax float nullable pmRA ? Proper motion in right ascension mas/yr pos.pm;pos.eq.ra double nullable e_pmRA ? Error on pmRA mas/yr stat.error;pos.pm;pos.eq.ra float nullable pmDE ? Proper motion in declination mas/yr pos.pm;pos.eq.dec double nullable e_pmDE ? Error on pmDE mas/yr stat.error;pos.pm;pos.eq.dec float nullable Dist ? Distance in parsecs from the sun pc pos.distance;pos.heliocentric double nullable U ? Galactic space velocity, the direction towards the center of the galaxy is positive km/s phys.veloc;src.class.starGalaxy;pos.galactic double nullable V ? Galactic space velocity, the direction towards the Milky Way's rotation is positive km/s phys.veloc.rotat;pos.galactic double nullable W ? Galactic space velocity, the direction towards the North Pole of the Milky Way is positive km/s phys.veloc;pos.galactic double nullable zgal ? Verticle Distance from the plane pc pos.cartesian.z;pos.galactic double nullable GLON ? Galactic Longtitude of the object deg pos.galactic.lon nullable GLAT ? Galactic Latitude of the object deg pos.galactic.lat double nullable