IUE Observations of Accretion Columns in Two Zeta Aurigae--Type Systems

Abstract

This paper reports the existence of an accretion column in 32 Cyg. It also confirms the presence of the accretion column in ζ Aur and reports the detection of secular variations. Mg II observations support the parameters derived by Ahmad, Chapman, and Kondo for ζ Aur but suggest that the column may be curved. A C IV and Si IV emission component is seen in ζ Aur but not in 32 Cyg. Resonance line equivalent widths have been calculated and the implications for flow geometry, secular variability, and plasma density are discussed.