K stars abundance and activity from LAMOST DR10 J/ApJS/281/5 ivo://CDS.VizieR/J/ApJS/281/5 CDS Zhang Z. Zhang L.-Y. Su T. Han X.L. Misra P. Pi Q. Lu H. 2026-08-27T07:02:36Z 2026-08-07T12:30:23Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr k-stars visible-astronomy spectroscopy metallicity line-intensities stellar-spectral-types K-type stars are important objects of our Galaxy. It is interesting to determine the stellar physical parameters and magnetic activity properties of K-type stars. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR10 provides more than 1 million spectra of K-type stars. We have used spectra with a signal-to-noise ratio greater than 10 as our objects in the large amount of spectral data that we have analyzed. We used the spectral subtraction method to reduce the observational spectra by utilizing the iSpec program. We have determined the chromospheric activity of K-type stars using the H{alpha} line. Among more than 1.33 million spectra associated with about 1.06 million stars, there are a total of 150,000 stellar spectra that have excess chromospheric activity. For K stars with rotation periods above 6.20 days, the chromospheric activity decreases rapidly as the period increases. We calculated the solar Rossby number R_Osun_=1.85, and conclude that when the Rossby number R_O_/R_Osun_<0.07, R'_Halpha_ remains stable; when R_O_/R_Osun_>>0.07, R'_Halpha_ decreases as R_O_/R_Osun_ increases. By crossmatching with the Gaia survey, we also determined their distances and found that the active fraction decreases as the distance above the Galactic disk increases. 2025ApJS..281....5Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/5 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-) II/328 : AllWISE Data Release (Cutri+ 2013) V/146 : LAMOST DR1 catalogs (Luo+, 2015) V/164 : LAMOST DR5 catalogs (Luo+, 2019) I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021) IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) V/162 : LAMOST DR11 catalogs (Luo+, 2026) J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004) J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008) J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008) J/ApJ/743/48 : Stars with rot. periods & X-ray luminosities (Wright+, 2011) J/AJ/143/93 : Rotational velocities in early-M stars (Reiners+, 2012) J/ApJ/795/161 : Activity and rot. in Praesepe and the Hyades (Douglas+, 2014) J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014) J/A+A/594/A39 : LAMOST-Kepler param. and activity indicators (Frasca+, 2016) J/ApJ/834/85 : H{alpha} emission in nearby M dwarfs (Newton+, 2017) J/MNRAS/476/908 : Chromospheric activity in 4 open clusters (Fang+, 2018) J/ApJS/244/21 : Surface rot. & activity of Kepler stars. I. (Santos+, 2019) J/A+A/635/A43 : Stellar rot. periods from K2 Campaigns 0-18 (Reinhold+, 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/268/4 : Stellar var. with TESS 2min cadence phot. (Fetherolf+, 2023) J/ApJS/264/17 : Spectroscopic data of TESS objects with LAMOST (Zhang+, 2023) J/ApJS/271/60 : Magnetic activity of G stars from LAMOST+TESS (Su+, 2024) J/A+A/688/A23 : Stellar chromospheric activity from LAMOST (Zhang+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/281/5 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/281/5 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/281/5 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/281/5 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/281/5 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/281/5 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/281/5/table1 (Spectral parameters of K stars from LAMOST DR10 observation with WISEA identifier) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/281/5/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/281/5/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/281/5/table1? GET text/xml+votable 180.0 50000 true 0.058625 51.8185 0.005555555555555556 Cone search capability for table J/ApJS/281/5/table1b (Spectral parameters of K stars from LAMOST DR10 observation without WISEA identifier; table added by the author) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/281/5/table1b? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/281/5/table1b? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/281/5/table1b? GET text/xml+votable 180.0 50000 true 98.957988 26.567385 0.005555555555555556 Cone search capability for table J/ApJS/281/5/table2 (Location of K-type stars of our samples in our Galaxy) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/281/5/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/281/5/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/281/5/table2? GET text/xml+votable 180.0 50000 true 45.0192917 -2.8529722 0.005555555555555556 2/1 3 5-6 8-10 18-20 22 24 26 34-36 40 85 91 93-95 105 109 3/0 2 9-11 16 18-19 28-29 44 48-49 66-68 71 84-86 92 94 101-103 108-110 112-113 129-130 132 134-135 148 150 153-154 164 166-168 171 173 210 212 215-216 233-235 277 283-284 286 295 297 299-300 303-304 306 310 317 319 345-346 348 350-351 362-363 368 370-371 406-407 413 415 425-426 428 430-431 434 442 445-447 487 494-496 498 502 504-505 510 4/4-6 13-15 33-35 68-69 71 120-122 124-126 181-183 185-187 201 203 208 210-212 217 224 256-258 260-262 276-277 279-280 282-283 348-349 351 373-375 400-401 444 456-458 464 480 482 512-514 524 527 533-535 597 599 604 606-607 610-611 620-621 623-625 628-630 633-634 660 662-663 676-678 680-681 689 691 696-697 699-701 