On the discovery of K I 7699 Å line strength variation during the 1982–1984 eclipse of ε Aurigae

Abstract

The discovery of K I 7699 Å line strength variations during the 1982–1984 eclipse of ε Aurigae is described. The equivalent widths and radial velocities of the K I 7699 Å line derived from spectra obtained during 1981 November–1983 July with the 2.1 m Otto Struve reflector telescope of the McDonald observatory are presented