J/A+A/571/A47ivo://CDS.VizieR/J/A+A/571/A47doi:10.26093/cds/vizier.35710047CDSMasseron T.Plez B.Van Eck S.Colin R.Daoutidis I.Godefroid M.,Coheur P.-F.Bernath P.Jorissen A.Christlieb N.2017-03-16T15:07:24Z2014-11-06T07:27:17ZCDS support team

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

cds-question@unistra.fratomic-physicsThe advent of high-resolution spectrographs and detailed stellar atmosphere modelling has strengthened the need for accurate molecular data. Carbon-enhanced metal-poor (CEMP) stars spectra are interesting objects with which to study transitions from the CH molecule. We combine programs for spectral analysis of molecules and stellar-radiative transfer codes to build an extensive CH linelist, including predissociation broadening as well as newly identified levels. We show examples of strong predissociation CH lines in CEMP stars, and we stress the important role played by the CH features in the Bond-Neff feature depressing the spectra of barium stars by as much as 0.2~magnitudes in the {lambda}=3000-5500{AA} range. Because of the extreme thermodynamic conditions prevailing in stellar atmospheres (compared to the laboratory), molecular transitions with high energy levels can be observed. Stellar spectra can thus be used to constrain and improve molecular data.2014A&A...571A..47Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/571/A47CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/425/34 : ExoMol line lists for BeH, MgH and CaH (Yadin+, 2012)J/MNRAS/434/1469 : ExoMol line lists for SiO (Barton+, 2013)J/MNRAS/437/1828 : ExoMol line list for HCN and HNC (Barber+, 2014)J/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)J/MNRAS/442/1821 : ExoMol line list for NaCl and KCl (Barton+, 2014)Table 13: Equilibrium constants for ^12^CHNotes:a: Constants taken from Kalemos et al. (1999, Journal of Chemicalb: Constants taken from Lie et al. (1973, J. Chem. Phys., 59, 1887).c: value fixed according to Lie et al. (1973, J. Chem. Phys., 59, 1887)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/571/A47https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/571/A47http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/571/A47https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/571/A47https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/571/A47http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/571/A47GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/571/A47/table14Linelist of the CH moleculerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlam.Air[2554/33376282] Wavelength of the transition in air ({AA})0.1nmem.wldoublegf? Oscillator strength valuephys.atmol.oscStrengthdoublenullableElow[14/33902] Energy of the lower levelcm**-1phys.energy;phys.atmol.leveldoublevl[0/6] Vibrational quantum number of lower levelphys.atmol.qn;phys.mol.vibrationintJ[0.5/49.5] Rotational angular momentum quantum number of the lower levelphys.atmol.qn;phys.mol.rotationfloatNl[0/49] Rotational angular momentum number of the lower levelphys.atmol.qnintsyml[e/f] Symmetry of the lower levelphys.atmol.qncharEup[2738/57430] Energy of the upper levelcm**-1phys.energy;phys.atmol.leveldoublevu[0/5] Vibrational quantum number of upper levelphys.atmol.qn;phys.mol.vibrationintJu[0.5/49.5] Rotational angular momentum number of the upper levelmeta.id;meta.mainfloatNu[0/49] Rotational angular momentum number of the upper levelphys.atmol.qnintsymu[e/f] Symmetry of the upper levelphys.atmol.qnchargamradRadiative broadening values**-1spect.line.broaddoublemolMolecule: 12CH or 13CHmeta.notechartransElectronic states of the transitionphys.energy;phys.atmol.transitioncharbranchBranch of the transition (P,Q or R)phys.atmol.qncharo-c[-1.7/1.3] Difference between measurement and calculationcm**-1stat.fit.residualdoubleRefReference of the measurement and comments (1)meta.ref;pos.framechar