Magnetic activity of M dwarfs from LAMOST DR10 J/A+A/704/A274 ivo://CDS.VizieR/J/A+A/704/A274 CDS Li W. Zhang L. Su T. Wang Y. Han X.L. Misra P. 2026-03-02T06:25:50Z 2025-12-19T09:36:06Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr m-stars stellar-flares visible-astronomy M dwarf stars (red dwarfs), the most common stars in the Milky Way (70 percent of all stars), have low temperatures and masses but exhibit strong magnetic activity, such as flares, starspots, and coronal mass ejection (CME). Studying their magnetic activity helps understand the internal structure and evolutionary processes of stars, as well as their impact on the environments of surrounding planets. This study uses medium-resolution spectral (MRS) data of M dwarf stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 10 (DR) to conduct a comprehensive and in-depth investigation of stellar magnetic activity, flare, and starspot variations. By cross-matching the low-resolution spectral (LRS) M dwarf star catalog from LAMOST DR10 MRS data, we have successfully identified 20279 M dwarfs and obtained a total of 708969 medium-resolution spectral datasets. These data provide a rich foundation for studying stellar magnetic fields and activity characteristics. Additionally, we cross-matched the data with light curves from the Transiting Exoplanet Survey Satellite (TESS), acquiring light curve data for 2868 stars, among which 891 flare stars were identified, providing important samples for the statistical characteristics and physical mechanisms of flare events. By combining with Gaia data, we clarified the spatial distribution characteristics of M dwarfs in the Milky Way. In statistical studies of M dwarf stars magnetic activity using LAMOST medium- resolution spectra, it has been found that as the effective temperature of M dwarf stars increases, their stellar activity diminishes, though this trend becomes less evident for Teff>3600K, and the amplitude of Halpha line variations becomes more dramatic for later spectral types. In a sample of 11868 M dwarfs with a signal-to-noise ratio exceeding 10, we found that 1676 exhibited Halpha emission features, i.e., were active stars. Also, among the 891 flare stars identified from TESS light curve data, 7496 flare events were detected. Among the 119 stars with EW Halpha flare-like variations, 25 were flare stars in TESS light curve data. Research has also clarified that the activity of M dwarf stars in the Milky Way decreases with increasing vertical distance from the galactic disk. Furthermore, by combining LAMOST spectral surveys with TESS light curve data, a positive correlation between chromospheric activity, as indicated by Halpha lines, and star spot area has been established.Additionally, studies show a positive correlation between flare energy and duration in M dwarf stars, with the slope of this correlation decreasing for later spectral types. Finally, through analyzing the asymmetry of Halpha lines, two potential CME candidates have been identified. 