MK spectral types of MaStar stars using NutMaat J/AJ/170/222 ivo://CDS.VizieR/J/AJ/170/222 CDS El-Kholy R.I. Hayman Z.M. 2026-07-23T14:05:59Z 2026-07-21T15:46:23Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr morgan-keenan-classification astronomical-models infrared-photometry visible-astronomy broad-band-photometry surveys galaxies spectroscopy sloan-photometry Stellar spectral classification according to the Morgan-Keenan (MK) system remains fundamental to astrophysical studies, yet modern surveys require automated, scalable tools. We present NutMaat, an open-source Python-based package inspired by MKCLASS, designed to automate MK classification while addressing scalability and usability limitations. It employs modern computational tools for batch processing and offers a modular architecture that enables efficient, platform-independent analysis of large spectral data sets. It also includes modules for detecting classical chemically peculiar stars, such as Am, Ap, and {lambda} Boo types, using internal consistency checks between different line diagnostics. Tested on the CFLIB and MILES libraries, NutMaat achieved spectral and luminosity classification accuracies comparable to MKCLASS, with minimal systematic offsets and a robust performance down to a signal-to-noise ratio <=10. NutMaat successfully identified chemically peculiar stars, tested on LAMOST DR7 ACV variables, and processed the SDSS-IV MaStar library-which lacks native MK classifications-to produce a stellar catalog, demonstrating survey readiness. Future development of NutMaat will focus on extending wavelength coverage beyond the 3800-5600{AA} range, computational acceleration via Cython, and refining peculiarity classification. Beyond its technical design, NutMaat can provide consistent, MK-standard classification across large-scale spectroscopic surveys, facilitating reliable stellar population analyses, identification of rare objects, and the construction of high-quality spectral catalogs essential for galactic archaeology and stellar evolution studies. As an open-source tool, NutMaat bridges traditional MK methods with modern data workflows, offering a scalable solution for current and future spectroscopic surveys. 2025AJ....170..222E https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/222 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017) III/183 : Atlas of 837.5-877nm spectral region I. (Andrillat+ 1995) III/217 : Atlas of 840-880nm spectral region (Andrillat+ 1995-1997) III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022) V/154 : Sloan Digital Sky Surveys (SDSS) DR16 (Ahumada+, 2020) V/156 : LAMOST DR7 catalogs (Luo+, 2019) V/162 : LAMOST DR11 catalogs (Luo+, 2026) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) J/ApJS/107/281 : Atlas of hot, luminous stars at 2 microns (Hanson+ 1996) J/ApJ/508/397 : H-band Spectral Standards (Meyer+ 1998) J/ApJ/535/325 : Spectra of normal stars in the J-band (Wallace+ 2000) J/AJ/121/2148 : Precise spectral types for 372 A, F & G stars (Gray+, 2001) J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003) J/ApJS/152/251 : Indo-US library of coude feed stellar spectra (Valdes+, 2004) J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006) J/AJ/137/3245 : STARMIND MK standard's database (Manteiga+, 2009) J/ApJS/230/16 : O5 to L3 empirical stellar spectra from SDSS (Kesseli+, 2017) J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017) J/ApJ/883/175 : 1st release of MaNGA Stellar Library (MaStar) (Yan+, 2019) J/A+A/656/A125 : ACV variables in Zwicky Transient Facility (Faltova+, 2021) J/ApJ/899/62 : Stellar parameters from 1st release of MaSTar (Chen+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/222 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/222 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/222 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/222 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/222 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/222 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/170/222/table4 (MaStar library classification catalog using NutMaat) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/222/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/222/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/222/table4? 