LAMOST DR9 white dwarf cand. from deep-learning J/ApJS/268/28 ivo://CDS.VizieR/J/ApJS/268/28 doi:10.26093/cds/vizier.22680028 CDS Tan L. Liu Z. Wang F. Mei Y. Deng H. Liu C. 2024-09-03T20:12:28Z 2024-01-09T11:26:05Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr white-dwarf-stars visible-astronomy spectroscopy astronomical-models White dwarfs represent the ultimate stage of evolution for over 97% of stars and play a crucial role in studies of the Milky Way's structure and evolution. Recent years have witnessed significant progress in using deep-learning methods for identifying unique objects in large-scale data. In this paper, we present a model based on transfer learning for identifying white dwarfs. We constructed a data set using the spectra released by LAMOST DR9 and trained a convolutional neural network model. The model was then further trained using a transfer-learning approach for a binary classification model. Our final model is comprised of a seven-class classification model and a binary classification model. The testing set yielded an accuracy rate of 96.08%. Our proposed model successfully identifies 4314 of the 4479 white dwarfs published in previous papers. We applied this model to filter the 1,121,128 spectral data from the LAMOST DR9 V1 catalog. Subsequently, we obtained 6317 white dwarf candidates, of which 5014 were cross-validated and found to be known white dwarfs. We finally identified 489 new white dwarfs out of the remaining 1303 candidates, containing 377 DAs, 1 DB, 4 DZs, 1 magnetic WD, 101 DA+M binaries, and 1 DB+M binary. Our study also compared transfer-learning methods with non-transfer-learning methods, and the results show that transfer learning provides faster training speed and a higher accuracy rate. 2023ApJS..268...28T https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/268/28 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/129 : Spectroscopically Identified White Dwarfs (McCook+, 1987) III/210 : Spectroscopically Identified White Dwarfs (McCook+, 1999) III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008) V/156 : LAMOST DR7 catalogs (Luo+, 2019) J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004) J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013) J/AJ/146/34 : IR photometry of DA white dwarfs from LAMOST (Zhang+, 2013) J/MNRAS/452/765 : WD candidates using LAMOST DR3 (Gentile Fusillo+, 2015) J/MNRAS/454/2787 : LAMOST DR2 white dwarfs (Guo+, 2015) J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015) J/MNRAS/455/3413 : White dwarf and subdwarf stars in SDSS DR12 (Kepler+, 2016) J/MNRAS/479/415 : Galaxy mergers sample (Ackermann+, 2018) J/MNRAS/480/4505 : A white dwarf cat. from Gaia-DR2 (Jimenez-Esteban+, 2018) J/MNRAS/477/4641 : LAMOST DR5 White dwarf-main sequence binaries (Ren+, 2018) J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019) J/MNRAS/486/2169 : White dwarf and subdwarf stars in SDSS DR14 (Kepler+, 2019) J/MNRAS/482/965 : Age of the Gal. stellar halo from Gaia WDs (Kilic+, 2019) J/other/RAA/19.88 : DB white dwarfs from the LAMOST DR5 (Kong+, 2019) J/MNRAS/508/3877 : Catalogue of white dwarfs in Gaia EDR3 (Gentile+, 2021) J/ApJS/259/5 : Hot subdwarf candidates from LAMOST DR7 (Tan+, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/268/28 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/268/28 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/268/28 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/268/28 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/268/28 