Abstract
Following pioneering work in the 1960’s and 70’s, many efforts have been made to find the cosmologically and astrophysically significant parameters Y P and dY/dZ as precisely as possible by observing emission lines in extragalactic HII regions. With the accumulation of improved data, several controversial issues have arisen and observational limits on Y P and dY/dZ may have widened somewhat. New, accurate parallaxes from the HIPPARCOS satellite promise to revive interest in estimating Y P and dY/dZ from main-sequence stars with differing metallicities, but even HIPPARCOS parallaxes will be marginal for fitting extreme subdwarfs.
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Pagel, B.E.J. (1995). Helium in HII Regions and Stars. In: Crane, P. (eds) The Light Element Abundances. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49169-9_23
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