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An extended halo around an ancient dwarf galaxy
Anirudh Chiti, Anna Frebel, Joshua D. Simon +7
The Milky Way is surrounded by dozens of ultra-faint (< solar luminosities) dwarf satellite galaxies. They are the surviving remnants of the earliest galaxies, as confirmed…
Collapsar R-Process Yields Can Reproduce [Eu/Fe] Abundance Scatter in Metal-Poor Stars
Kaley Brauer, Alexander P. Ji, Maria R. Drout +1
It is unclear if neutron star mergers can explain the observed r-process abundances of metal-poor stars. Collapsars, defined here as rotating massive stars whose collapse results i…
The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams
Alexander P. Ji, Ting S. Li, Terese T. Hansen +16
We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliq…
The tidal remnant of an unusually metal-poor globular cluster
Zhen Wan, Geraint F. Lewis, Ting S. Li +18
Globular clusters are some of the oldest bound stellar structures observed in the Universe. They are ubiquitous in large galaxies and are believed to trace intense star formation e…
The Most Metal-poor Stars in the Inner Bulge
Henrique Reggiani, Kevin C. Schlaufman, Andrew R. Casey +1
The bulge is the oldest component of the Milky Way. Since numerous simulations of Milky Way formation have predicted that the oldest stars at a given metallicity are found on tight…
The R-Process Alliance: J1521-3538, a very metal-poor, extremely r-process-enhanced star with [Eu/Fe]=+2.2, and the class of r-III stars
Madelyn Cain, Anna Frebel, Alexander P. Ji +8
We report the discovery of J1521-3538, a bright (V=12.2), very metal-poor ([Fe/H]=-2.8) strongly r-process enhanced field horizontal branch star, based on a high-resolution, high s…