Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.0601b&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #06.01; Bulletin of the American Astronomical Society, Vol. 32, p.684
Astronomy and Astrophysics
Astronomy
Scientific paper
The primordial abundance of helium and its subsequent production in stars are primarily determined from recombination lines in HII Regions. Accuracies better than a percent must be obtained to make definitive tests of the Big Bang. We report first results of a reinvestigation of the formation of helium recombination lines. Our work builds on previous studies by improving the physical treatment of radiative recombination and the subsequent cascades. We explicitly take fine structure into account by basing our transition rates on the results of Drake [Phys. Rev. A 46, 2378 (1992)]. Previous methodologies were largely based on variational calculations that did not include magnetic and relativistic interactions, thus entailing an unknown degree of inaccuracy. Comparisons with previous calculations are presented along with an assessment of the remaining major uncertainties. This work was supported in part by NSF and NASA.
Bauman Robert P.
Ferland Gary J.
MacAdam K. B.
No associations
LandOfFree
He/H for Cosmology Accurate He recombination coefficients with fine structure does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with He/H for Cosmology Accurate He recombination coefficients with fine structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and He/H for Cosmology Accurate He recombination coefficients with fine structure will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1123125