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Title:
Theoretical He I Emissivities in the Case B Approximation
Authors:
Porter, R. L.; Bauman, R. P.; Ferland, G. J.; MacAdam, K. B.
Affiliation:
AA(Department of Physics and Astronomy, University of Kentucky, 177 Chemistry/Physics Building, Lexington, KY 40506 ), AB(Department of Physics and Astronomy, University of Kentucky, 177 Chemistry/Physics Building, Lexington, KY 40506 ), AC(Department of Physics and Astronomy, University of Kentucky, 177 Chemistry/Physics Building, Lexington, KY 40506 ), AD(Department of Physics and Astronomy, University of Kentucky, 177 Chemistry/Physics Building, Lexington, KY 40506 )
Publication:
The Astrophysical Journal, Volume 622, Issue 1, pp. L73-L75. (ApJL Homepage)
Publication Date:
03/2005
Origin:
UCP
Astronomy Keywords:
Atomic Data, Atomic Processes, ISM: Atoms, ISM: Clouds, Plasmas
DOI:
10.1086/429370
Bibliographic Code:
2005ApJ...622L..73P

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.
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