On the discovery of K I 7699 A line strength variation during the 1982 - 1984 eclipse of Epsilon Aurigae

TL;DR

This paper reports the discovery of variations in the K I 7699 Å spectral line during the 1982-1984 eclipse of Epsilon Aurigae, providing insights into the eclipse's dynamics through spectral analysis.

Contribution

It presents the first detailed observation of K I 7699 Å line strength variations during Epsilon Aurigae's eclipse, with spectral data spanning from 1981 to 1983.

Findings

Detected significant K I 7699 Å line strength variations during eclipse

Measured radial velocities indicating dynamic changes in the system

Provided spectral data covering pre-eclipse to post-eclipse phases

Abstract

The discovery of K I 7699{\AA} line strength variations during the 1982-1984 eclipse of {\epsilon} Aurigae is described. The equivalent widths and radial velocities of the K I 7699{\AA} line derived from spectra obtained during 1981 November to 1983 July with the 2.1-meter Otto Struve reflector telescope of the McDonald observatory are presented.