53 citations · 75 across the 4 of their papers we have counts for
9 papers · 1 filter
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
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…
Temperature Scale and Iron Abundances of Very Hot Central Stars of Planetary Nebulae
K. Werner, J. L. Deetjen, S. Dreizler +2
The determination of effective temperatures of very hot central stars (Teff>70000K) by model atmosphere analyses of optical H and He line profiles is afflicted with considerable un…
Non-LTE effects in neutron star atmospheres
K. Werner, J. Deetjen
We present the first non-LTE model atmospheres for neutron stars (NS). We study their structure and NLTE effects on the emergent thermal radiation of old isolated NS.