Determination of the primordial helium abundance from radio recombination line observations |
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| Authors: | A P Tsivilev |
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| Institution: | (1) NARO, National Radio Astronomy Observatory Tucson, 949 North Cherry Avenue, Tucson, AZ 857521-0655, USA;(2) Russian Academy of Sciences, P.N. Lebedev Physical Institute, Laninsky Prospect 53, Moskva, 119991, Russia |
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| Abstract: | 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. |
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