Detection of O VII lambda1522 in IUE Spectra of Planetary Nebula Nuclei and Other Hot Stars

Abstract

We present the first detection of O VII lambda1522 emission or absorption from archival IUE spectra in 14 planetary nebula nuclei and three PG 1159-type stars. The n=5-->6 transition of O VII was determined by Kruk & Werner and observed by them in the spectrum of the very hot PG 1159-type star H1504+65 from data obtained with the Hopkins Ultraviolet Telescope (HUT). Emission-line fluxes or absorption equivalent widths as well as radial velocities for the program stars are presented. The precise rest wavelength for the 5-->6 transition requires further investigation.