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18118-18119 18121 18124 18126-18127 18141 18143 18145 18148-18149 18151 18156 18165 18169 18171 18178-18179 18222-18223 18295 18299-18301 18303 18308-18309 18312 18314-18315 18320 18322 18328 18330-18331 18336-18338 18343 18349 18351 18353-18355 18364-18365 18367 18381-18385 18387 18396 18402-18403 18412-18414 18416 18418 18433-18435 18440-18441 18443 18452 18454 18462 18464-18465 18467 18475 18484-18486 18489 18491 18530-18531 18536-18537 18539-18540 18542 18560-18562 18566-18567 18570-18573 18575 18578 18581-18583 18593 18596 18603 18616 18618 18620-18621 18623 18634 18640-18641 18643 18646 18648 18652 18654 18664 18666 18668-18669 18672 18674 18685-18687 18690-18691 18697 18704-18706 18708 18710-18712 18715 18717-18719 18728-18729 18733 18735 18744 18746 18748-18749 18758 18768 18771 18774 18776-18778 18780 18782 18788-18789 18791 18793 18796 18798-18801 18820-18821 18823 18830-18831 18841 18844-18846 18849-18850 18852 18854-18855 18866 18885 18956 18958 19005 19021 19023 19025 19032-19033 19035 19037-19038 19042-19043 19046 19049-19052 19054 19056-19057 19085-19087 19089-19091 19094 19100 19102 19104 19106-19107 19112-19113 19115-19118 19120-19122 19182 19201-19202 19319 19324-19325 19327 19373 19379 19384 19386-19387 19399 19402 19404 19407 19410 19413 19416 19418-19419 19425-19427 19429 19432-19433 19456-19457 19460-19461 19537 19540 19662-19663 19668-19669 19671 19676-19677 19681 19683 19685-19687 19691 19696-19698 19700 19727-19729 19731 19733-19734 19736-19738 19740-19742 19747 19752-19753 19755 19758-19762 19768 19776 19780 19840-19842 19848 19981-19983 19985-19987 19990 19996-19998 20000-20002 20014 20016-20018 20096-20097 20158 20549 20551 20557 20560-20561 21359 21370-21371 21373 21375 21379-21380 21382-21385 21406 21424 21426-21428 21430 21445 21447 21461-21462 21464 21482 21486 21841 21844-21845 21847 21850-21851 21857-21860 21862-21865 21867 21884-21885 21887 21973 21995 21998-21999 22013 22015 22029 22031 22034 22044 22046 22056 22058-22059 22064-22065 22068-22069 22071 22073 22075 22111 22118 22124 22133 22164-22165 22208 22244 22246-22247 22258 22270-22271 22279-22280 22282-22283 22285-22287 22290-22291 22300 22302 22304-22305 22308 22321 22337 22339 22348-22349 22352 22354 22391 22396-22398 22442 22485 22717 22719 22762 22783 22801 22804-22805 22807 22814-22815 22837-22839 22845 22870 22876 22878-22879 22888-22889 22958 22980-22981 22983 22992-22993 22995-22996 23043 23046-23047 23052-23054 23056-23057 23059-23062 23064-23065 23072 23074-23076 23080 23101-23104 23144 23146 23181-23183 23185-23187 23201 23203 23213-23214 23216-23218 23232-23234 23300 23325 23327 23362 23377 23379 23385 23388-23390 23392-23393 23422-23423 23459 23463 23474-23475 23514-23515 23517-23519 23522-23523 23526 23532 23534 23536-23537 23539 23545-23547 23601-23604 23606-23609 23611-23614 23687 23693 23695 23697-23699 23702 23708 23717 23719 23725-23727 23816-23817 23998-23999 24019 24022 24025-24026 24028-24029 24032-24033 24035-24037 24042 24066 24069 24080-24081 24103 24105-24107 24114-24115 24118 24124 24126 24149 24151 24156-24157 24159 24192-24194 24200 24202-24203 24210 24216 24218 24222-24223 24229-24231 24236-24238 24248-24249 24251 24266 24269 24274 24280 24282 24293 24304-24305 24322-24323 24328-24330 24338-24339 24348 24350 24487 24500 24502 24508 25329 25331 25337 25340-25341 25506 25533 25570-25571 25580 25582 25586-25587 25596 25598 25602-25603 25612 25614-25615 25617 25619 25632-25633 25641-25643 25656-25657 25659 25667 25670 25672 25674-25675 25682-25683 25686-25687 25689-25691 25704 25706 25709 25711-25712 25714 25716 25726 25729 25731-25734 25745 25748-25749 25846-25847 25849 25853-25855 25861 25863 25876 25878 25880-25881 25884 25944-25945 25947-25950 25971 25980-25981 25983 25998 26017-26019 26024-26026 26028-26029 26035 26038 26068-26069 26164 26166-26167 26172 26174-26175 26196-26197 26201 26203 26228-26229 26260 26262-26263 26265 26267-26268 26270 26274 26278 26284 26286 26303 26346 26388-26389 26493 26542-26543 26877-26879 26905-26908 26910-26911 26922-26923 26928-26929 26944-26945 26961 26963 26966-26967 26969 26971 26993 26996-26997 27012 27014-27017 27020 27036-27037 27039 27052-27053 27055 27059-27061 27063 27065-27069 27071 27074 27080 27082 27084 27087 27096 27099 27104 27106 27108 27112 27114 27120-27121 27133 27199 27213-27215 27217 27219 27228 27233-27235 27240-27242 27244-27245 27248 27250-27251 27254 27261-27263 27274-27275 27278 27285-27287 27289-27291 27300 27302-27303 27305-27307 27313-27315 27320-27322 27324-27325 27327 27332-27333 