Narrow ultraviolet absorption lines of nova CYG 1978.

Abstract

The narrow Fe II and Mn II absorption lines observed by the IUE satellite have been studied by the curve-of-growth method. Data on the line of sight column densities, including the Fe II/Mn II and the nonexcited Fe II/slightly excited Fe II ratios, have been obtained. It is shown that the line wavelength shifts and the physical characteristics of the line formation region studied are more easily understood if assumed to be circumstellar rather than interstellar.