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Theoretical He I Emissivities in the Case B Approximation | R. L. Porter
; R. P. Bauman
; G. J. Ferland
; K. B. MacAdam
; | Date: |
10 Feb 2005 | Journal: | Astrophys.J. 622 (2005) L73 | Subject: | astro-ph | Abstract: | We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects but also on determinations of the primordial helium abundance. | Source: | arXiv, astro-ph/0502224 | Services: | Forum | Review | PDF | Favorites |
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