An improved method to measure ${}^{12}\mathrm{C}{/}^{13}\mathrm{C}$ and ${}^{14}\mathrm{N}{/}^{15}\mathrm{N}$ abundance ratios: revisiting CN isotopologues in the Galactic outer disk

Yichen Sun, Zhi-Yu Zhang, Junzhi Wang +7

The variations of elemental abundance and their ratios along the Galactocentric radius result from the chemical evolution of the Milky Way disks. The ${}^{12}\mathrm{C}{/}^{13}\mathrm{C}$ ratio in p…