J/MNRAS/357/471ivo://CDS.VizieR/J/MNRAS/357/471doi:10.26093/cds/vizier.73570471CDSEngel E.A.Doss N.Harris G.J.Tennyson J.2024-06-30T20:17:13Z2005-04-02T22:47:09ZCDS support team

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

cds-question@unistra.fratomic-physicsstellar-atmospheric-opacityradio-astronomyThe wavelength and Einstein A coefficient are calculated for all rotation-vibration transitions of ^4^HeH^+^, ^3^HeH^+^, ^4^He^2^H^+^ and ^3^He^2^H^+^, giving a complete line list and the partition function for ^4^HeH^+^ and its isotopologues. This opacity is included in the calculation of the total opacity of low-metallicity stars and its effect is analysed for different conditions of temperature, density and hydrogen number fraction. For a low helium number fraction (as in the Sun), it is found that HeH^+^ has a visible but small effect for very low densities ({rho}<=10^-10^g/cm^3^), at temperatures around 3500K. However, for high helium number fraction, the effect of HeH^+^ becomes important for higher densities ({rho}<=10^-6^g/cm^3^), its effect being most important for a temperature around 3500K. Synthetic spectra for a variety of different conditions are presented.2005MNRAS.357..471Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/357/471CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/357/471https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/357/471http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/357/471https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/357/471https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/357/471http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/357/471GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/MNRAS/357/471/3hedLine list of ^3^HeD^+^ (Iso = 23)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intLambdaWavelength of the transitionnmdoubleAEinstein A coefficient of the transitions**-1doubleJ'Rotational quantum number of the upper statefloatE'Energy of the upper statecm**-1doubleJ"Rotational quantum number of the lower statefloatE"Energy of the lower statecm**-1doubleV'Vibrational quantum number of the upper stateintV"Vibrational quantum number of the lower stateintIsoNumbers of masses of the atoms of the molecule in the ascending order (23, 13, 24 or 14)intJ/MNRAS/357/471/3hehLine list of ^3^HeH^+^ (Iso = 13)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intLambdaWavelength of the transitionnmdoubleAEinstein A coefficient of the transitions**-1doubleJ'Rotational quantum number of the upper statefloatE'Energy of the upper statecm**-1doubleJ"Rotational quantum number of the lower statefloatE"Energy of the lower statecm**-1doubleV'Vibrational quantum number of the upper stateintV"Vibrational quantum number of the lower stateintIsoNumbers of masses of the atoms of the molecule in the ascending order (23, 13, 24 or 14)intJ/MNRAS/357/471/4hedLine list of ^4^HeD^+^ (Iso = 24)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intLambdaWavelength of the transitionnmdoubleAEinstein A coefficient of the transitions**-1doubleJ'Rotational quantum number of the upper statefloatE'Energy of the upper statecm**-1doubleJ"Rotational quantum number of the lower statefloatE"Energy of the lower statecm**-1doubleV'Vibrational quantum number of the upper stateintV"Vibrational quantum number of the lower stateintIsoNumbers of masses of the atoms of the molecule in the ascending order (23, 13, 24 or 14)intJ/MNRAS/357/471/4hehLine list of ^4^HeH^+^ (Iso = 14)E'Energy of the upper statecm**-1doublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intLambdaWavelength of the transitionnmdoubleAEinstein A coefficient of the transitions**-1doubleJ'Rotational quantum number of the upper statefloatJ"Rotational quantum number of the lower statefloatE"Energy of the lower statecm**-1doubleV'Vibrational quantum number of the upper stateintV"Vibrational quantum number of the lower stateintIsoNumbers of masses of the atoms of the molecule in the ascending order (23, 13, 24 or 14)int