Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-10
Proceedings of the XXXVIIth Rencontres de Moriond: 'The cosmological model', eds. Y. Giraud-H\'eraud, C. Magneville, J. Tran T
Astronomy and Astrophysics
Astrophysics
8 pages, 1 figure. Moriond Latex style. To be published in the proceedings of the XXXVIIth Moriond Astrophysics Meeting "The C
Scientific paper
The primordial abundance of 4He, Y_P, is one of the hottest themes in present-day astronomy, mostly due to its cosmological relevance. The disagreement between different determinations has been currently reduced to the 1-2 percent level, but these differences are still large enough to have deep implications for Big-Bang nucleosynthesis. It is therefore crucial to estimate precisely the uncertainties involved in the measurement of Y_P. Here, I review the methods used in the determination of Y_P and the related uncertainties. I also discuss some recent results, and emphasize the assumptions underlying the differences among them.
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