J/A+A/698/A7ivo://CDS.VizieR/J/A+A/698/A7doi:10.26093/cds/vizier/bc-nt/lhCDSFrasca A.Zhang J.Y.Alonso-Santiago J.Fu J.N.Molenda-Zakowicz J.,Catanzaro G.De Cat P.2026-08-03T06:55:10Z2025-05-23T11:58:37ZCDS support team

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

cds-question@unistra.fropen-star-clusterschemical-abundanceseffective-temperatureradial-velocitynarrow-band-photometryatomic-spectroscopyIn this work, we present the results of our analysis of medium-resolution LAMOST spectra of late-type candidate members of the Pleiades with the aim of determining the stellar parameters, activity level, and lithium abundance. We used the ROTFIT code to determine the atmospheric parameters (Teff, logg, and [Fe/H]), along with the radial velocity (RV) and projected rotation velocity (vsini). Moreover, for late-type stars (Teff<=6500K), we also calculated the H{alpha} and LiI 6708 net equivalent width by means of the subtraction of inactive photospheric templates. We also used the rotation periods from the literature and we purposely determined them for 89 stars by analyzing the available Transiting Exoplanet Survey Satellite (TESS) photometry. We derived RV, vsini, and atmospheric parameters for 1581 spectra of 283 stars. Literature data were used to assess the accuracy of the derived parameters. The RV distribution of the cluster members peaks at 5.0km/s with a dispersion of 1.4km/s, while the average metallicity is [Fe/H]=-0.03+/-0.06, in line with previous determinations. Fitting empirical isochrones of Li depletion to EW measures of stars with Teff<6500K, we obtain a reliable age for the Pleiades of 118+/-6Myr, in agreement with the recent literature. The activity indicators H-alpha line flux (F_Ha_) and luminosity ratio (R'_Ha_) show the hottest stars to be less active, on average, than the coldest ones, as expected for a 100-Myr old cluster. When plotted against the Rossby number R_O_, our R'_Ha_ values display the typical trend with a steep decay for R_O_>0.2 and a nearly flat (saturated) activity level for smaller values. However, we still see a slight dependence on R_O_ in the saturated regime which is well fitted by a power law with a slope of -0.18+/-0.02, in agreement with some previous work. For three sources with multi-epoch data we have found LAMOST spectra acquired during flares, which are characterized by strong and broad H-alpha profiles and the presence of the HeI-6678 emission line. Among our targets we identify 39 possible SB1 and ten SB2 systems. We have also shown the potential of the LAMOST-MRS spectra, which allowed us to refine the orbital solution of some binary and to discover a new double-lined binary.2025A&A...698A...7Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/698/A7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/594/A39 : LAMOST-Kepler parameters & activity indicators (Frasca+, 2016)J/A+A/664/A78 : Kepler targets class based on LAMOST spectra (Frasca+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/698/A7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/698/A7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/698/A7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/698/A7https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/698/A7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/698/A7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/698/A7/table1 (Stellar parameters of the investigated sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/698/A7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/698/A7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/698/A7/table1?GETtext/xml+votable180.050000true58.6159711121.389748060.005555555555555556Cone search capability for table J/A+A/698/A7/table4 (Lithium equivalent widths and abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/698/A7/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/698/A7/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/698/A7/table4?GETtext/xml+votable180.050000true58.6159711121.389748060.005555555555555556Cone search capability for table J/A+A/698/A7/tablea2 (Radial velocities for individual spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/698/A7/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/698/A7/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/698/A7/tablea2?GETtext/xml+votable180.050000true58.6159711121.389748060.0055555555555555565/113 115-116 118 124 6/329 332 337 365 367-369 375 378 383 437 448 457-458 480-481 483-486 492-494 504 507 788 793 832 838-839 862 1162https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/698/A7?format=asciidefaultJ/A+A/698/A7/table1Stellar parameters of the investigated sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGaiaDR3Gaia DR3 source_id (source_id)meta.id;meta.mainTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Effective temperature errorKstat.error;phys.temperature.effectiveintnullablelogg? Logarithm of surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Error on logarithm of surface gravitylog(cm.s**-2)stat.errorfloatnullable[Fe/H]? Iron abundance relative to the Sunlog(Sun)phys.abund.Fefloatnullablee_[Fe/H]? Error on iron abund relative to the Sunlog(Sun)stat.error;phys.abund.Fefloatnullablel_vsiniLimit flag on vsinimeta.code.error;phys.veloc.rotatcharvsini? Projected rotational velocitykm/sphys.veloc.rotatfloatnullablee_vsini? Projected rotational velocity errorkm/sstat.error;phys.veloc.rotatfloatnullableSpTypeSpectral type in MK or HDsrc.spTypecharSubSubsample (G1)meta.idcharHRV? Average heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentric;stat.meanfloatnullablee_HRV? Heliocentric radial velocity errorkm/sstat.errorfloatnullableP(chi2)Chi-square probability for RV variationsstat.fit.chi2doubleProt? Rotational perioddtime.periodfloatnullabler_Prot[RT] Reference for Prot (2)meta.ref;pos.framecharRemarksRemarks of RV variability (3)meta.notecharGDR3Display the Gaia DR3 datameta.ref.urlcharJ/A+A/698/A7/table3Chromospheric activity indicatorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget designation (JHHMMSS.ss+DDMMSS.s)meta.idcharGaiaDR3Gaia DR3 source_id (source_id)meta.id;meta.mainTeffEffective temperatureKphys.temperature.effectiveinte_TeffEffective temperature errorKstat.error;phys.temperature.effectiveintloggLogarithm of surface gravitylog(cm.s**-2)phys.gravityfloate_loggError on logarithm of surface gravitylog(cm.s**-2)stat.errorfloatl_EWHa? Limit flag on H{alpha} equivalent widthmeta.code.errorcharEWHaH{alpha} equivalent width0.1nmspect.line.eqWidthfloate_EWHa? H{alpha} equivalent width error0.1nmstat.errorfloatnullableFHaH{alpha} fluxmW.m**-2phot.flux;em.line.Halphadoublee_FHa? H{alpha} flux errormW.m**-2stat.errordoublenullablelogR'Halog(L_H{alpha}_/L_bol_) (1)phot.flux;arith.ratiofloate_logR'Ha? Error of log(L_H{alpha}_/L_bol_) (1)stat.errorfloatnullableSubSubsample (G1)meta.idcharJ/A+A/698/A7/table4Lithium equivalent widths and abundanceslogg? Logarithm of surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Error on logarithm of surface gravitylog(cm.s**-2)stat.errorfloatnullablel_EW(Li)? Limit flag on EW(Li)meta.code.errorcharEW(Li)? Lithium equivalent width0.1pmspect.line.eqWidthintnullablee_EW(Li)? rms uncertainty on EW(Li)0.1pmstat.errorintnullableA(Li)? Lithium abundancephys.abundfloatnullablee_A(Li)? error on A(Li)stat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget designation (JHHMMSS.ss+DDMMSS.s)meta.idcharGaiaDR3Gaia DR3 source_id (source_id)meta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Effective temperature errorKstat.error;phys.temperature.effectiveintnullableSubSubsample (G1)meta.idcharJ/A+A/698/A7/tablea2Radial velocities for individual spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget designation (JHHMMSS.ss+DDMMSS.s)meta.idcharGaiaDR3Gaia DR3 source_id (source_id)meta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainHJDReduced heliocentric Julian day (HJD-2400000)dtime.epoch;pos.heliocentricdoubleSpNameLAMOST spectrum namemeta.id;meta.filecharHRVred? Heliocentric radial velocity red armkm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRVred? Heliocentric radial velocity red errorkm/sstat.errorfloatnullableHRVblu? Heliocentric radial velocity blue armkm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRVblu? Heliocentric radial velocity blue errorkm/sstat.errorfloatnullableHRVcor? Corrected heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRVcor? Corrected heliocentric RV errorkm/sstat.errorfloatnullableSubSubsample (G1)meta.idchar