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Recombination line intensities for hydrogenic ions: The fine-structure components of H I and He II

Clegg, RES; Miller, S; Storey, PJ; Kisielius, R; (1999) Recombination line intensities for hydrogenic ions: The fine-structure components of H I and He II. ASTRON ASTROPHYS SUP , 135 (2) 359 - 370.

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Abstract

Emissivities have been calculated for finestructure components of selected UV and optical recombination lines of HI and He II. Results are given for a range of electron temperatures and densities, and in Cases A and B of Baker & Menzel (1938). Relative intensities, wavelengths and velocity shifts of the fine-structure components are tabulated. Applications to the spectra of gaseous nebulae are discussed. Depending on the temperature, density and Case, the centres of unresolved lines can shift by up to 0.9 km s(-1) for H I and 3.3 km s(-1) for He II. A new calibration of the H alpha-[N II] method for determining electron temperatures is given.

Type:Article
Title:Recombination line intensities for hydrogenic ions: The fine-structure components of H I and He II
Keywords:atomic data, line : formation, line : profiles, H II regions, planetary nebulae : general, CASE-B CALCULATIONS, COEFFICIENTS, SHELL
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Science and Technology Studies

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