High resolution spectroscopy of six new extreme helium starsHigh resolution spectra of six newly discovered extreme helium stars are presented. LSS 5121 is shown to be a spectroscopical twin of the hot extreme helium star HD 160641. A preliminary LTE analysis of LSS 3184 yielded an effective temperature of 22,000 K and a surface gravity of log g = 3.2. Four stars form a new subgroup, classified by sharp-lined He I spectra and pronounced O II spectra, and it is conjectured that these lie close to the Eddington limit. The whole group of extreme helium stars apparently is inhomogeneous with respect to luminosity to mass ratio and chemical composition.
Heber, U. (Kiel Univ. Germany)
Jones, G. (Kiel, Universitaet Institut fuer theoretische Physik und Sternwarte, Germany)
Drilling, J. S. (Louisiana State University Baton Rouge, United States)