/ftp/cats/6/150



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VI/150         Recombination coefficients for O II lines - SSB2 (Storey+, 2017)
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VI/150
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Beginning of ReadMe : VI/150 Recombination coefficients for O II lines - SSB2 (Storey+, 2017) ================================================================================ Recombination coefficients for O II lines in nebular conditions. Storey P.J., Sochi T., Bastin R. <Mon. Not. R. Astron. Soc., 470, 379-389> =2017MNRAS.470..379S =2017yCat.6150....0S ================================================================================ ADC_Keywords: Atomic physics Keywords: atomic data - atomic processes - radiation mechanisms - planetary nebulae - H II regions - astrochemistry - plasmas - numerical methods - oxygen - recombination lines - emission coefficients - recombination coefficients Abstract: We present the results of a calculation of recombination coefficientscients for O^2 + ^+e^-^ using an intermediate coupling treatment that fully accounts for the dependence of the distribution of population among the ground levels of O^2+^ on electron density and temperature. The calculation is extended down to low electron temperatures where dielectronic recombination arising from Rydberg states converging on the O^2+^ ground levels is an important process. The data, which consist of emission coefficientscients for 8889 recombination lines and recombination coefficientscients for the ground and metastable states of O^+^ are in Cases A, B and C, and are organised as a function of the electron temperature and number density, as well as wavelength. An interactive fortran 77 data server is also provided as an accessory for mining the line emission coefficients and obtaining Lagrange interpolated values for any choice of the two variables between the explicitly provided values for any set of wavelengths. Some illustrations of the application of the new data to nebular observations are also provided. Description: The list presents emission and recombination coefficients of the O II transitions arising from recombination of doubly-ionised oxygen O^2+^ with a free electron. An intermediate coupling treatment that fully accounts for the dependence of the distribution of population among the ground levels of O^2+^ on electron temperature (Te) and electron number density (Ne) is used. The calculation is extended down to low electron temperatures where dielectronic recombination arising from Rydberg states converging on the O^2+^ ground levels is an important process. The data are given as function of Te and Ne in three Cases (A, B and C). The data are suitable in particular for the physical conditions found in planetary nebulae and HII regions. An interactive data server in the form of fortran 77 code is also provided as an accessory for mining the data of emission coefficients and obtaining Lagrange interpolated values for any choice of the two variables, Te and Ne, between the explicitly provided values for any set of wavelengths and for any Case.