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Metal Abundances in Hot DA White Dwarfs
S. Schuh, M. A. Barstow, S. Dreizler
We compare measured element abundances in hot DA white dwarfs from UV observations to predictions from our self-consistent non-LTE model atmosphere diffusion calculations.
Discovery of a Long-Period Photometric Variation in the V361 Hya Star HS 0702+6043
S. Schuh, J. Huber, E. M. Green +4
We report the discovery of a long-period g-mode oscillation in the previously known short-period p-mode sdB pulsator HS 0702+6043. This makes this star an extraordinary object, uni…
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…
Whole Earth Telescope observations of BPM 37093: a seismological test of crystallization theory in white dwarfs
A. Kanaan, A. Nitta, D. E. Winget +3
BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (~ 1.1 M_sun) to theoretically crystallize while still inside the ZZ Ceti instabilit…
On Possible Oxygen/Neon White Dwarfs: H1504+65 and the White Dwarf Donors in Ultracompact X-ray Binaries
K. Werner, N. J. Hammer, T. Nagel +2
We discuss the possibility to detect O/Ne white dwarfs by evidence for Ne overabundances. The hottest known WD, H1504+65, could be the only single WD for which we might be able to…