4 citations · 6 across the 11 of their papers we have counts for
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The LBT Y Project VI: Gas-Phase Chemical Abundance Patterns of Metal-Poor Nebulae
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +7
Through a combined rest-optical and NIR observing campaign, the Large Binocular Telescope Primordial He Abundance () Project has delivered a precision measurement of $Y_…
Constraints on the Galactic Chemical Evolution of
Miqaela K. Weller, David H. Weinberg
We examine the galactic chemical evolution (GCE) of in one-zone and multi-zone models, with particular attention to the stellar yields and GCE parameters that can repro…
The LBT Project III: LUCI Spectra of Metal-Poor Nebulae
Miqaela K. Weller, Richard W. Pogge, Evan D. Skillman +6
Accurately determining the elemental abundances of a low metallicity nebula strongly depends on measuring the density (n) and temperature (T) of the gas. Because these two…
The LBT Project II: MODS Spectra, Physical Conditions, and Oxygen Abundances in Local Metal-Poor Nebulae
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +7
Empirically measuring the primordial He mass fraction, , requires a significant number of low-metallicity nebulae with direct constraints on He/H and O/H abundances. Thi…
Metals versus Non-metals: Chemical Evolution of Hydrogen and Helium Isotopes in the Milky Way
James W. Johnson, Miqaela K. Weller, Ryan J. Cooke
Star formation drives changes in the compositions of galaxies, fusing H and He into heavier nuclei. This paper investigates the differences in abundance evolution between metal and…
The Milky Way Radial Metallicity Gradient as an Equilibrium Phenomenon: Why Old Stars are Metal-Rich
James W. Johnson, David H. Weinberg, Guillermo A. Blanc +12
Metallicities of both gas and stars decline toward large radii in spiral galaxies, a trend known as the radial metallicity gradient. We quantify the evolution of the metallicity gr…
Modeling the Galactic Chemical Evolution of Helium
Miqaela K. Weller, David H. Weinberg, James W. Johnson
We examine the galactic chemical evolution (GCE) of He in one-zone and multi-zone models, with particular attention to theoretical predictions and empirical constraints on IMF-…