J/ApJS/274/36ivo://CDS.VizieR/J/ApJS/274/36doi:10.26093/cds/vizier/bb-8j-14CDSLi W.Zhang L.-Y.Su T.Han X.L.Misra P.Pi Q.2026-08-03T07:25:28Z2025-05-19T08:59:22ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frm-starsvisible-astronomyspectroscopyphotometryline-intensitiesredshiftedmetallicityWe analyze a catalog comprising 781,232 spectra from 641,095 M dwarf stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution spectroscopic data release 9. Based on the equivalent width of the H{alpha} line, we ascertain the activity properties of the stars, identifying a total of 107,134 active stars, with 31175 exhibiting H{alpha} variations. Furthermore, we establish a positive correlation between starspot activity from Transiting Exoplanet Survey Satellite light curves, and chromospheric activity observed through LAMOST spectra on M dwarf stars. Utilizing LAMOST and Gaia data, we map the two-dimensional distribution of active fractions across all M dwarfs in the Milky Way based on H{alpha} and H{beta} lines, confirming a decrease in the active fraction as the distance above the Galactic disk increases. Additionally, we investigate the relationship between chromospheric activity and absolute height above the Galactic disk in various M subtypes. Our findings reveal distinct trends: for M0 to M5 dwarf stars, the active fraction of H{alpha} and H{beta} lines rapidly decreases within the 0-300pc range. In the 300-500pc range, M0 to M4 dwarf stars exhibit a gradual increase, followed by a decrease in the 500-1000 pc range. Conversely, M5 dwarf stars show no significant gradual increase in the 300-500pc range and decrease in the 500-1000pc range. More data will be needed to confirm the phenomenon.2024ApJS..274...36Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/274/36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)V/146 : LAMOST DR1 catalogs (Luo+, 2015)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993)J/A+A/327/1039 : Structure and evolution of low-mass stars (Chabrier+ 1997)J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004)J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)J/other/A+ARV/17.251 : Stars observed with Doppler imaging (Strassmeier, 2009)J/AJ/140/1402 : M dwarf flares from SDSS spectra (Hilton+, 2010)J/AJ/141/166 : HATNet variability survey of K and M dwarfs (Hartman+, 2011)J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)J/ApJ/795/161 : Activity & rotation in Praesepe & the Hyades (Douglas+, 2014)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/MNRAS/476/908 : Chromospheric activity in 4 open clusters (Fang+, 2018)J/ApJS/243/28 : M-type star magnetic activities (Lu+, 2019)J/MNRAS/489/176 : Dynamical heating across the MW disc (Mackereth+, 2019)J/ApJS/244/27 : Radial velocity measurements in LAMOST-II (Wang+, 2019)J/ApJ/890/46 : Superflares on solar-type stars from TESS 1st yr (Tu+, 2020)J/ApJS/247/9 : FGK stars magnetic activity in LAMOST-Kepler (Zhang+, 2020)J/ApJS/253/19 : Halpha and other EWs of LAMOST M-type stars (Zhang+, 2021)J/ApJS/260/45 : Stellar param. of M-type stars from LAMOST DR8 (Ding+, 2022)J/ApJS/261/26 : Exoplanet host stars from LAMOST, TESS, Kepler (Su+, 2022)J/ApJS/268/4 : Stellar var. with TESS 2min cadence phot. (Fetherolf+, 2023)J/A+A/672/A37 : Activity indicators in M dwarfs (Ibanez Bustos+, 2023)J/ApJS/264/17 : Spectroscopic data of TESS objects with LAMOST (Zhang+, 2023)J/ApJS/271/60 : Magnetic activity of G-type stars (Su+, 2024)http://www.lamost.org/dr9 : LAMOST DR9 home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/274/36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/274/36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/274/36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/274/36https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/274/36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/274/36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/274/36/mdwarfs (Stellar parameters of M dwarf stars from LAMOST DR9 spectra (Table 1) and calculation parameters (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/274/36/mdwarfs?