Theoretical He I Emissivities in the Case B Approximation
Astrophysics
2009-11-10 v1
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.
Keywords
Cite
@article{arxiv.astro-ph/0502224,
title = {Theoretical He I Emissivities in the Case B Approximation},
author = {R. L. Porter and R. P. Bauman and G. J. Ferland and K. B. MacAdam},
journal= {arXiv preprint arXiv:astro-ph/0502224},
year = {2009}
}
Comments
Accepted to ApJL