Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-12
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, to appear in "White Dwarfs", eds. D. Koester, S. Moehler, ASP Conf. Series
Scientific paper
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-shell flash that had occurred during their first descent from the AGB. The lack of hydrogen is caused by flash-induced envelope mixing and burning of H in deeper regions. Now the former intershell matter is seen on the surface of the stars. Hence the stellar atmospheres show metal abundances drastically different from the solar values. Our sample comprises ten PG1159 stars with effective temperatures between 85000 K and 170000 K. We present first results of our spectral analysis based on FUV spectra obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE).
Kruk Jeff W.
Rauch Thomas
Reiff Elke
Werner Kirstin
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