Abstract
Calculations show that in old halo B stars most helium will have diffused below the photosphere and therefore will not be detected spectroscopically. This may account for the low abundances of helium observed in these stars.
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GREENSTEIN, G., TRURAN, J. & CAMERON, A. Helium Deficiency in Old Halo B Stars. Nature 213, 871–873 (1967). https://doi.org/10.1038/213871a0
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DOI: https://doi.org/10.1038/213871a0
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