First Detection of ${}^3$He${}^{+}$ in the Planetary Nebula IC418

L. Guzman-Ramirez, J. R. Rizzo, A. A. Zijlstra +3

The ${}^3$He isotope is important to many fields of astrophysics, including stellar evolution, chemical evolution, and cosmology. The isotope is produced in low-mass stars which evol…