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/268/28 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/268/28/table4 (Manual verification results of the 6317 white dwarf candidates) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/28/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/28/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/28/table4? GET text/xml+votable 180.0 50000 true 215.33411 -0.77395806 0.005555555555555556 Cone search capability for table J/ApJS/268/28/table5 (Basic information of 4432 white dwarf candidates) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/28/table5? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/28/table5? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/28/table5? GET text/xml+votable 180.0 50000 true 220.28516694 1.17239389 0.005555555555555556 4/1521-1523 5/212 215 260 284 307 320 322 324 332 344-345 355 360-362 437-439 441 458 462 480 482 484 486 539 560-561 572 593-594 649 654 662 664 673 679 687 712 805 814 820-821 1037 1118 1130 1140 1184 1198 1223 1230 1236 1261 1289 1298 1311 1333 1345 1355 1384 1409 1413 1422 1465 1473 1484-1485 1543-1544 1548-1549 1556 1561 1568-1570 1606 1613 1616 1625 1627 1750 1812 2325 2327 2338 2343 2346 2630 2633 3686 3688 3698 3704 3732-3733 3737 4438-4439 4757 5543 5549-5550 5559-5560 5562-5565 5567 5601 5608 5610-5611 5621 5623 5893 5905 5907 5909-5910 5912-5913 5925 5929 5940-5941 5943 5947 5952 5954 5963 5965-5966 5984-5985 5987-5988 5990 5993 5995 5997-5999 6002 6020 6037 6044-6045 6047 6080-6082 6104 6106 6112 6114-6117 6120 6122-6123 6130 6517 6641 6810 7120 6/1-2 7-8 17-18 20-21 46 51 66 80 85 99-100 128 131-132 134 136 160 168 177 185 189-190 213 221-223 233 238-240 245 247 251 257-259 268-269 277 279 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11025-11027 11029-11031 11033 11062 11067 11070 11080-11081 11084 11086 11088 11090 11093 11104 11107 11109 11113-11114 11116 11118 11120 11125 11130 11132 11136 11144 11163 11165 11176 11178 11182 11203 11207-11208 11212-11213 11222 11232 11271-11272 11275-11276 11289 11291-11292 11294 11297-11298 11300-11301 11308 11335 11343 11346 11362-11363 11365-11366 11368-11369 11373 11377 11402 11405-11406 11412 11415-11416 11422 11429 11432 11439 11448-11449 11456 11460 11465 11470 11488-11490 11524 11529 11538 11777 11779-11780 11783 11788 11808 11810 11812-11813 12311 12338 12352 12355 12359-12360 12365 12367 12369-12370 12373 12409 12411 12414 12418 12449 12451 12453 12456-12457 12500 12502 12529 12541 12545 12553 12573 12588 12592 12609 12626 12635 12640 12650 12659 12661 12668 12673 12682 12722 12787 12797 12907 12911 12994-12996 13042 13049 13051 13060 13077 13133 13165 13168 13170 13219 13224 13230 13279-13280 13289 13295 13298 13309 13319 13325 13328-13329 13331-13332 13339 13341 13344 13361 13374 13376 13384 13390 13393 13398-13399 13401 13406 13410 13418 13421-13422 13429 13435 13462 13483 13487 13496 13506 13520-13521 13547 13570 13572 13581 13586 13595 13598-13599 13603 13607 13615 13618-13619 13634 13637 13642 13650-13651 13654-13656 13680 13682 13691 13693 13700 13702 13718 13721-13722 13727 13741-13742 13749 13754-13756 13772 13776-13777 13781 13785 13788 13806 13808 13810 13818 13820 13824 13827-13828 13832 13840 13848 13858 13870 13874 13882 13899 13955 13962 13964 13967-13968 13975-13976 13978 13984 13987 13997 14016 14068 14083 14088 14096 14098-14099 14102 14105 14133 14140 14151 14176 14189 14201 14203-14204 14263 14282 14284 14286 14305 14385 14387-14389 