More Like this

1. The R -Process Alliance: Discovery of a Low- α , r -process-enhanced Metal-poor Star in the Galactic Halo

   https://doi.org/10.3847/1538-4357/ab0c02  

   Sakari, Charli M. ; Roederer, Ian U. ; Placco, Vinicius M. ; Beers, Timothy C. ; Ezzeddine, Rana ; Frebel, Anna ; Hansen, Terese ; Sneden, Christopher ; Cowan, John J. ; Wallerstein, George ; et al ( April 2019 , The Astrophysical Journal)
2. The R -Process Alliance: Discovery of the First Metal-poor Star with a Combined r - and s -process Element Signature

   https://doi.org/10.3847/1538-4357/aacbc3  

   Gull, Maude ; Frebel, Anna ; Cain, Madelyn G. ; Placco, Vinicius M. ; Ji, Alexander P. ; Abate, Carlo ; Ezzeddine, Rana ; Karakas, Amanda I. ; Hansen, Terese T. ; Sakari, Charli ; et al ( August 2018 , The Astrophysical Journal)
3. The R -Process Alliance: First Release from the Northern Search for r -process-enhanced Metal-poor Stars in the Galactic Halo

   https://doi.org/10.3847/1538-4357/aae9df  

   Sakari, Charli M. ; Placco, Vinicius M. ; Farrell, Elizabeth M. ; Roederer, Ian U. ; Wallerstein, George ; Beers, Timothy C. ; Ezzeddine, Rana ; Frebel, Anna ; Hansen, Terese ; Holmbeck, Erika M. ; et al ( December 2018 , The Astrophysical Journal)
4. Actinide-rich and Actinide-poor r -process-enhanced Metal-poor Stars Do Not Require Separate r -process Progenitors

   https://doi.org/10.3847/1538-4357/ab2a01  

   Holmbeck, Erika M. ; Frebel, Anna ; McLaughlin, G. C. ; Mumpower, Matthew R. ; Sprouse, Trevor M. ; Surman, Rebecca ( August 2019 , The Astrophysical Journal)
5. The R -Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme R -process Enhancement of [Eu/H] = −0.14

   https://doi.org/10.3847/1538-4357/aadd92  

   Roederer, Ian U. ; Sakari, Charli M. ; Placco, Vinicius M. ; Beers, Timothy C. ; Ezzeddine, Rana ; Frebel, Anna ; Hansen, Terese T. ( October 2018 , The Astrophysical Journal)