2025A&A...704A.274L https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/704/A274 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/ApJ/849/36 : Flaring activity of M dwarfs in the Kepler field (Yang+, 2017) J/A+A/637/A22 : M dwarfs rotation-activity relations and flares (Raetz+, 2020) J/ApJ/905/107 : Spectroscopic activity indicators of TIC stars (Medina+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/704/A274 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/704/A274 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/704/A274 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/704/A274 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/704/A274 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/704/A274 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/704/A274/table1 (Stellar parameters of M dwarf stars from LAMOST DR10) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/704/A274/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/704/A274/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/704/A274/table1? 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10738 10744 10746 10752 10754 10756-10758 10766-10768 10771 10773-10778 10785-10788 10791-10794 10796-10797 10799 10837-10838 10841 10843 10848-10850 10855-10856 10858-10859 10862-10866 10868 10870 10872 10875-10876 10878 10908 10910 10917-10920 10929-10932 10949-10951 10953 10957 10959 10964-10965 10969-10972 10974-10975 10977-10979 10985 10996-10998 11000 11002-11003 11006-11007 11009-11010 11012-11013 11015-11016 11018 11020-11021 11028-11029 11031 11054-11055 11057-11059 11061-11064 11066-11067 11069-11072 11074-11075 11077-11079 11088 11090 11098 11112 11114-11115 11117-11118 11120-11121 11123 11128 11141 11143 11151 11161 11163 11165-11167 11171 11177-11182 11192 11200-11201 11203 11208 11210 11232 11240 11242-11246 11256 11258 11280-11281 11283 11285-11287 11293 11317 11327 11344-11346 11348 11350 11352 11354 11376 11378-11379 11384 11407 11411 11436-11437 11444-11445 11447-11449 11460 11462-11463 11468 11470 12292 12309 12355 12357 12361 12364 12376 12589 12602 12621 12634 12641 12646 12648 12655-12656 12658-12659 12664 12666-12667 12675 12688 12690-12691 12697-12700 12709 12724 12740-12741 12746 12765 12771 12774 12781 12796 13077 13106 13219 13250 13330-13331 13336 13343 13353 13357-13358 13361 13371 13381-13383 13389-13390 13393 13398 13410 13418 13439-13440 13444 13450 13453-13454 13457-13459 13463-13464 13467-13469 13471 13475 13488-13489 13492 13505-13508 13513 13550 13569 13573 13575-13576 13578-13579 13581-13584 13587 13589 13595-13596 13598 13601-13605 13609 13611-13612 13620 13639 13648-13649 13652-13654 13656-13657 13660 13668 13713 13762 13791 13815 13823 13833 13838 13845 13847 13852 13854-13855 13857 13863 13865 13868-13869 13872 13896 13898-13899 13981 14133 14146 14167 14174 14575 14584 14586 14671 14694 14759 14780 14783 14818-14819 14826 14830 14887 14916-14917 14919 14921 14924 14926 14929 14935 14938-14939 14951 14953 14956-14958 14962-14964 14968-14970 14990 15008 15013 15022 15082 15084-15085 15104 15107-15108 15111 15113 15121-15122 15127-15130 15137 15152-15153 15170 15176-15178 15246-15247 15256-15257 15263 15280-15282 15294 15338 15343 17374 17396 17769-17771 17775 17813 17815 17860 17862-17864 17866-17867 17870 17874 17911 17915 17918 18006-18007 18011 18013-18015 18029 18032 18034-18035 18083 18086-18087 18090-18091 18098 18128-18129 18131 18137 18139-18141 18143 18160-18161 18163 18169 18178 18190 18212 18214 18216-18218 18260 18268 18330 18348 18350-18351 18359-18362 18410-18411 18767 18778-18779 18801 18901 18911 18933 18935 18943 19035 19045 19047 19053 19055 19116 19118 19135 19143 19149 19152-19154 19156-19158 19163 19166 19173 19175 19179 19182 19234 19238 19258 19313 19317-19318 19325-19327 19336-19337 19340-19342 19344 19346 19352 19412-19413 19430 19433 19436 19439 19442-19443 19451 19456-19457 19459 19465 19467 19472-19474 19480 19482-19483 19489-19491 19497 19500-19501 19503 19509 19511-19514 19553-19554 19559-19560 19564 19566 19578 19589 19594-19595 