Breaking News: Another Binary Neutron Star Merger!

• LIGO/Virgo detection of S190425z
• follow the followup frenzy: GCN

The r-Process

• presence in solar matter: s-process residuals
• basic physics
• paths on chart of the nuclides here and here, animated here
• encoding in solar abundances versus A and versus N
• characteristic scales

Stellar Abundance Clues to the r-Process Site

• r-rich halo stars and universality(?)
• examples: CS22892-052, other halo stars
• dwarf galaxies: Reticulum II (Ji+ 2016)