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Interstellar Deuterium, Nitrogen, and Oxygen Abundances Toward GD 246, WD 2331475, HZ 21, and Lan 23: Results from the FUSE Mission
Cristina M. Oliveira, Guillaume Hebrard, J. Christopher Howk +3
The interstellar abundances of D I, N I, and O I in the local ISM are studied us ing high-resolution spectra of four hot white dwarfs. The spectra of GD 246, WD 2331475, HZ 21,…
FUSE Spectroscopy of the Two Prototype White Dwarfs With Signatures of a Super-hot Wind
K. Werner, S. Dreizler, J. W. Kruk +1
The O VIII phenomenon describes the occurrence of ultra-high ionization absorption lines of the CNO elements (e.g. O VIII, N VII, C VI, and even Ne X) in the optical spectra hot of…
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…
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…
Iron abundance in hot hydrogen-deficient central stars and white dwarfs from FUSE, HST, and IUE spectroscopy
S. Miksa, J. L. Deetjen, S. Dreizler +3
We present a first systematic investigation of the iron abundance in very hot (Teff>50,000K) hydrogen-deficient post-AGB stars. Our sample comprises 16 PG1159 stars and four DO whi…
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…