705-710 712-714 716 736 772-773 781 786-788 790-792 796 798-799 802 812 814 825 830 833 835 837-839 844-846 853-857 859 868 872-873 876 878 880-881 887 889 900-901 904 911 916 920 922-923 929-931 944-946 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32396 32416 32418-32419 32424 32426-32427 32446-32447 32489-32491 32564 32566-32567 32581-32585 32587 32628-32629 32631 32708-32709 32711 36711 36714-36715 36722-36723 36757 36759 36767 36779 36781 36794 36832-36833 36836-36837 36839 36842-36843 36849-36851 40797 40882-40883 40888 40890-40891 40902-40905 40907 40913-40915 44979 44985-44987 44990-44991 45017-45019 45026 48983 48998-48999 49013-49014 49020 49022-49023 49092-49093 49095 49113 49141 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/281/5?format=ascii Optical default J/ApJS/281/5/table1 Spectral parameters of K stars from LAMOST DR10 observation with WISEA identifier WISEA ALLWISE Identifier, from TESS cross-match (JHHMMSS.ss+DDMMSS.s) if any meta.id;meta.main char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Loc Location of K-type stars in our Galaxy data (link to Table 2) meta.number int nullable m_WISEA Number of measurements for this star ("999" si WISEA is empty) meta.number int nullable subCl K type spectral subclass src.spType char snru [0/374]? S/N of u band LAMOST spectra stat.snr;em.opt.U double nullable snrg [0.7/999]? S/N of g band LAMOST spectra stat.snr;em.opt.B double nullable snrr [0/999]? S/N of r band LAMOST spectra stat.snr;em.opt.R double nullable snri [0/999]? S/N of i band LAMOST spectra stat.snr;em.opt.I double nullable snrz [0/999]? S/N of z band LAMOST spectra stat.snr;em.opt.I double nullable Teff [3752/7282] Surface effective temperature (G1) K phys.temperature.effective float e_Teff [0/997]? Uncertainty in Teff (G1) K stat.error;phys.temperature.effective double nullable feh [-2.5/0.75] Metallicity (G1) phys.abund.Fe float e_feh [0/1]? Uncertainty in feh (G1) stat.error;phys.abund.Fe double nullable logg [0.08/4.9] Log, Surface gravity (G1) log(cm.s**-2) phys.gravity float e_logg [0/1.2]? Uncertainty in logg (G1) log(cm.s**-2) stat.error;phys.gravity double nullable EWpHa [-905/111] Equivalent Width, H{alpha}, in Angstroms (G2) 0.1nm spect.line.eqWidth;em.line.Halpha double e_EWpHa [0.001/52] Uncertainty in EWpHa (G2) 0.1nm stat.error;spect.line.eqWidth;em.line.Halpha double State [YN] Active state meta.code char DR11 Display data from LAMOST LRS DR11 within 1" meta.ref.url char TIC Display data from TIC v8.2 (IV/39) within 3" meta.ref.url char _RA Positions from WISEA names (right ascension part) deg pos.eq.ra;meta.main nullable indexed _DE Positions from WISEA names (declination part) deg pos.eq.dec;meta.main nullable indexed
J/ApJS/281/5/table1b Spectral parameters of K stars from LAMOST DR10 observation without WISEA identifier; table added by the author recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int objID [102110/1018101158] Unique spectrum ID from LAMOST meta.id;meta.main long RAJ2000 LAMOST right ascension (J2000) deg pos.eq.ra;meta.main indexed subCl K type spectral subclass src.spType char DEJ2000 [-9.1/87] LAMOST declination (J2000) deg pos.eq.dec;meta.main indexed snru [0/160]? S/N of u band LAMOST spectra stat.snr;em.opt.U double nullable snrg [2.8/804]? S/N of g band LAMOST spectra stat.snr;em.opt.B double nullable snrr [4.6/999]? S/N of g band LAMOST spectra stat.snr;em.opt.R double nullable snri [0/999]? S/N of g band LAMOST spectra stat.snr;em.opt.I double nullable snrz [0/999]? S/N of g band LAMOST spectra stat.snr;em.opt.I double nullable Teff [3769/6817] Surface effective temperature (G1) K phys.temperature.effective float e_Teff [0/614]? Teff uncertainty K stat.error;phys.temperature.effective double nullable feh [-1.83/0.66] Metallicity (G1) phys.abund.Fe float e_feh [0/0.7]? feh uncertainty stat.error;phys.abund.Fe double nullable logg [0.1/4.9] Log of surface gravity (G1) log(cm.s**-2) phys.gravity float e_logg [0/1.015]? logg uncertainty log(cm.s**-2) stat.error;phys.gravity double nullable EWpHa [-6.8/61.6] Equivalent Width, H{alpha}, in Angstroms (G2) 0.1nm spect.line.eqWidth;em.line.Halpha double e_EWpHa [0.0017/1.4] EWpHa uncertainty 0.1nm stat.error;spect.line.eqWidth;em.line.Halpha float State [YN] Active state meta.code char TIC Display data from TIC v8.2 (IV/39) within 3" meta.ref.url char
J/ApJS/281/5/table2 Location of K-type stars of our samples in our Galaxy TIC Display data from TIC v8.2 (IV/39) within 3" meta.ref.url char Gaia Display data from Gaia DR3 (I/355) and Bailer-Jones+ 2021, I/352 within 3" meta.ref.url char _RA Positions from WISEA names (right ascension part) deg pos.eq.ra;meta.main nullable indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int sp Spectral parameters of K-type stars (link to Table 1) meta.number int nullable WISEA ALLWISE ID, from TESS cross-match (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char Dist [26/33103] Distance from Gaia DR3 (geometric), Gaia DR3 pc pos.distance double pmRA [-217/215] Proper motion, in RA, Gaia DR3 mas/yr pos.pm;pos.eq.ra double pmDE [-208/150] Proper motion, in DE, Gaia DR3 mas/yr pos.pm;pos.eq.dec double Z [-18.9/32.2] Distance (height) from the Galactic disk pc pos.cartesian.z;pos.galactic double R [0.73/21.7] Radial distance away from the Galactic center pc phys.size.radius double DR11 Display data from LAMOST LRS DR11 within 1" meta.ref.url char _DE Positions from WISEA names (declination part) deg pos.eq.dec;meta.main nullable indexed