14401 14404 14423 14429 14435 14438 14443 14452 14454 14467 14512 14515-14516 14553 14565 14573 14575 14577-14578 14580 14582-14583 14585-14587 14589-14590 14592 14660 14667 14670 14677-14678 14682 14684 14705 14727 14731-14734 14738 14749-14751 14756-14758 14761 14764 14768-14769 14771-14773 14775 14780-14781 14791 14796 14822 14824-14825 14827-14828 14888 14909 14911 14917-14919 14925-14926 14936 14941 14944 14946-14947 14952-14953 14962-14963 14966 14968-14969 14973-14974 15015 15042 15048 15104 15106 15108 15110 15112-15114 15117-15118 15121-15123 15126-15127 15132-15133 15138-15142 15145 15153 15156 15169-15170 15172 15200 15291 15294 15319 15328 15333 15439 15451 15457 17399 17404 17630 17645 17647 17651 17653 17657 17660-17661 17663 17717-17718 17726 17731 17733 17740 17745 17747-17748 17750-17751 17766 17768 17772 17778 17780 17782 17784 17811-17812 17815 17833 17835-17836 17840 17842-17844 17847-17848 17852 17858-17859 17863 17872-17873 17879 17883-17884 17890 17892 17898 17904 17907 17914 17916 17967 17989-17991 18003-18004 18006 18009 18011-18014 18019 18026 18030 18032 18035 18038-18039 18043 18063 18072 18084-18085 18087-18088 18091 18093-18094 18096 18098-18099 18102 18118-18121 18126 18130 18132-18133 18139 18147 18174 18177 18182 18189 18198 18207 18211 18220 18224-18225 18230 18244 18246 18248 18250 18255-18256 18272 18286 18288 18290 18293 18295 18298 18301 18305-18306 18313-18314 18317 18319 18325 18331 18333 18336 18338 18340-18341 18356 18382-18384 18392 18394-18395 18398 18413 18416 18418 18430 18652 18663 18668 18686 18766 18772 18775 18780 18786 18788 18790-18791 18797-18798 18804 18815 18835-18836 18838-18839 18841 18843 18847 18849 18851-18854 18859 18864-18865 18867 18870 18875 18880 18882 18890 18894 18899 18917 18926 18999 19005 19009 19011 19023 19027 19033-19034 19038 19040-19042 19051-19052 19054 19065 19069 19076 19086 19098 19100-19101 19125-19126 19130 19135-19136 19141-19142 19165 19171 19173 19176 19185 19187 19189 19192-19194 19198-19201 19217 19221 19232 19239 19243 19246 19254 19259-19260 19266 19269 19271 19273 19277 19295 19319 19321 19324 19326 19328 19330-19331 19340 19346 19350 19360 19365 19370 19380-19381 19386 19401 19408 19411 19413 19415 19417 19420 19428 19430 19436 19456 19460-19461 19463 19466-19467 19470 19481 19488 19491 19507-19508 19512 19524-19525 19527 19549 19554 19564 19583 19592 19600 19603 19608 19625 19629 19664 19666 19668 19673 19690 19697 19699 19755 19770 19782 19817 19819 19827 19834 19855 19867 19881 19896-19898 19903 19921 19927 19932 19939 19941 19943 19952 19954 19959-19960 19962-19963 19966 19974 19980 19982 19988-19989 19994 19998 20004 20008 20010 20016 20019 20025 20028 20030 20036 20044 20049 20053 20061 20071 20073 20078 20082 20085-20086 20089 20096 20127 20132-20133 20142 20155-20156 20163 20169-20170 20172 20193 20212 20214 20244 20246-20248 20250 20252 20254-20256 20272-20273 20276 20287 20292-20294 20300 20304 20311 20318 20322 20343 20345-20346 20348-20349 20360 20369 20372 20375 20388 20395 20404 20409 20416 20421 20423 20434 20436 20438-20439 20442 20446-20447 20453-20455 20458 20463 20469 20471-20472 20478 21456 21481 21487 21491 21692 21711 21715 21746 21770 21788 21794 21798 21803 21811 21820 21822 21832 21838 21846 21866 21870 21873 21876 21879 21884-21885 21892-21893 21911 21915 21928 21932 21941 21953-21955 21957 21959 21963 21965 21967 21980 21989 21997 22002 22009-22011 22031 22037 22039 22064 22066 22073 22078 22081 22086 22093 22095 22097 22099-22100 22113 22116-22117 