19600 19602-19603 19605 19608 19624-19625 19629-19630 19635 19648 19650 19653 19657 19661-19663 19666 19672 19676 19684 19728 19741 19743 19782-19783 19788-19789 19797 19799-19801 19814 19871 19889 19894-19895 19897-19900 19902-19903 19936 19938-19939 19945-19947 19950 20000 20002-20003 20012 20089-20090 20096-20097 20140 20142-20143 20167 20176-20177 20184-20185 20187-20190 20197 20206-20208 20210-20213 20215 20220 20223 20245-20247 20253 20255 20287 20290-20291 20293-20295 20297-20301 20320 20323 20326 20329 20332-20333 20340-20342 20371-20372 20374-20376 20378 20380 20382 20384 20392 20394-20396 20408-20409 20411 20426-20427 20429-20431 20436-20438 20449-20451 20453 20456 20458 20468 20470-20472 20474 20476 21368 21370-21371 21374 21434-21435 21438-21439 21445-21447 21452-21453 21455 21457-21460 21462 21464 21468 21479-21481 21485-21487 21493 21497-21498 21791 21807 21813-21814 21817 21819-21822 21831 21834 21837 21862-21865 21867 21882 21895 21907 21912-21913 21916-21917 21953-21954 21956 21959 21964-21965 21969-21973 21976 21980 22007 22009 22011 22029 22031 22043 22046 22052 22060 22064 22069-22070 22073 22075 22077-22078 22087-22088 22091-22093 22099 22102 22104-22105 22107-22108 22117 22119 22123 22128-22129 22133 22161 22164 22175 22178 22186-22187 22195 22199 22206 22211 22218 22222 22233 22236-22237 22239-22240 22243-22245 22249 22258 22262 22264 22270 22310-22311 22316 22318-22319 22322 22334 22353 22355 22358 22364 22366-22367 22381 22385 22387 22389-22391 22393-22395 22400-22401 22405 22407 22410 22424 22426 22449 22452-22453 22464 22466-22468 22470 22472-22474 22476 22478 22489 22491 22496 22771 22774-22775 22809 22811-22814 22836 22844 22853-22857 22859-22861 22863-22866 22868-22870 22873 22882-22885 22894-22896 22901 22903 22906-22907 22909 22952 22954-22955 22977 22979 22985 22992-22993 22995-22996 22998 23004 23006 23029-23031 23037 23110-23112 23114-23115 23117-23119 23129-23130 23133 23136 23139-23140 23142-23143 23296-23298 23304 23323 23326 23340-23341 23343 23345-23348 23350-23351 23400 23418 23444-23445 23455 23459 23463 23465 23467 23471 23479 23485 23504 23506-23507 23509-23511 23536 23538-23540 23542-23543 23552-23554 23562 23566 23569 23584-23585 23587 23590 23596 23598 23637 23646 23663 23674 23685 23689 23712 23715 23722 23726 23737-23740 23742-23743 23748 23751 23758 23760 23762 23764 23769 23771 23773-23775 23779 23783-23784 23787 23792 23794 23810 23862-23863 23867 23869-23870 23875 23877 23879 23881 23885-23887 23890 23897-23898 23900 23905 23908 23910 23913 23915-23916 23918-23919 23924 23926-23927 23941-23943 23945 23947 23960-23961 23964 23966 23969 23972-23973 23975 23981-23983 23988 23990-23991 24020 24022-24026 24028 24032-24034 24040-24041 24043 24048 24050 24052 24054-24058 24060 24062-24063 24077 24084 24086 24088-24089 24091-24093 24107 24128 24130-24131 24192-24194 24196 24198-24199 24206 24222 24228-24230 24242-24243 24267 24285 24287-24288 24290-24292 24294 24300-24301 24303 24307-24308 24310-24311 24313 24318-24319 24323-24324 24326-24327 24332-24333 24344-24346 24348-24349 24351 24379 24384-24386 24392-24393 24395-24397 24399-24401 24403 24409 24411-24413 24420-24421 24431 24437 24444 24446 24453 24458-24459 24464-24465 24467 24469 24472 24474 24476 24478 24481 24483 24485-24487 24490-24491 24493-24495 24507 24510 24528 24531 24534-24535 24537 24539 24541-24542 24554-24557 24561 24563 24565 24570 24572-24573 25715 25719-25720 25724 25808 25813-25814 25822 25846-25847 25991-25992 25996 25998-25999 26002 26006-26007 26011 26013-26015 