Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1307s&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #13.07; Bulletin of the American Astronomical Society, Vol. 28, p.1290
Astronomy and Astrophysics
Astronomy
Scientific paper
We report progress on observational and theoretical work related to a more accurate determination of the primordial helium abundance. WHT and Calar Alto 3.5m double spectrograph observations of the very low metallicity galaxy SBS 0335-052 are presented. Simultaneous measurement of several helium emission lines with two independent telescope/spectrograph configurations allow us to derive a very accurate helium abundance for this object. We have also carried out a detailed comparison of two atomic data sets (Almog & Netzer 1989; Smits 1996) for calculating the recombination spectrum of helium. This resultant atomic data has been combined with the recently calculated collision strengths of Sawey & Berrington (1993). Differences in the resultant emission line intensities from previous works are illustrated, and the significance for observational studies is discussed.
Benjamin Robert A.
Skillman Evan D.
Terlevich Elena
Terlevich Robert
No associations
LandOfFree
The Primordial Helium Abundance 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 The Primordial Helium Abundance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Primordial Helium Abundance will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-814801