22123 22126 22134 22136-22137 22142-22143 22152 22159 22162 22165 22167 22170-22171 22180 22185 22187 22190-22191 22193-22195 22204-22205 22207-22208 22210 22213 22217-22221 22223 22225 22227-22228 22230 22233 22235 22245-22247 22264-22266 22272 22301 22310-22311 22313 22315 22319 22331 22333 22339 22352 22358 22363 22370 22376 22378-22379 22382 22387 22393 22397 22408 22411 22413-22414 22417 22422-22424 22429-22431 22437-22438 22448 22451-22452 22459 22464 22467-22468 22471 22473 22476 22481-22483 22489 22491 22497 22500 22509-22510 22512-22514 22516-22517 22519-22521 22524 22727 22742 22758 22761 22774 22778 22804 22819-22820 22822-22823 22825-22827 22832 22842-22843 22846 22854 22856 22860 22867-22868 22870 22875-22877 22891-22892 22894-22895 22897 22899-22901 22903-22904 22906 22909 22911 22913-22914 22918 22924 22928 22947 22957 22959 22966 22969-22970 22972 22977 22981 22983-22984 22994 22996-22998 23000-23001 23004 23006-23007 23015 23025 23029 23036-23037 23039 23101 23103 23108 23110 23118 23120-23122 23145 23151 23160 23168 23176 23179 23181-23184 23187-23188 23190 23193-23197 23203 23205 23207-23208 23210-23211 23217 23220 23222-23223 23228-23229 23231 23233-23234 23247 23260 23263 23267-23269 23272 23275 23282 23287 23292-23293 23315-23316 23325 23329 23338-23339 23345 23351 23365 23377 23379 23387 23389 23401-23403 23407 23410 23413 23421 23445 23448 23468 23476-23477 23479 23490 23493 23496-23497 23499 23504 23507 23510 23516 23520 23527 23529 23534-23537 23539 23542 23544-23546 23549 23551 23553-23554 23556-23557 23561-23562 23571 23576 23580 23582 23587 23590 23594 23596 23600 23603 23605-23607 23614-23616 23618-23619 23625-23627 23632-23633 23635 23644-23645 23647 23656-23658 23660 23663-23665 23667-23668 23670-23671 23673 23675 23677-23678 23681 23683 23688-23689 23691 23694 23706 23712-23713 23725 23727 23730 23733 23735 23738 23740 23747-23748 23751-23752 23754-23755 23757-23759 23769-23771 23777-23778 23780 23782-23783 23793-23794 23796-23797 23799 23801 23804 23806-23807 23812-23813 23815 23820 23822-23823 23827 23829 23832-23833 23837 23840-23841 23843-23844 23846-23847 23849-23851 23856-23858 23870 23875-23876 23880-23881 23883-23884 23887-23889 23897-23898 23900 23902-23903 23906-23910 23912 23915-23916 23920-23921 23923-23924 23926 23928-23930 23932 23934-23935 23944-23946 23956 23958 23965-23969 23976 23984-23985 23987 24001 24003-24006 24012 24016-24017 24020 24022-24025 24027 24029 24031-24033 24035-24037 24039 24041-24042 24045-24046 24048 24050-24052 24054-24057 24059-24060 24062-24063 24065 24067 24071-24072 24074-24075 24084 24087 24091 24093 24097 24101-24103 24109 24114 24116 24121 24123-24124 24127 24130-24134 24136 24139 24141 24143 24145-24147 24152 24154-24155 24158-24159 24161-24163 24167-24168 24171 24175 24186-24187 24192 24196 24199 24207 24210-24211 24214 24220 24225 24227 24229-24230 24232 24234-24235 24237-24238 24242-24243 24247 24252-24253 24259-24260 24264 24268 24270 24272 24279 24281-24284 24286-24287 24289-24291 24293 24295 24297 24299 24303 24305 24307-24309 24311 24313-24314 24316-24317 24319 24332-24333 24335 24384 24386-24387 24389 24392-24393 24395-24397 24400 24403-24404 24406-24408 24410-24414 24420 24422 24428-24430 24434-24437 24441-24443 24445-24447 24452-24453 24455 24473 24476-24477 24479 24484-24485 24487 24497-24500 24502-24504 24506 24508 24510-24513 24515 24517-24518 24525-24528 24530-24531 24533 24535-24537 24540-24541 24544-24545 24547 24549-24550 24552 24556-24558 25460 25535 25558 25567 