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2020

Improving Helium Abundance Determinations with Leo P as a Case Study

Aver, Erik, Berg, Danielle A., Olive, Keith A. et al.

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Currently, the primordial helium abundance is best estimated through spectroscopic observations of H II regions in metal-poor galaxies.

However these determinations are limited by several systematic uncertainties which ultimately limit our ability to accurately ascertain the primordial abundance.
In this study, we improve the methodologies for solving for the reddening, the emission contributions from collisional excitation of the H I atoms, the effects underlying absorption in the H I and He I emission lines, and the treatment of the blended H I and He I emission at $\lambda$3889 with the aim of lowering the systematic uncertainties in helium abundance determinations.
To apply these methods, we have obtained observations of the He I $\lambda$10830 emission line in the brightest H II region in the extremely metal-poor (3$\%$ Z$_{\odot}$) galaxy Leo P with the LUCI1 instrument on the LBT.

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