Redetermination of the Helium Abundances in HII Regions in Blue Compact Dwarf Galaxies

Details Redetermination of the Helium Abundances in HII Regions in Blue Compact Dwarf Galaxies Redetermination of the Helium Abundances in HII Regions in Blue Compact Dwarf Galaxies

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005arep...49..671h&link_type=abstract

Astronomy Reports, vol. 49, Issue 9, p.671-677

Astronomy and Astrophysics

Astronomy

2

Scientific paper

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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