J/A+A/577/A132ivo://CDS.VizieR/J/A+A/577/A132doi:10.26093/cds/vizier.35770132CDSMaldonado J.Affer L.Micela G.Scandariato G.Damasso M.Stelzer B.,Barbieri M.Bedin L.R.Biazzo K.Bignamini A.Borsa F.Claudi R.U.,Covino E.Desidera S.Esposito M.Gratton R.Gonzalez Hernandez J.I.,Lanza A.F.Maggio A.Molinari E.Pagano I.Perger M.Pillitteri I.,Piotto G.Poretti E.Prisinzano L.Rebolo R.Ribas I.Shkolnik E.,Southworth J.Sozzetti A.Suarez Mascareno A.2015-09-09T18:46:04Z2015-05-18T13:20:45ZCDS support team

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

cds-question@unistra.frm-starsmetallicityspectroscopyLow-mass stars have been recognised as promising targets in the search for rocky, small planets with the potential of supporting life. As a consequence, Doppler search programmes using high-resolution spectrographs like HARPS or HARPS-N are providing huge quantities of optical spectra of M dwarfs. We aim to calibrate empirical relationships to determine accurate stellar parameters for early M dwarfs (spectral types M0-M4.5) using the same spectra that are used for the radial velocity determinations. Our methodology consists in the use of ratios of pseudo equivalent widths of spectral features. Stars with effective temperatures obtained from interferometric estimates of their radii are used as calibrators. Empirical calibrations for the spectral type are also provided. Combinations of features and ratios of features are used to derive calibrations for the stellar metallicity.2015A&A...577A.132Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/577/A132CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/577/A132https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/577/A132http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/577/A132https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/577/A132https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/577/A132http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/577/A132GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/577/A132/table2Coefficients of our feature ratio-temperature relationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1Wavelength of the numerator of the temperature-sensitive ratio {lambda}_1_0.1nmem.wlfloatdelta1Width of the feature {Delta}{lambda}_1_0.1nmspect.line.widthfloatlambda2Wavelength of the denominator of the temperature-sensitive ratio {lambda}_2_0.1nmem.wlfloatdelta2Width of the feature {Delta}{lambda}_2_0.1nmspect.line.widthfloataCoefficient "a" of the calibration (1)meta.notedoublebCoefficient "b" of the calibration (1)stat.fit.paramdoublec? Coefficient "c" of the calibration (1)stat.fit.paramfloatnullablefuncFunctional form of the calibration (1)meta.codecharsigma[49/75] Standard deviation of the calibrationKstat.stdevfloatJ/A+A/577/A132/table4Coefficients of our spectral type calibrationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1Wavelength of the numerator of the spectral-type sensitive ratio {lambda}_1_ (2)0.1nmem.wlfloatlambda2Wavelength of the denominator of the spectral-type sensitive ratio {lambda}_2_ (2)0.1nmem.wlfloata0Zero order coefficient of the calibration a_0_stat.variance;instr.calib;src.calibfloata1First order coefficient of the calibration a_1_instr.calib;src.calib;obs.calibdoublea2Second order coefficient of the calibration a_2_meta.notedoublea3Third order coefficient of the calibration a_3_meta.notedoublesigma[0.4/0.5] Standard deviation of the calibrationstat.stdevfloatJ/A+A/577/A132/table6Coefficients of our metallicity calibrations.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1Wavelength of the metal-sensitive feature ({lambda}_1_)0.1nmem.wlfloatlambda2Wavelength of the numerator of the temperature-sensitive ratio ({lambda}_2_)0.1nmem.wlfloatlambda3Wavelength of the denominator of the temperature-sensitive ratio ({lambda}_3_)0.1nmem.wlfloatAA coefficient of the calibration (3)phys.atmol.transProb;src.calib;obs.calibdoubleBB coefficient of the calibration (3)stat.fit.paramdoubleCC coefficient of the calibration (3)instr.calib;src.calib;obs.calibdoublesigma[0.07/0.1] Standard deviation of the calibrationlog(Sun)stat.stdevfloat