The Primordial Helium Abundance

Details The Primordial Helium Abundance The Primordial Helium Abundance

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.

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