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Preprint 11c/04

Identification of a DO White Dwarf and a PG1159 Star in the ESO SN Ia Progenitor Survey (SPY)

K. Werner (1), T. Rauch (1,2), R. Napiwotzki (3), N. Christlieb (4), D. Reimers (4) and C.A. Karl (2)

1 Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
2 Dr. Remeis-Sternwarte, Sternwartstr. 7, 96049 Bamberg, Germany
3 Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
4 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany

To be published in: 14th European Workshop on White Dwarfs, eds. D. Koester, S. Moehler, ASP Conf. Ser.

Abstract. We present high-resolution VLT spectra of a new DO white dwarf and a new PG1159 star, which we identified in the ESO SPY survey. The PG1159 star is a low-gravity, extremely hot (T_eff=160,000 K, log g=6) star, having a C/He dominated atmosphere with considerable amounts of O and Ne (He=38%, C=54%, O=6%, Ne=2% by mass). It is located within the planetary nebula nuclei instability strip and pulsations have been discovered. The DO is a unique object. From HeI/HeII line strengths we found Teff about 60,000 K, however, the HeII lines are extraordinarily strong and cannot be fitted by any model.
 

Preprint (316 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0410691

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