22 citations · 27 across the 21 of their papers we have counts for
8 papers · 1 filter
The Rotational Velocity of Helium-rich Pre-White Dwarfs
T. Rauch, S. Koeper, S. Dreizler +3
Previous investigations on hydrogen-rich white dwarfs generally yield only very small rotational velocities (v_rot sin i). We have analyzed line profiles in high-resolution optical…
The Enigma of AA Dor
T. Rauch, K. Werner
AA Dor (LB 3459) is an eclipsing, close binary (P = 0.26d) consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass. The secondary is possibly a f…
Model Photospheres with Accelerated Lambda Iteration
K. Werner, J. L. Deetjen, S. Dreizler +3
We address the classical stellar-atmosphere problem and describe our method of numerical solution in detail. The problem consists of the solution of the radiation transfer equation…
Metal abundances in PG1159 stars from Chandra and FUSE spectroscopy
K. Werner, J. L. Deetjen, S. Dreizler +3
We investigate FUSE spectra of three PG1159 stars and do not find any evidence for iron lines. From a comparison with NLTE models we conclude a deficiency of 1-1.5 dex. We speculat…
Stellar Atmosphere and Accretion Disk Models for the Hot Component in Symbiotic Stars
K. Werner, J. L. Deetjen, S. Dreizler +2
We describe our NLTE codes which allow the computation of synthetic spectra of hot stars and accretion disks. They can be combined to compute ionizing fluxes from the hot component…
H1504+65 - The Naked Stellar C/O Core of a Former Red Giant Observed with FUSE and Chandra
K. Werner, T. Rauch, M. A. Barstow +1
H1504+65 is an extremely hot hydrogen-deficient white dwarf with an effective temperature close to 200,000 K. We present new FUV and soft X-ray spectra obtained with FUSE and Chand…