26025-26026 26032 26034 26037-26038 26040 26042 26077 26079 26097 26100-26101 26103 26109 26111 26157 26161 26172-26174 26190-26191 26208-26209 26211 26219 26225-26227 26233-26235 26238 26262 26268 26270-26271 26278-26282 26284-26286 26296-26297 26299 26305 26307 26310 26313-26314 26316-26318 26326 26336-26338 26340-26341 26352 26355 26357 26359 26364 26368 26370 26373 26376 26378-26379 26385 26392 26408 26414 26416 26418 26424 26475 26478-26479 26530 26561-26562 26564-26566 26568-26569 26572 26574-26575 26577-26579 26582 26584-26585 26587-26588 26597-26598 26600 26607 26611 26614-26615 26619 26621-26623 26975 26979 26983 26994 27004 27006-27007 27072-27073 27075 27083-27085 27087 27092-27093 27095-27097 27100-27102 27110-27111 27117 27119-27120 27123 27125-27126 27132-27134 27143 27147 27150-27151 27154 27160-27162 27180-27181 27183-27184 27186-27187 27192-27193 27196 27198 27241 27243 27245 27249 27251 27255-27256 27259 27261 27263 27266 27269 27271-27273 27275 27277 27280-27281 27284-27285 27296 27299-27302 27305 27308 27311 27328-27329 27331-27334 27336-27337 27344 27347 27349-27350 27354 27358 27365 27367 27376-27377 27379-27381 27383-27385 27388-27390 27405 27407 27409-27412 27414-27416 27418-27419 27426-27427 27430-27431 27437-27439 27449-27450 27452-27453 27455-27456 27477 27488-27490 27508-27510 27516 27520-27522 27524-27525 27527 27536 27538 27540 27550-27552 27555-27556 27559-27562 27564-27565 27571-27573 27575 27579-27580 27583-27585 27588-27590 27594 27596-27597 27600-27601 27603 27605-27606 27608-27609 27616-27618 27624 27627-27629 27641 27643 27645-27647 27649 27651 27658-27659 27661 27664-27666 27668-27669 27671 27681 27683 27687-27688 27691 27694 27696 27712 27757-27759 27765 27768 27770-27771 27778-27779 27782 27784 27786-27787 27789 27791 27807-27808 27810-27811 27813-27815 27820 27822-27826 27829 27841 27843-27845 27847 27852-27853 27855-27858 27860 27862-27865 27868-27869 27871 27873-27875 27880-27881 27884 27888 27890 27912 27915 27917 27930 27932-27934 27936-27937 27939-27940 27942-27943 27947 27949-27950 27952 27954 27970-27971 27974-27975 27996-27997 28009 28011 28025-28028 28030-28031 28034-28036 28038 28040-28041 28043-28044 28046-28047 28054 28056 28058 28064-28065 28079 28092-28093 28095 28100 28102-28103 28105 28107-28108 28110-28111 28118-28119 28129 28132-28134 28153-28158 28160-28161 28164 28187 28192 28194 28198 28200-28201 28203 28205-28206 28212-28213 28216-28217 28221-28223 28234-28235 28240-28241 28244 28249-28250 28255-28257 28259 28264 28272-28273 28277-28278 28292-28293 28304-28306 28308 28310 28319 28339 28341 28343-28344 28346-28348 28350-28351 28355-28356 28358-28359 28364-28365 28367-28368 28370 28376 28378-28379 28383 28389 28391 28396-28398 28400-28402 28408 28410-28414 28426 28441-28443 28464-28465 28467 28476-28477 28496 28498-28499 28520-28522 28540 28542-28543 28545-28547 28549-28551 28553-28555 28557-28559 28561-28563 28566-28567 28569-28570 28572-28574 28576-28577 28579 28597-28599 28605 28607 28612-28613 28615 28618-28619 28626-28627 28629-28633 28640 28642-28643 28654-28656 28658-28659 28661-28664 28666 28668 30847 30911 30958 31081-31082 31085 31169 31177 31229 31403 31406-31407 31419 31422 31479 31483 31486 31573 31575 31651 31654 31658-31659 31661 31683 31687 31689 31692 31694-31695 31707 31713 31715 31728-31730 31742 31778 31789 31791 31800 31863 31912-31913 31915-31916 31918-31919 31927 31931 31935 32189 32257-32259 32262 32275-32276 32278 32282 32284 32292 32294 32304 32321-32323 32326-32327 32329 32332 32345-32346 32350 