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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…
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…
FUSE observations of the central star of Abell 78
K. Werner, S. Dreizler, L. Koesterke +1
FUSE high resolution spectra of two PG1159 type central stars (K1-16 and NGC 7094) have revealed an unexpected iron deficiency of at least 1 or 2 dex (Miksa et al. 2002). Here we p…