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

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

2004-10-28

arxiv.org/abs/astro-ph/0410691v1

Astron.Astrophys. 424 (2004) 657-663

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in "White Dwarfs", eds. D. Koester, S. Moehler, ASP Conf. Series

Scientific paper

10.1051/0004-6361:20041157

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 (Teff=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.

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