J/A+A/657/A66ivo://CDS.VizieR/J/A+A/657/A66doi:10.26093/cds/vizier.36570066CDSTabernero H.M.Marfil E.Montes D.Gonzalez Hernandez J.I.2022-05-18T12:42:38Z2022-01-11T09:31:51ZCDS support team

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

cds-question@unistra.fratomic-physicsSteParSyn is an automatic code written in Python 3.X designed to infer the stellar atmospheric parameters Teff, log(g), and [Fe/H] of FGKM-type stars following the spectral synthesis method. We present a description of the SteParSyn code and test its performance against a sample of late-type stars that were observed with the HERMES spectrograph mounted at the 1.2-m Mercator Telescope. This sample contains 35 late-type targets with well-known stellar parameters determined independently from spectroscopy. The code is available to the astronomical community in a GitHub repository. SteParSyn uses a Markov chain Monte Carlo (MCMC) sampler to explore the parameter space by comparing synthetic model spectra generated on the fly to the observations. The synthetic spectra are generated with an spectral emulator. Results: We computed Teff, log(g), and [Fe/H] for our sample stars and discussed the performance of the code. We calculated an internal scatter for these targets of -12+/-117K in Teff, 0.04+/-0.14dex in log(g), and 0.05+/-0.09dex in [Fe/H]. In addition, we find that the log(g) values obtained with SteParSyn are consistent with the trigonometric surface gravities to the 0.1dex level. Finally, SteParSyn can compute stellar parameters that are accurate down to 50K, 0.1dex, and 0.05dex for Teff, log(g), and [Fe/H] for stars with vsini<=30km/s.2022A&A...657A..66Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/657/A66CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/657/A66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/657/A66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/657/A66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/657/A66https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/657/A66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/657/A66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/657/A66/tablea5Lines of FeI and FeII lines and spectral ranges employedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintb_lambda[4806/7912] Start of the wavelength range0.1nmtime.start;em.wlfloatB_lambda[4811/7915] End of the wavelength range0.1nmtime.end;em.wlfloatlambda[4808/7913] Central wavelength of the line0.1nmem.wl.central;spect.linedoubleElElementphys.atmol.elementcharIon[1/2] Ionsation stage, 1: neutral, 2: singly ionisedphys.atmol.ionStageintElowLower excitation potentialeVphys.atmol.excitation;stat.minfloatloggf[-5.97/0.52] Oscillator strengthphys.atmol.oscStrengthfloat