K I 7699 Å and related shell lines during the recent eclipse of $\epsilon$ Aurigae

C. Muthumariappan, M. Parthasarathy, R. Leadbeater +3

We report high-resolution (R = 30\ 000, 45\ 000 and 75\ 000) echelle and medium-resolution (R = 22\ 000 and 10\ 000) spectroscopic observations of the long-period, eclipsing binary…