123 citations · 718 across the 76 of their papers we have counts for
10 papers · 2 filters
KPD0005+5106: Hottest DO White Dwarf Much Hotter Than Assumed
K. Werner, T. Rauch, J. W. Kruk
KPD0005+5106 is the hottest known helium-rich white dwarf. We have identified NeVIII lines in UV and optical spectra and conclude that it is significantly hotter than previously th…
Elemental Abundances in PG1159 Stars
K. Werner, T. Rauch, E. Reiff +1
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB final thermal pulse that consumes t…
FUV Spectroscopy of the sdOB Primary of the Eclipsing Binary System AA Dor
Johannes Fleig, Thomas Rauch, Klaus Werner +1
AA Dor is an eclipsing, close, post common-envelope binary (PCEB). We present a detailed spectral analysis of its sdOB primary star based on observations obtained with the Far Ultr…
Spectral Analysis of Central Stars of Planetary Nebulae
Thomas Rauch, Klaus Werner, Marc Ziegler +2
Spectral analysis by means of NLTE model atmospheres has presently arrived at a high level of sophistication. High-resolution spectra of central stars of planetary nebulae can be r…
High-resolution FUSE and HST ultraviolet spectroscopy of the white dwarf central star of Sh 2-216
T. Rauch, M. Ziegler, K. Werner +5
LS V +4621 is the DAO-type central star of the planetary nebula Sh 2-216. We perform a comprehensive spectral analysis of high-resolution, high-S/N ultraviolet observations obtaine…
HST Spectroscopy of the Hottest White Dwarfs
Thomas Rauch, Klaus Werner
Spectral analysis needs the observation of lines of successive ionization stages in order to evaluate the ionization equilibrium (of a particular species) which is a sensitive indi…