Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-14
Astrophys.J.646:691-695,2006
Astronomy and Astrophysics
Astrophysics
12 pages, 3 figures, misplaced figures are corrected, typos in Table1 are corrected
Scientific paper
10.1086/505109
A reanalysis is made for the helium abundance determination for the Izotov-Thuan (2004) spectroscopic sample of extragalactic H II regions. We find that the effect of underlying stellar absorption of the He I lines, which is more important for metal poor systems, affects significantly the inferred primordial helium abundance $Y_p$ obtained in the zero metallicity limit and the slope of linear extrapolation, $dY/dZ$. This brings $Y_p$ from $0.234\pm0.004$ to $0.250\pm 0.004$ and $dY/dZ=4.7\pm 1.0$ to $1.1\pm 1.4$. Conservatively, this indicates the importance of the proper understanding of underlying stellar absorption for accurate determinations of the primordial helium abundance to the error of $\delta Y_p\simeq 0.002-0.004$.
Fukugita Masataka
Kawasaki Masahiro
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