413 citations
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Showing 2013Show all
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astro-ph.CO2013★ 146 cited
The primordial helium abundance from updated emissivities
Erik Aver, Keith A. Olive, R. L. Porter +1
Observations of metal-poor extragalactic H II regions allow the determination of the primordial helium abundance, Y_p. The He I emissivities are the foundation of the model of the…
astro-ph.CO2013★ 147 cited
ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. III. An Extremely Metal Deficient Galaxy
Evan D. Skillman, John J. Salzer, Danielle A. Berg +10
We present KPNO 4-m and LBT/MODS spectroscopic observations of an HII region in the nearby dwarf irregular galaxy Leo P discovered recently in the Arecibo ALFALFA survey. In both o…