Abstract
New results of the Primordial Helium abundance (Y p ) measurement by radio recombination line (RRL) observations from five galactic HII regions are presented. The RRL observations were carried out with two telescopes: RT32 (22.4 and 8.3 GHz, Medicina, Italy) and RT22 (36.5 and 22.4 GHz, Pushchino, Russia). The results of the first run of the low frequency RRL observations (408 MHz) with the Croce del Nord radiotelescope (Medicina Observatory, Italy) are also presented.
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Tsivilev, A., Cortiglioni, S., Poppi, S., Montebugnoli, S. (2006). Radio Recombination Line (RRL) Observations: Primordial Helium Determination and First Results at 408 MHz with the Croce del Nord Radiotelescope. In: Randich, S., Pasquini, L. (eds) Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites. ESO ASTROPHYSICS SYMPOSIA. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-34136-9_117
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DOI: https://doi.org/10.1007/978-3-540-34136-9_117
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