22 citations · 40 across the 22 of their papers we have counts for
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Fluorine in extremely hot post-AGB stars
K. Werner, T. Rauch, J. W. Kruk
We have discovered lines of highly ionized fluorine (Fv and Fvi) in the far-UV spectra of extremely hot (Teff=85,000--150,000 K) post-AGB stars. Our sample comprises H-rich central…
Iron Abundance in Hydrogen-Rich Central Stars of Planetary Nebulae
A. I. D. Hoffmann, I. Traulsen, T. Rauch +3
We report on an on-going analysis of high-resolution UV spectra of hot hydrogen-rich central stars of planetary nebulae (CSPN), obtained with the Hubble Space Telescope and FUSE. S…
HST and FUSE Spectroscopy of Hot Hydrogen-Rich Central Stars of Planetary Nebulae
I. Traulsen, A. I. D. Hoffmann, T. Rauch +3
High-resolution UV spectra, obtained with HST and FUSE, enable us to analyse hot hydrogen-rich central stars in detail. Up to now, optical hydrogen and helium lines have been used…
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-…
Turning cool star X-ray spectra upside down
K. Werner, J. J. Drake
H1504+65 is a young white dwarf with an effective temperature of 200,000 K and is the hottest post-AGB star ever analysed with detailed model atmospheres. Chandra LETG+HRC-S spectr…
On the Evolutionary Status of Extremely Hot Helium Stars - are O(He) Stars Successors of RCrB Stars?
Thomas Rauch, Elke Reiff, Klaus Werner +3
95% of all stars end their lives as white dwarfs. About 20% of the hot post-AGB stars are hydrogen deficient. Most of these are the result of a late helium-shell flash, but the evo…