27335 27340-27342 27344-27346 27349-27354 27356-27358 27360-27362 27364-27366 27368 27370-27371 27376-27378 27396-27398 27400-27401 27404 27407-27410 27412-27413 27415 27417-27418 27420 27422-27423 27427 27429-27431 27436-27437 27439 27445 27456 27479 27481 27483 27508-27509 27521-27523 27581 27629 27632 27634 27638 27644 27646-27647 27649 27652 27660 27662 27668-27669 27671 27680 27698 27781 27792 27814 27820 27822 27830-27831 27880 27882 27902-27903 27905 27907 27913 27915 27922 27928 27937 27939 28030 28067 28076 28078 28145 28147 28157 28161 28164 28168 28170 28180-28181 28192 28209 28220-28221 28241 28243 28252-28253 28256 28258 28264 28270-28271 28281-28283 28286 28318-28319 28340-28341 28343 28358-28359 28361-28366 28372 28384 28420 28424-28425 28427-28428 28430-28431 28449 28452 28526-28527 28531 28533-28538 28540 28542-28543 28545-28548 28550-28551 28556 28599 28612 28619 28622 28624 28627 28633 28635-28638 28644 28646 28648-28649 28858 28929 28956-28957 28964-28965 28967 28980 28982 28984-28985 28988 28996 28998-28999 29001 29008 29013 29015 29018 29021 29025 29027 29040 29042-29043 29048-29049 29121 29124 29196-29197 29199 29205 29207 29217 29219 29226 29232-29234 29244-29246 29248-29249 29251 29262-29263 29284 29286-29288 29298 29304-29306 29321 29336 29344 29346-29347 29352-29353 29355-29358 29360 29362 29381 29548 29550 29632-29633 29635-29638 29649 29651 29657 29660-29661 29663 29700 29835 29864-29865 29868-29870 29901 29916 29918 29934-29937 29946 30029 30031-30034 30044-30046 30064 30260 30262-30263 30265 30268-30269 30271 30284-30285 30288 30290-30291 30293 30295-30297 30301 30307 30310 30316 30318 30336 30338 30344 30346 30389 30391 30397 30401 30404 30410 30436 30438 30440-30441 30444 30472-30473 30578 30660-30661 30672 30720-30721 31118 31136-31137 31404-31405 31407-31408 31410-31411 31416-31418 31445-31447 31452-31453 31455 31467 31470 31485 31487 31577-31579 31581-31583 31601 31603 31616 31618-31619 31649-31651 31654-31655 31660-31662 31695 31706 31716-31717 31719 31728 31730 31769 31771 31796-31797 31816 31818 31840 32029 32031 32053 32078 32096-32098 32399 32403 32421 32423 32428-32429 32431-32433 32437-32439 32479 32486 32492-32494 32497 32499-32502 32508-32509 32511 32672 32674 32684 36515 36518-36519 36536 36538 36649 36651 36654-36655 36703 36717 36719 36721-36723 36725-36729 36731-36733 36737 36739 36759 36800 36802-36803 36812 36816 36861-36863 39879 39885 39887 39896-39898 39900 40515 40518 40521 40523 40545 40548 40949 40951 40956 40958 42846-42847 42861-42863 42865 42867 42872 42874 42876 42879 42907-42908 42910 42929 42931 42933-42935 42939 42941-42943 42948-42950 42960 42964 42966 42973-42975 42978-42979 42983 42989-42991 42993-42995 42997-43000 43002-43005 43007 44316-44317 44319 44341 44353-44355 44365 44367 44370-44371 44384-44385 44387 44393 44396-44397 44400-44401 44717 44719 44722-44723 44732-44733 44768 44770-44771 44774 44780 44782 44957 44959 44981 44983 44986-44987 45055 47982 48014-48015 48022-48023 48037 48039 48043 48045-48047 48052-48053 48060 48062 48065-48068 48070-48074 48076 48083 48086 48088-48089 48091 48106-48107 48109-48111 48113-48116 48127 48509 48511 48596-48597 48599 48810 48988-48989 48991 49006-49007 49018-49019 49077-49079 49095-49097 49099 49128 49130 49149-49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/170/222?format=ascii Optical Infrared default J/AJ/170/222/table4 MaStar library classification catalog using NutMaat recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Sp Display the online SDSS DR17 spectrum from the Science Archive Server (SAS) meta.ref.url char MaNGAId ID of spectrum in the MaNGA Survey meta.id;meta.main char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed SNR [3/1024] Signal-to-noise ratio stat.snr int SpType Spectral type predicted by NutMaat src.spType char Qual Match quality flag estimated by NutMaat (1) meta.code.qual;meta.modelled char chi2 [7.29e-5/1380]? Chi-squared of match to standard spectrum (2) stat.fit.chi2 double nullable AP-2 Link to APOGEE-2 DR17 allStar catalog (III/286) data for sources within 1" meta.ref.url int nullable SDSS Link to SDSS DR16 catalog (V/154/sdss16) data for sources within 0.01" meta.ref.url int nullable MaStar Link to MaStar 1st release catalog (J/ApJ/883/175) data meta.number int nullable MaNGA Link to MaNGA DR15 catalog (J/AJ/154/86) data meta.number int nullable SimbadName Simbad column added by the CDS meta.id char nullable