Abstract
WE report here a search for the He109α line from the galactic centre HII region G0.5-0.0. Our failure to detect the line sets an upper limit to the abundance of helium which is about 10% of the abundance found in many HII regions. Our limit of 0.01 for the abundance of helium relative to hydrogen is even lower than the limits of 0.021 and 0.025 recently reported1 for two other galactic centre regions, G0.7-0.0 (Sgr B2) and G0.2-0.0.
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HUCHTMEIER, W., BATCHELOR, R. Anomalous Helium Abundance of the Galactic Centre HII Region G0.5-0.0. Nature 243, 155–156 (1973). https://doi.org/10.1038/243155a0
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DOI: https://doi.org/10.1038/243155a0
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