Identification of a DO White Dwarf and a PG1159 Star in the ESO SN Ia Progenitor Survey (SPY)
arXiv:astro-ph/0410691 · doi:10.1051/0004-6361:20041157
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 (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.
arXiv comment4 pages, to appear in "White Dwarfs", eds. D. Koester, S. Moehler, ASP Conf. Series
References in corpus (4)
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