Publications (12)
High-resolution ultraviolet spectroscopy of PG1159-035 with HST and FUSE
D. Jahn, T. Rauch, E. Reiff +3
PG1159-035 is the prototype of the PG1159 spectral class which consists of extremely hot hydrogen-deficient (pre-) white dwarfs. It is also the prototype of the GW Vir variables, w…
UV and FUV spectroscopy of the hybrid PG 1159-type central star NGC 7094
M. Ziegler, T. Rauch, E. Reiff +3
Previous studies aiming at the iron-abundance determination in three PG 1159 stars (K 1-16, PG 1159-035, NGC 7094) and a [WC]-PG 1159 transition star (Abell 78) have revealed that…
A new period determination for the close PG1159 binary SDSSJ212531.92-010745.9
S. Schuh, I. Traulsen, T. Nagel +6
Methods to measure masses of PG1159 stars in order to test evolutionary scenarios are currently based on spectroscopic masses or asteroseismological mass determinations. One recent…
AGB star intershell abundances inferred from analyses of extremely hot H-deficient post-AGB stars
K. Werner, D. Jahn, T. Rauch +3
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…
FUSE spectroscopy of PG1159 Stars
E. Reiff, T. Rauch, K. Werner +1
PG1159 stars are hot hydrogen-deficient post-AGB stars with effective temperatures within a range from 75000 K up to 200000 K. These stars are probably the result of a late helium-…
Light and heavy metal abundances in hot central stars of planetary nebulae
K. Werner, A. I. D. Hoffmann, D. Jahn +5
We present new results from our spectral analyses of very hot central stars achieved since the last IAU Symposium on planetary nebulae held in Canberra 2001. The analyses are mainl…
2006 Whole Earth Telescope Observations of GD358: A New Look at the Prototype DBV
J. L. Provencal, M. H. Montgomery, A. Kanaan +53
We report on the analysis of 436.1 hrs of nearly continuous high-speed photometry on the pulsating DB white dwarf GD358 acquired with the Whole Earth Telescope (WET) during the 200…
O(He) Stars
T. Rauch, E. Reiff, K. Werner +1
Spectral analyses of H-deficient post-AGB stars have shown that a small group of four extremely hot objects exists which have almost pure He absorption-line spectra in the optical.…
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…
Search For Iron, Nickel, and Fluorine in PG1159 Stars
E. Reiff, T. Rauch, K. Werner +2
A possible origin of the iron-deficiency in PG1159 stars could be neutron captures on Fe nuclei. A nickel overabundance would corroborate this idea. Consequently we are looking for…
Identification of neon in FUSE and VLT spectra of extremely hot hydrogen-deficient (pre-) white dwarfs
K. Werner, T. Rauch, E. Reiff +2
One of the strongest absorption lines observed in far-ultraviolet FUSE spectra of many PG1159 stars remained unidentified up to now. We show that this line, located at 973.3A, stem…
NLTE spectral analysis of GW Vir pulsators
E. Reiff, D. Jahn, T. Rauch +3
GW Vir variables are the pulsating members in the spectroscopic class of PG 1159 stars. In order to understand the characteristic differences between pulsating and non-pulsating PG…