White dwarf mergers and the origin of R Coronae Borealis stars
  We present a nucleosynthesis study of the merger of a 0.4 solar masses helium white dwarf with a 0.8 solar masses carbon-oxygen white dwarf, coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen and fluorine, is in qualitative agreement with the observed abundances in R Coronae Borealis stars. 
P. Lor\'en-Aguilar, R. Longland, J. Jos\'e, E. Garc\'ia-Berro, L.G.   Althaus, J. Isern
astro-ph.HE astro-ph.SR