J/A+A/679/A116ivo://CDS.VizieR/J/A+A/679/A116doi:10.26093/cds/vizier/bc-n7/lbbgCDSCrozet P.Morin J.Ross A.J.Bellotti S.Donati J.-F.Fouque P.,Moutou C.Petit P.Carmona A.Kospal A.Adam A.G.Tokaryk D.W.2026-07-01T14:01:10Z2023-11-22T10:03:33ZCDS support team

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

cds-question@unistra.fratomic-physicsspectroscopym-starsMolecular bands of metal oxides and hydrides dominate the optical and near-infrared spectra of M dwarfs. High-resolution spectra of these bands have immense potential for determining many properties of these stars, such as effective temperature, surface gravity, elemental abundances, radial velocity, or surface magnetic fields. Techniques are being developed to do this but remain limited by the current availability and accuracy of molecular data and spectral line lists. This paper reports metal monohydride line lists selected from near-infrared and visible laboratory data to show that specific bands in several electronic transitions can be used to identify CrH, NiH, and FeH in M stars and to determine radial velocities from Doppler shifts. The possibility of measuring magnetic fields is also investigated for FeH and CrH. We used systematic cross-correlation analysis between unpolarised spectra from a selection of M stars and state-specific laboratory line lists. These lists were generated from a combination of existing data and new laboratory laser-excitation spectra recorded at Doppler-limited resolution, in zero-field conditions or in magnetic fields up to 0.6 tesla. We show that transitions at visible wavelengths in FeH and NiH, usually neglected in the analysis of the spectra of M-type stars, do in fact contribute to the spectra, and we demonstrate the influence of magnetic sensitivity on selected transitions in CrH and FeH. Although the new line lists focus on transitions recorded at temperatures significantly lower than those of stellar objects, they remain pertinent because they cover some band-head regions of high spectral density. FeH bands can provide a useful supplement to atomic lines for the analysis of high-resolution optical and near-infrared spectra of M dwarfs. We demonstrate the influence of a magnetic field on CrH signatures around 862nm.2023A&A...679A.116Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/679/A116CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/679/A116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/679/A116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/679/A116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/679/A116https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/679/A116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/679/A116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/679/A116/table1aFeH E ^4^{Pi} - X ^4^{Delta} transitions (around 1.3{mu}m) from NSO archival spectrum of FeH, code 1983/01/19#2, referenced and analysed by Balfour et al. (2004JChPh.121.7735B).recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumber (1)cm**-1em.wavenumberdoublelambdaVacuum wavelengthnmem.wldoubleintRelative intensity (arbitrary unit)spect.line.intensitydoubleJ/A+A/679/A116/table1bFeH E ^4^{Pi} - A ^4^{Pi} transitions (around 1.6{mu}m) from NSO archival spectrum of FeH, code 1983/01/19#2, referenced and analysed by Balfour et al. (2004JChPh.121.7735B)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumber (1)cm**-1em.wavenumberdoublelambdaVacuum wavelengthnmem.wldoubleintRelative intensity (arbitrary unit)spect.line.intensitydoubleJ/A+A/679/A116/table2FeH e ^6^{Pi} - a ^6^{Delta} transitions (around 0.53 {mu}m) from Goodridge et al. (1997JChPh.106.4823G)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumber (1)cm**-1em.wavenumberdoublelambdaVacuum wavelengthnmem.wldoubleJ/A+A/679/A116/table3FeH g ^6^{Phi} - a ^6^{Delta} transitions (around 0.49 {mu}m) from Carter & Brown (1994JChPh.101.2699C) and Wilson et al. (2001JChPh.115.5943W)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table4aCrH A ^6^{Sigma} - X ^6^{Sigma} (0-0) transitions (around 0.86 {mu}m) derived from laser-induced fluorescence spectroscopy performed at ILM in Lyon without imposing an external magnetic fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensitydoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table4bCrH A ^6^{Sigma} - X ^6^{Sigma} (0-0) transitions (around 0.86 {mu}m) computed with the PGopher program described in Western (2017JQSRT.186..221W) for a magnetic field modulus B=0.08TrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensitydoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table4cCrH A ^6^{Sigma} - X ^6^{Sigma} (0-0) transitions (around 0.86 {mu}m) computed with the PGopher program described in Western (2017JQSRT.186..221W) for a magnetic field modulus B=0.345TrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensitydoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table4dCrH A ^6^{Sigma} - X ^6^{Sigma} (0-0) transitions (around 0.86 {mu}m) computed with the PGopher program described in Western (2017JQSRT.186..221W) for a magnetic field modulus B=0.453TrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensitydoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table4eCrH A ^6^{Sigma} - X ^6^{Sigma} (0-0) transitions (around 0.86 {mu}m) computed with the PGopher program described in Western (2017JQSRT.186..221W) for a magnetic field modulus B=0.73TrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumbercm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensitydoublelambdaVacuum wavelength (1)nmem.wldoubleJ/A+A/679/A116/table5aNiH transitions in the spectral window 570-740nm from Vallon et al. (2009ApJ...696..172V), Ross et al. (2012MolPh.110.2019R) and Harker et al. (2013JMoSp.292...28H)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaSpectroscopic wavenumber (1)cm**-1em.wavenumberdoubleintRelative intensity (arbitrary unit)spect.line.intensityfloatlambdaVacuum wavelengthnmem.wldoubleJ/A+A/679/A116/table5bSubset of table 5a restricted to NiH transitions originating from the v=0 and v=1 levels of the X_1_ ^2^{Delta}_5/2_ ground staterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaspectroscopic wavenumbercm**-1em.wavenumberdoublelambdavacuum wavelengthnmem.wldoubleJ/A+A/679/A116/table5cSubset of table 5a restricted to NiH transitions originating from the v=0 level of the X_2_ ^2^{Delta}_3/2_ staterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaspectroscopic wavenumbercm**-1em.wavenumberdoublelambdavacuum wavelengthnmem.wldouble