${}^{12}$C/${}^{13}$C ratio in planetary nebulae from the IUE archives

R. H. Rubin, G. J. Ferland, E. E. Chollet +1

We investigated the abundance ratio of ${}^{12}$C/${}^{13}$C in planetary nebulae by examining emission lines arising from \ion{C}{3} $2s2p ^3P_{2,1,0} \to 2s^2 ^1S_0$. Spectra were re…