J/ApJS/281/39ivo://CDS.VizieR/J/ApJS/281/39CDSXu F.Gu S.Xiang Y.2026-08-10T11:24:57Z2026-08-10T12:10:31ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsmetallicityradial-velocityabsolute-magnitudeline-intensitiesvisible-astronomyspectroscopyphotometryvariable-starsIn the early stages of their lives, young stars harbor diverse processes exhibiting strong signatures, making them ideal targets for investigating stellar accretion, dynamo actions, and exoplanet formation. However, the current samples of active stars are highly limited in both number and parameter space, suffering from significant statistical uncertainties. By simultaneously measuring the activity proxy, the Balmer H{alpha}6563{AA} line emission, and the youth indicator, the lithium 6708{AA} line, with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra, we have identified more than 1000 candidates of active young stars (aYSs) with Teff<=7000K and logg>=3.5 in the Kepler prime field. Then we matched 660 stars with the Kepler light curves, and determined their periods and variable types. Based on these light curves, we are left with 78 dubious and 52 stable stars, and we have identified 22 eclipsing binaries, 3 heartbeat binaries, 1 transiting exoplanetary system candidate, 13 long-period variables, 61 pulsating stars, 18 irregular variables, 57 T Tauri stars, 173 flaring stars, and 435 rotational variables (the numbers are not exclusive). Supplementing the cluster-based samples, this sample has a broader parameter space coverage. This work will be beneficial for identifying aYSs in much larger datasets, such as the one produced by crossmatching between the LAMOST and Transiting Exoplanet Survey Satellite surveys, and the future survey conducted by the Chinese Space Station Survey Telescope.2025ApJS..281...39Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)V/164 : LAMOST DR5 catalogs (Luo+, 2019)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)V/162 : LAMOST DR11 catalogs (Luo+, 2026)J/MNRAS/358/13 : Faint dwarfs in NGC 2547 (Jeffries+, 2005)J/other/A+ARV/17.251 : Stars observed with Doppler imaging (Strassmeier, 2009)J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)J/A+A/575/A57 : LQ Hya activity and Li variations (Flores Soriano+, 2015)J/A+A/591/A43 : Differential rotation in solar-like stars (Distefano+, 2016)J/ApJS/235/38 : Kepler planet cand. VIII. DR25 reliability (Thompson+, 2018)J/ApJ/902/114 : Stellar activity. I. Chandra, Gaia & GALEX (Wang+, 2020)J/ApJS/260/45 : Stellar param. of M-type stars from LAMOST DR8 (Ding+, 2022)J/A+A/664/A78 : Kepler targets class based on LAMOST spectra (Frasca+, 2022)J/ApJ/936/23 : Young stellar objects Gaia EDR3 properties (Wang+, 2022)J/MNRAS/514/4781 : Active stars in the LAMOST-K2 field (Xiang+, 2022)J/ApJS/266/28 : Orbital parameters of Kepler heartbeat stars (Li+, 2023)J/ApJS/271/58 : Lithium abundances from LAMOST MRS DR9 spectra (Ding+, 2024)J/A+A/685/A83 : Members for 41 open clusters (Gutierrez Albarran+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/281/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/281/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/281/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/281/39https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/281/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/281/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/281/39/table1 (Input catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/281/39/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/281/39/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/281/39/table1?GETtext/xml+votable180.050000true283.762916834.56063030.0055555555555555563/233 4/911 920 922-923 926 929 931 941 944-946 5/3631 3635 3638-3639 3641 3643 3657-3660 3686-3687 3696 3698-3699 3702 3708-3710 3715 3720-3721 3723 3748-3749 3760-3761 3788-3790 3792 3794 6/14461 14463 14523 14539 14546-14547 14549-14551 14561 14563 14569-14571 14607 14618 14626-14627 14646 14648-14650 14652-14653 14736 14738-14739 14743 14788 14790-14791 14802 14812 14814-14815 14844-14846 14855 14859 14888-14889 14891 14980-14981 14983 15000-15001 15004-15005 15048-15049 15052-15053 15164-15165 15172-15174 15180 15182 15184-15185 15200-15202 15232-15234 15236 15240 15242-15243 15245-15247 15250 15520 15522https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/281/39?format=asciiOpticaldefaultJ/ApJS/281/39/table1Input cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_LAMOSTNumber of EW measurements for this sourcemeta.numberintnullableKIC[43465/13154091]? Kepler identifiermeta.id.crossintnullableRAJ2000[277.5/304.5] Right Ascension, LAMOST (J2000)degpos.eq.ra;meta.mainindexedDEJ2000[34/53] Declination, LAMOST (J2000)degpos.eq.dec;meta.mainindexedObsID[52101002/1128116245] LAMOST unique observation IDmeta.id;obslongSNR[0/999]? Spectral signal to noise (2)stat.snrintnullableTeff[3012/7000] Surface effective temperature, assembled (3)Kphys.temperature.effectivefloate_Teff[3/999]? Uncertainty in TeffKstat.error;phys.temperature.effectivefloatnullablelogg[3.5/5.9] Log, surface gravity, assembled (3)log(cm.s**-2)phys.gravityfloate_logg[0.002/1.2]? Uncertainty in logglog(cm.s**-2)stat.error;phys.gravityfloatnullableFeH[-2.68/1]? Metallicity, assembled (3)phys.abund.Fefloatnullablee_FeH[0.003/1]? Uncertainty in FeHstat.error;phys.abund.FefloatnullableRV[-378/422]? Radial velocity, assembled or derived (3)km/sspect.dopplerVelocfloatnullablee_RV[0/172]? Uncertainty in RVkm/sstat.error;spect.dopplerVelocfloatnullableGaiaDR3? Gaia DR3 source IDmeta.id.crossnullableGMag[-8.3/11.7]? Gaia absolute Gmagmagphys.magAbs;em.optdoublenullableBP-RP[-0.41/2.9]? Gaia color index, GBP-GRPmagphot.color;em.opt.B;em.opt.RdoublenullableRMScontJ/ApJS/281/39/table2Final catalogue of identified active young star (aYS) candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRSLAMOST spectroscopic survey release (G1)meta.tablecharLAMOSTLAMOST target ID designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharTypeVariable Type (2)meta.code;src.varcharm_LAMOSTNumber of EW measurements for this sourcemeta.numberintnullableObsID[52104082/1128115131] LAMOST unique observation IDmeta.id;obslongKIC[1028018/12835007]? Kepler identifiermeta.id.crossintnullableEWHa[0.017/10.5] Final Halpha equivalent width, Equation 10.1nmspect.line.eqWidth;em.line.Halphadoublee_EWHa[0.004/0.5] Uncertainty in EWHa0.1nmstat.error;spect.line.eqWidth;em.line.HalphadoubleEWLi[0.007/1.8] Final Li equivalent width, Eq. 10.1nmspect.line.eqWidthdoublee_EWLi[0.002/0.1] Uncertainty in EWLi0.1nmstat.error;spect.line.eqWidthdoublePer[0.1/90]? Dominant Perioddtime.perioddoublenullablee_Per[0.0003/2.7]? Uncertainty in Perdstat.error;time.perioddoublenullablePorb[0.49/71.8]? Orbital Perioddtime.perioddoublenullablee_Porb[0.003/0.4]? Uncertainty in Porbdstat.error;time.perioddoublenullable