J/A+A/594/A39ivo://CDS.VizieR/J/A+A/594/A39doi:10.26093/cds/vizier.35940039CDSFrasca A.Molenda-Zakowicz J.De Cat P.Catanzaro G.Fu J.N.,Ren A.B.Luo A.L.Shi J.R.Wu Y.Zhang H.T.2018-09-03T10:11:32Z2016-10-07T08:24:43ZCDS support team

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

cds-question@unistra.frsurveyseffective-temperatureradial-velocityline-intensitiesA comprehensive and homogeneous determination of stellar parameters for the stars observed by the Kepler space telescope is necessary for statistical studies of their properties. As a result of the large number of stars monitored by Kepler, the largest and more complete databases of stellar parameters published to date are multiband photometric surveys. The LAMOST-Kepler survey, whose spectra are analyzed in the present paper, was the first large spectroscopic project, which started in 2011 and aimed at filling that gap. In this work we present the results of our analysis, which is focused on selecting spectra with emission lines and chromospherically active stars by means of the spectral subtraction of inactive templates. The spectroscopic determination of the atmospheric parameters for a large number of stars is a by-product of our analysis. We have used a purposely developed version of the code ROTFIT for the determination of the stellar parameters by exploiting a wide and homogeneous collection of real star spectra, namely the Indo US library. We provide a catalog with the atmospheric parameters (Teff, logg, and [Fe/H]), radial velocity (RV), and an estimate of the projected rotation velocity (vsini). For cool stars (Teff<6000K), we also calculated the H-alpha and CaII-IRT fluxes, which are important proxies of chromospheric activity. We have derived the RV and atmospheric parameters for 61753 spectra of 51385 stars. The average uncertainties, which we estimate from the stars observed more than once, are about 12km/s, 1.3%, 0.05dex, and 0.06dex for RV, Teff, logg, and [Fe/H], respectively, although they are larger for the spectra with a very low signal-to-noise ratio. Literature data for a few hundred stars (mainly from high-resolution spectroscopy) were used to peform quality control of our results. The final accuracy of the RV is about 14km/s. The accuracy of the Teff, logg, and [Fe/H] measurements is about 3.5%, 0.3dex, and 0.2dex, respectively. However, while the Teff values are in very good agreement with the literature, we noted some issues with the determination of [Fe/H] of metal poor stars and the tendency, for logg, to cluster around the values typical for main-sequence and red giant stars. We propose correction relations based on these comparisons and we show that this does not have a significant effect on the determination of the chromospheric fluxes. The RV distribution is asymmetric and shows an excess of stars with negative RVs that are larger at low metallicities. Despite the rather low LAMOST resolution, we were able to identify interesting and peculiar objects, such as stars with variable RV, ultrafast rotators, and emission-line objects. Based on the H-alpha and CaII-IRT fluxes, we found 442 chromospherically active stars, one of which is a likely accreting object. The availability of precise rotation periods from the Kepler photometry allowed us to study the dependency of these chromospheric fluxes on the rotation rate for a very large sample of field stars.2016A&A...594A..39Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/594/A39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)V/146 : LAMOST DR1 catalogs (Luo+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/594/A39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/594/A39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/594/A39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/594/A39https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/594/A39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/594/A39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/594/A39/tablea3 (Stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A39/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A39/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A39/tablea3?GETtext/xml+votable180.050000true295.652160646.91007610.005555555555555556Cone search capability for table J/A+A/594/A39/tablea4 (Activity indicators)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A39/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A39/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A39/tablea4?GETtext/xml+votable180.050000true283.9161069438.864498060.0055555555555555564/911 922-923 933-935 944-946 5/3643 3682-3683 3686-3687 3698-3699 3704 3706-3707 3729-3731 3749 3760-3761 3764-3765 3788-3789 3792 3794 6/14558-14559 14567 14726-14727 14738-14739 14786-14787 14790 14820-14822 14877 14879 14901 14903 14909-14911 14913-14915 15053 15064-15065 15160-15162 15164 15172-15174 15180 15182 15200-15202 15232-15234 15236https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/594/A39?format=asciidefaultJ/A+A/594/A39/tablea3Stellar parametersKICKepler Input Catalog numbermeta.id;meta.mainintS/NrSignal-to-noise ratio in r bandstat.snr;instr.bandpassintRAJ2000Right ascention (J2000)degpos.eq.ra;meta.mainindexedSpNameLAMOST spectrum namemeta.id;meta.filecharHJDReduced Heliocentric Julian day (HJD-2400000)dtime.epoch;pos.heliocentricdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTDisplay the nearest LAMOST DR1 (Cat. V/146) spectrum within 3 arcsecmeta.ref.urlcharDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedSpTypeSpectral type in MK or HDsrc.spTypecharTeffEffective 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.errorfloat[Fe/H]Iron abundance relative to the Sunlog(Sun)phys.abund.Fefloate_[Fe/H]Error on iron abundance relative to the Sunlog(Sun)stat.error;phys.abund.FefloatHRV? Heliocentric Radial Velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HRV? Heliocentric Radial Velocity errorkm/sstat.errorfloatnullablel_vsiniLimit flag on vsinimeta.code.error;phys.veloc.rotatcharvsiniProjected rotational velocitykm/sphys.veloc.rotatinte_vsini? Projected rotational velocity errorkm/sstat.error;phys.veloc.rotatintnullableP(chi2)Chi-square probability for RV variationsstat.fit.goodnessfloat[Fe/H]corCorrected iron abundance relative to the Sun (1)log(Sun)phys.abund.FefloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/594/A39/tablea4Activity indicatorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTDisplay the nearest LAMOST DR1 (Cat. V/146) spectrum within 3 arcsecmeta.ref.urlcharSpNameLAMOST spectrum namemeta.id;meta.filecharHJDReduced Heliocentric Julian day (HJD-2400000)dtime.epoch;pos.heliocentricdoubleKICKepler Input Catalog numbermeta.id;meta.mainintRAJ2000Right Ascention (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainEWHa? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EWHa? H{alpha} equivalent width error0.1nmstat.errorfloatnullablen_EWHa[END ] H{alpha} behavior (1)meta.notecharEW8498? CaII-8498 equivalent width0.1nmspect.line.eqWidthfloatnullablee_EW8498? CaII-8498 equivalent width error0.1nmstat.errorfloatnullableEW8542? CaII-8542 equivalent width0.1nmspect.line.eqWidthfloatnullablee_EW8542? CaII-8542 equivalent width error0.1nmstat.errorfloatnullableEW8662? CaII-8542 equivalent width0.1nmspect.line.eqWidthfloatnullablee_EW8662? CaII-8542 equivalent width error0.1nmstat.errorfloatnullableProt? Rotational perioddtime.periodfloatnullabler_ProtReference for Prot (2)meta.ref;pos.framechar