科研之友
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摘要
We describe a method for determining the primordial helium abundance (Y (p)) from radio recombination lines and present results of the first stage of our measurements. We analyze the observational data for hydrogen and helium radio recombination lines from six Galactic H II regions obtained at different times. We have found Y (p) = 25.2-25.5% with an error of +/- 0.9% from four sources.
- 出版日期2009-10