25592 25597 25599 25823 25843-25844 25847 25849 25851 25855 25919 25921 25923-25924 25929 25932-25933 25935-25936 25938 25943-25945 25951 25960 25967 25969 25972 25974 25981 25985 25988-25989 25993 25996 26001 26010 26013-26014 26017 26020 26027 26032 26037 26042 26049-26050 26053 26058 26062 26065-26067 26094 26108-26109 26121 26134 26160-26161 26165-26167 26174 26187-26189 26199 26201 26205 26212 26221 26224 26227 26237 26243 26258 26267 26273 26279-26280 26288 26294-26295 26297 26302 26305 26307 26315 26324 26326 26328 26338 26344 26348 26352 26365-26366 26368 26382 26399 26402 26405 26407 26409-26412 26418 26420 26427 26437 26441 26443 26447 26454 26456 26461 26463-26464 26467-26468 26472 26474 26477 26481-26482 26496-26497 26500-26502 26505 26516 26521 26523 26527 26535 26538 26540 26542 26550-26551 26556 26558 26561 26572 26574 26578 26581 26583-26584 26589 26595-26596 26600 26602 26609 26612 26617-26621 26623 26840 26843 26847 26858-26859 26864 26867 26869-26870 26872 26875 26900 26905 26908 26911 26952-26953 26961 26965 26969 26975-26976 26986 26990-26991 26996-26997 27000 27005 27007 27011-27013 27015 27021-27022 27024 27028 27030 27034 27036 27038 27044 27047 27049 27056 27058 27060 27065-27068 27075 27078 27083 27085 27091-27092 27094-27095 27097 27103 27106 27108 27114 27119 27128 27130-27131 27165 27174-27175 27187 27193-27195 27198 27202 27205 27209 27213 27215-27218 27221 27226 27233 27235-27236 27238 27245 27247 27250 27252 27255-27256 27260 27268-27269 27271 27275 27277-27278 27281 27287-27288 27295 27307 27309 27311-27313 27315 27322-27324 27330-27333 27335 27341 27343-27344 27347 27349-27350 27352 27354 27358-27359 27370-27371 27374 27378 27381 27392-27393 27395-27397 27400 27402 27405 27426 27428-27429 27432-27433 27437-27438 27441 27446-27447 27455 27461 27475 27477-27478 27483 27485 27490-27491 27493 27504 27506-27507 27509-27510 27524 27527-27529 27534 27536-27537 27539-27541 27549 27552 27559-27561 27563 27565 27569 27573-27574 27579-27580 27587 27591 27593-27596 27602 27610 27614 27616 27625-27627 27632 27637 27640 27645 27648 27652 27655 27663 27671 27680-27681 27683 27687 27690-27691 27693-27694 27696 27711 27726 27731 27735-27736 27739 27741-27742 27748 27753 27756 27759-27760 27767 27783-27785 27800 27818 27839 27842 27860 27872 27890-27892 27900 27903 27910 27915 27929 27932 27934-27936 27939 27944 27948-27949 27952 27955-27956 27960 27963 27965 27971 27973 27975-27976 27982 27985-27986 27988-27989 27991 27993 27995 28001-28003 28006 28009-28010 28012 28015 28018 28026-28027 28034 28042 28044 28047 28059 28065 28067-28068 28070 28074 28080 28086 28088 28090-28091 28103 28108-28110 28112 28123 28130 28137 28139 28142 28148-28149 28151 28154-28155 28159 28163 28165 28170 28183 28185 28188 28190 28197 28207 28212-28213 28221 28223-28224 28234 28256 28259 28264 28267 28270 28282 28300-28301 28304 28309-28311 28317 28326-28327 28329 28336-28337 28339-28340 28342-28343 28347 28352 28354 28358 28370 28377 28379 28387 28390-28393 28397 28399-28400 28402-28403 28407 28410-28413 28415 28420 28430 28432 28436 28440 28442 28452 28455 28459 28466 28469 28472 28475 28484-28485 28488 28490 28493-28496 28500-28501 28505-28507 28509 28513-28514 28517 28519 28521-28523 28525-28527 28531-28533 28538 28540 28544 28547 28550 28557-28559 28561-28563 28566 28568-28570 28573 28578-28580 28584 28589 28594-28595 28598 28600-28602 28604 28606-28607 28609 28614-28618 28621 28626 28632 28637-28638 28642 28651 29689 29695 30063 30070 30072 30075 30078 30174 