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- W1993345230 abstract "Existing data on helium, oxygen and nitrogen abundances in HII, blue compact and irregular galaxies are rediscussed paying special attention to objects with noticeable broad emission lines due to Wolf-Rayet stars, in some of which there is reason to suspect temporary and local enhancements of both helium and nitrogen from stellar winds. The resulting estimate of the primordial helium abundance, YP = 0.228 ± 0.005 (s.e.), is unchanged from what has been derived previously, but the dY/dZ slope is still remarkably large, about 4, and in significant disagreement with what had been theoretically predicted for these low-metallicity systems." @default.
- W1993345230 created "2016-06-24" @default.
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- W1993345230 date "1993-05-01" @default.
- W1993345230 modified "2023-09-27" @default.
- W1993345230 title "Primordial and non-primordial helium" @default.
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- W1993345230 doi "https://doi.org/10.1016/0370-1573(93)90070-t" @default.
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