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/274/36/mdwarfs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/274/36/mdwarfs?GETtext/xml+votable180.050000true0.000248.348190.0055555555555555562/1 3-5 8 10 19-20 22 24 26 34-35 93-95 109 3/0 2 26-30 36-38 48-49 67-68 71-74 84-86 92 94 101-102 110 112-113 128 130 132 134-135 145-147 150 153-154 161-164 166 168 171 209 212-213 277-278 283-284 286 295 297 299 303-306 309-311 317-319 340 342-343 350-351 357 359 361-363 365 367 369-371 406 413 415 421 423 425-426 428 430 432 435 445-446 504 4/4-5 7 13-15 33-35 37-40 42-43 45-47 96-98 100-101 103 124-125 127 156-158 176-177 179 183 200-202 204-205 209 211-213 216-218 256-258 260-262 265-267 276-277 279-280 282-283 300 302-303 348-349 351 373-375 400-402 412-413 415 432-434 436-437 439 444 446 457-458 464 480 482 516-517 519 524 527 533-535 579 592 594-595 604 606-607 610-611 621 623-624 628 630 633-634 640 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26384-26385 26387 26392 26394-26395 26504-26505 26739 26741-26742 26745-26747 26749 26751 26813-26815 26823 26829-26831 26834-26835 26838-26839 26852-26853 26855-26856 26858-26859 26872 26874-26875 26877 26879 26881 26884-26886 26888 26891 26893 26895 26913-26915 27048 27050-27051 27138-27139 27153-27155 27160-27162 27171 27177 27365 27367 27373-27375 27456-27458 27508-27510 27516-27518 27604-27606 27716 27718-27719 27832 27834-27835 28212-28213 28215 28229-28230 28240-28241 28243 28289-28290 28364-28365 28367 28416-28417 28419 28425-28427 28448-28450 28652 28654-28655 29653 29657 29659 29661 29663 29684-29685 29692-29693 29945 29947 30042 30068 30070-30071 30148-30149 30151 30164-30166 30169-30171 30200-30201 30203 30250-30251 30254 30336-30337 30339 30348-30350 30358-30359 30369 30379 30383 30388 30396 30399-30400 30405 30407 30409 30412-30413 30415 30426-30428 30430-30431 30434 30440 30442-30445 30452-30454 30457 30459 30497-30498 30502 30549 30551 30559 30579 30581 30583 30602 30624 30626 30674-30676 30678-30679 30681 30684 30847 30895 30906-30907 30909-30911 30919 30924-30926 30929-30931 30935 30949 30951 30954-30955 30957-30961 30963-30966 30972 30975 31003 31023 31027 31032 31035-31036 31039 31048 31050-31052 31055-31056 31059 31062-31064 31066 31068-31070 31092-31094 31102 31106 31110 31112-31113 31118-31119 31121 31123 31132-31133 31135 31142-31144 31147 31151 31154 31160 31162-31163 31172-31174 31180 31182-31185 31190 31195 31197 31201-31204 31206-31207 31212 31214 31217 31221 31223 31225 31229 31231 31239 31257 31259 31281 31283 31289 31291 31317-31319 31324-31325 31327 31344 31346 31363 31416 31418-31419 31452-31453 31455 31492 31495 31504-31505 31507 31520 31525-31527 31558-31559 31570 31572-31573 31575 31578-31579 31581-31582 31584 31586-31587 31589-31590 31600 31605 31607 31611 31645 31647 31649-31651 31660-31661 31663 31696-31697 31699 31705-31707 31736-31737 31739 31744 31746 31752 31765-31767 31785-31787 31789 31791 31801-31802 31804-31806 31828 31830-31831 31844-31846 31848 31854 31865 31872-31873 31875 31877-31879 31882-31883 31885-31887 31924 31926-31927 31929-31932 31934-31936 31944 31946-31947 31955 31961 31963 31976 31983-31985 31987 31992 31994 31997 31999-32000 32002-32003 32008 32010-32011 32032 32034 32043 32045-32047 32058-32059 32064 32073-32075 32090 32104-32105 32120 32122 32148 32150 32156 32158-32159 32164-32165 32167 32184-32186 32192 32205 32210 32212 32214 32218 32221 32234-32235 32245 32250-32251 32255 32321-32323 32326-32327 32336 32338-32339 32341-32343 32380 32383 32392-32394 32396 32416 32418-32419 32424 32426 32428-32429 32432-32433 32435 32443 32447 32489-32491 32524-32526 32529-32531 32538-32541 32558-32559 32563 32566-32567 