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

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Abstract

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 n e in the He+ region, optical depth τ 3889 in the HeI λ3889 Å line, and coefficient of underlying stellar absorption a HeI 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: Y p = 0.244 ± 0.004 and dY/dZ = 8.8 ± 4.6.

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Authors and Affiliations

  1. Ivan Franko L’vov National University, ul. Kyryla i Mefodiya 8, L’vov, 79005, Ukraine

    V. V. Holovatyi (Chair of Astrophysics) & B. Ya. Melekh (Chair of Astrophysics)

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  1. V. V. Holovatyi
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  2. B. Ya. Melekh
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Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 82, No. 9, 2005, pp. 755–762.

Original Russian Text Copyright © 2005 by Holovatyi, Melekh.

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Holovatyi, V.V., Melekh, B.Y. Redetermination of the helium abundances in HII regions in Blue Compact Dwarf Galaxies. Astron. Rep. 49, 671–677 (2005). https://doi.org/10.1134/1.2045317

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  • DOI: https://doi.org/10.1134/1.2045317

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