Redetermination of the helium abundances in HII regions in Blue Compact Dwarf Galaxies

被引：0
|
作者：
V. V. Holovatyi
B. Ya. Melekh
机构：
[1] Ivan Franko L’vov National University,
来源：
Astronomy Reports | 2005年 / 49卷
关键词：
Recombination; Helium; Optical Depth; Electron Number; Electron Number Density;
D O I：
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学科分类号：
摘要：
The He/H abundances in HII regions in Blue Compact Dwarf Galaxies are redetermined using the new recombination coefficients of Benjamin et al. The electron number density ne in the He+ region, optical depth τ3889 in the HeI λ3889 Å line, and coefficient of underlying stellar absorption aHeI are determined using the self-consistent method of Olive and Skillman. The primordial helium abundance and its enrichment are found using the helium abundances obtained in this paper and heavy-element abundances from our recent paper I: Yp = 0.244 ± 0.004 and dY/dZ = 8.8 ± 4.6.
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页码：671 / 677
页数：6
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