422 citations · 4.4k across the 64 of their papers we have counts for
4 papers · 2 filters
Galactic chemical evolution: the observational side
Andrew McWilliam
In this review I outline some ideas in chemical evolution, necessary for understanding the evolution of galaxies from measured elemental abundance ratios. I then discuss abundance…
Two Red Clumps and the X-Shaped Milky Way Bulge
Andrew McWilliam, Manuela Zoccali
From 2MASS infra-red photometry we find two red clump (RC) populations co-existing in the same fields toward the Galactic bulge at latitudes |b|>5.5 deg., ranging over ~13 degrees…
A differential chemical abundance scale for the globular cluster M5
Andreas Koch, Andrew McWilliam
We present LTE chemical abundances for five red giants and one AGB star in the Galactic globular cluster (GC) M5 based on high resolution spectroscopy using the MIKE spectrograph o…
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: Leo IV
Joshua D. Simon, Anna Frebel, Andrew McWilliam +2
We present high-resolution Magellan/MIKE spectroscopy of the brightest star in the ultra-faint dwarf galaxy Leo IV. We measure an iron abundance of [Fe/H] = -3.2, adding to the rap…