https://iac.es/es/ciencia-y-tecnologia/publicaciones/binarity-and-abundance-discrepancy-problem-planetary-nebulae
Binarity and the Abundance Discrepancy Problem in Planetary Nebulae | Instituto de Astrofísica de...
The discrepancy between abundances computed using optical recombination lines and collisionally excited lines is a major unresolved problem in nebular...
discrepancy problemplanetary nebulaebinarityabundanceinstituto