32369 32374-32375 32380 32436 32443 32456 32473-32474 32476-32477 32480 32485 32487 32496 32500 32502 32504-32505 32507 32511 32514 32526 32538 32541 32546-32547 32550-32551 32556-32557 32562 32569 32573 32575-32576 32578-32579 32590-32591 32600 32602-32603 32609-32612 32614-32616 32619-32621 32624-32626 32633-32634 32641-32642 32644-32646 32648 32650 32652 32655-32657 32659-32660 32665 32667-32668 32671 32673 32676 32682-32683 32689 32691 32693-32694 32698 32705 32737-32741 32743-32744 32747 32749 32753 32756-32757 32763 32765 40925-40926 40953 40955 44987-44988 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/704/A274?format=ascii Optical default J/A+A/704/A274/table1 Stellar parameters of M dwarf stars from LAMOST DR10 recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Teff ? Effective temperature in low resolution K phys.temperature.effective double nullable e_Teff ? Effective temperature error K stat.error;phys.temperature.effective float nullable logg ? Surface gravity in low resolution log(cm.s**-2) pos.angResolution float nullable LAMOST LAMOST Name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char primary RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed medLMJD Local modified Julian day in medium resolution time.epoch int medBand [BR] B and R band spectra in medium resolution instr.bandpass char medSNR Signal to noise ratio in medium resolution stat.snr float lowSubclass Spectral types in low resolution src.class char e_logg ? Surface gravity error log(cm.s**-2) stat.error float nullable Gmag ? Gaia G-band magnitude mag phot.mag;em.opt float nullable Bp-Rp ? G_BP_-G_RP_ colour mag phot.color;em.opt.B;em.opt.R float nullable [Fe/H] ? Metallicity, [Fe/H] phys.abund.Z float nullable more indicates data in tables 2 and/or 3 meta.ref.url char
J/A+A/704/A274/table2 The stellar parameters of M dwarf stars obtained through calculation and cross-matching recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char EWHa H{alpha} equivalent width calculated from the dispersion spectrum 0.1nm spect.line.eqWidth float e_EWHa EWHa error 0.1nm stat.error double MA [Yes No] Stellar activity classification meta.code char Per ? Stellar rotation period d time.period float nullable Ro ? Rossby number stat.param float nullable RHa ? Chromospheric activity index spect.index double nullable tao ? Stellar convective turnover time d time.epoch double nullable Mass ? Stellar mass solMass phys.mass float nullable R ? Distance R from the point where the star's spatial position is projected onto the Galactic plane to the Galactic center kpc pos.distance;pos.galactocentric double nullable Z ? Distance perpendicular to the Galactic plane kpc pos.distance;pos.galactic float nullable Rad ? Stellar radius solRad phys.size.radius float nullable EWHabol ? EWHa energy value of flare-like variable stars phys.energy double nullable
J/A+A/704/A274/table3 Stellar flare parameters of M dwarf stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char PeakTime ? Flare peak time of stellar flare events (BJD-2450000) d time.epoch double nullable BeginTime ? Flare onset time of stellar flare events (BJD-2450000) d time.epoch double nullable EndTime ? Flare decay time of stellar flare events (BJD-2450000) d time.epoch double nullable Duration ? Stellar flare duration min time.duration double nullable Amplitude ? Stellar flare amplitude mag src.var.amplitude double nullable Ebol ? Flare energy of M dwarf stars 1e-07J phys.energy double nullable Reff ? Stellar starspot area phys.area float nullable