32583-32585 32587 32596-32598 32605-32609 32611 32628 32630-32631 32652 32654-32657 32659 32665 32667 32672-32673 32676 32682-32683 32696-32697 32699 32704-32706 32708-32709 32711 36711 36722-36723 36759 36765 36832-36833 36836 36839 36842-36843 36849-36851 40859 40889-40891 40903 40905 40908 40910 40915 40921 40923 40928 40930-40932 40934-40935 40945-40946 44979 44982 44984 44986-44987 45017-45019 48998-48999 49008 49010-49011 49013-49014 49116-49117 49119 49141https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/274/36?format=asciiOpticaldefaultJ/ApJS/274/36/mdwarfsStellar parameters of M dwarf stars from LAMOST DR9 spectra (Table 1) and calculation parameters (Table 2)zRedshift (G1)src.redshiftcharRo[5.9e-05/13.3]? Rossby numberstat.paramdoublenullableRHa[-0.2/0.002]? Chromospheric H{alpha} activity index, Equation 1spect.indexdoublenullablee_RHa[0/0.01]? Uncertainty in RHastat.errordoublenullableEWHb[-11739/1443099]? H{beta} equivalent width in angstroms0.1nmspect.line.eqWidthdoublenullablee_EWHb[0.005/8383]? Uncertainty in EWHb0.1nmstat.errordoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarH{alpha} variation from LAMOST DR9 LRS data (link to Table 3)meta.ref.urlcharLAMOSTLAMOST DR9 position-based Name (G1)meta.id;meta.maincharprimarym_LAMOSTNumber of observations for this LAMOST sourcemeta.code.multipintnullableRAJ2000LAMOST DR9 Right Ascension (J2000) (G1)degpos.eq.ra;meta.mainindexedDEJ2000LAMOST DR9 Declination (J2000) (G1)degpos.eq.dec;meta.mainindexedSNR[0/822]? LAMOST DR9 spectrum signal-to-noise ratio (G1)stat.snrfloatnullableEWHa[-1499/2682]? LAMOST DR9 H{alpha} equivalent width in angstroms (G1)0.1nmspect.line.eqWidthdoublenullablee_EWHa[0/713467]? Uncertainty in EWHa (G1)0.1nmstat.errordoublenullableSpTSpectral type subclass (G1)src.spTypecharFe/H[-2.5/0.5]? LAMOST DR9 metallicity (G1)phys.abund.Zfloatnullablee_Fe/H[0.08/0.9]? Uncertainty in FeH (G1)stat.error;phys.abund.FefloatnullableTeff[2300/4300]? LAMOST DR9 surface effective temperature (G1)Kphys.temperature.effectivefloatnullablee_Teff[45/424]? Uncertainty in Teff (G1)Kstat.error;phys.temperature.effectivefloatnullablelogg[-0.5/6]? LAMOST DR9 log of surface gravity (G1)log(cm.s**-2)phys.gravityfloatnullablee_logg[0.07/1]? Uncertainty in logg (G1)log(cm.s**-2)stat.errorfloatnullableCV[3.3e-06/2]? Coefficient of variation, this worksrc.var.indexdoublenullablepmRA[-661/814]? Gaia DR3 (Epoch=2016.0) proper motion in RAmas/yrpos.pm;pos.eq.radoublenullablee_pmRA[0.005/2.5]? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-1107/368]? Gaia DR3 (Epoch=2016.0) proper motion in Decmas/yrpos.pm;pos.eq.decdoublenullablee_pmDE[0.007/3]? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableMarkActivity indicator, Yes=Star is activemeta.codecharRad[2/22]? Star galactic radius, projected onto the midplanekpcmeta.idfloatnullableZ[-17.4/32.1]? Stellar galactic scale heightkpcinstr.scale;pos.galacticdoublenullablePer[0.01/437]? Period, based on VSX and TESSdtime.periodfloatnullableMstar[0.1/2.3]? Mass from TESS Input Catalog v8.0solMassphys.massfloatnullableJ/ApJS/274/36/table3H{alpha} variation of M dwarf stars from LAMOST Low-resolution spectral DR9recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTLAMOST position-based namemeta.id;meta.maincharRAdegRight Ascensiondegpos.eq.ra;meta.mainDEdeg[-9.2/78] Declinationdegpos.eq.dec;meta.mainMJD[55858/59377] Modified Julian datedtime.epochintindexeddMJD[0/3422] Difference, maximum and minimum Julian datesdtime;arith.diffintEWHa[-266/2682]? Equivalent width, H{alpha}0.1nmspect.line.eqWidthdoublenullablee_EWHa[0/209401]? Uncertainty in EWHa0.1nmstat.errordoublenullabledHa[0/10046]? Difference, maximum and minimum EWHa0.1nmspect.line.widthdoublenullableRHa[-34057/71930]? Ratio, max/min H{alpha}spect.line.intensity;arith.ratiodoublenullableMarkAssessment of stellar activity based on the H{alpha} spectral linemeta.codechar