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Abteilung Astronomie

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Preprint 09j/10

Metal Abundances in the Hottest Known DO White Dwarf (KPD0005+5106)

Daniel Wassermann (1), Klaus Werner (1), Thomas Rauch (1) and Jeffrey W. Kruk (2)

1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics,
Eberhard Karls University, D-72076 Tübingen, Germany
2) NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

To be published in: Proceedings of the 17th European White Dwarf Workshop, AIP Conference Series

Abstract. We performed a new analysis of UV and optical spectra of KPD0005+5106. We find Teff = 200000±20000 K, logg= 6.7±0.3, M = 0.64Msun and logL/Lsun = 3.7. The mass fractions of the metals are in the range 0.7 - 4.3 times solar. This abundance pattern is probably unaffected by gravitational settling and radiative levitation, hence, its origin lies in previous evolutionary stages. We speculate about a link of KPD0005+5106 to the RCrB stars and its possible outcome of a double-degeneratemerger event.

Preprint (114 kb PDF file including figures)

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