30193 30195 30197 30199 30201 30293 30357 30471 30634 30908 30910 30938 31059 31061-31064 31067 31070 31080 31098 31121 31163 31181-31182 31200 31203 31251 31298 31306 31309-31311 31315-31316 31319 31346 31354 31357 31372 31374-31375 31387-31388 31394 31396-31398 31406-31407 31410 31413 31424 31428 31432 31438 31446-31448 31451-31453 31457-31458 31470 31476 31483 31498 31502 31516-31517 31528 31531-31532 31550 31599 31612 31616-31618 31624 31631 31640 31642-31643 31650-31651 31661 31670 31676 31684 31688 31692 31700-31701 31714 31734-31735 31748 31770 31780 31788 31793 31795 31801 31807 31814 31816 31821 31825 31833 31871 31888 31905 31907 31935 31956 31963 31965 31989 31994 32008 32063 32078 32098-32099 32101 32110 32131-32132 32135-32137 32140 32142-32143 32148 32153 32162 32168 32212 32259 32262 32264 32268 32282-32283 32285-32286 32289 32292 32299 32302 32305 32307 32317 32330 32333 32355 32364-32365 32376 32410 32454 32458 32486 32494 32498 32500 32502 32506-32507 32551 32554-32555 32574 32602 32608 32628 32632 32634 32638 32641 32682 32723 36850 36852 36856 36858-36859 36861-36863 40918 40944 45047-45048 45050 49007 49095 49106 49119 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/268/28?format=ascii Optical default J/ApJS/268/28/table4 Manual verification results of the 6317 white dwarf candidates ObsID [112211/914109128] LAMOST observation ID meta.id;obs long recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST DR9 designation (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char m_LAMOST Number of observations for this target in this table meta.ref.url int nullable RAJ2000 LAMOST Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 [-8.3/86] LAMOST Declination (J2000) deg pos.eq.dec;meta.main gSNR [10/488] g-band spectral signal-to-noise ratio stat.snr;em.opt.B float muSNR [0/180]? {mu}-band spectral signal-to-noise ratio stat.snr double nullable zSNR [0/388]? z-band spectral signal-to-noise ratio stat.snr;em.opt.I double nullable rSNR [0/437]? r-band spectral signal-to-noise ratio stat.snr;em.opt.R double nullable iSNR [0/483]? i-band spectral signal-to-noise ratio stat.snr;em.opt.I double nullable Source Results of cross-validation and identification (G1) meta.bib char Subclass White dwarf subclass (G2) src.class char DR7 Display data from LAMOST LRS DR7 if any meta.ref.url int nullable Info Source also in Table 5 meta.ref.url int nullable
J/ApJS/268/28/table5 Basic information of 4432 white dwarf candidates recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST designation meta.id;meta.main char m_LAMOST Number of observations for this target in this table meta.ref.url int nullable RAJ2000 LAMOST Right Ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 [-7.7/88] LAMOST Declination (J2000) deg pos.eq.dec;meta.main ObsID [108169/911408009] LAMOST observation ID meta.id;obs long gSNR [5/9.99] g-band spectral signal-to-noise ratio stat.snr;em.opt.B float muSNR [0/16]? {mu}-band spectral signal-to-noise ratio stat.snr double nullable zSNR [0/138]? z-band spectral signal-to-noise ratio stat.snr;em.opt.I double nullable rSNR [0/71]? r-band spectral signal-to-noise ratio stat.snr;em.opt.R double nullable iSNR [0/116]? i-band spectral signal-to-noise ratio stat.snr;em.opt.I double nullable Source Results of cross-validation and identification (G1) meta.bib char Subclass White dwarf subclass (G2) src.class char DR7 Display data from LAMOST LRS DR7 if any meta.ref.url int nullable Man Source also in Table 4 meta.ref.url int nullable