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- W2095828052 abstract "We present high-resolution VLT spectra of a new helium-rich DO white dwarf (HE1314+0018) and a new PG 1159 star (HE1429-1209), which we identified in the ESO SPY survey. We performed NLTE model atmosphere analyses and found that the PG 1159 star is a low-gravity, extremely hot ( = 160 000 K, = 6) star, having a carbon-helium dominated atmosphere with considerable amounts of oxygen and neon (He = 38%, C = 54%, O = 6%, Ne = 2% by mass). It is located within the planetary nebula nuclei instability strip, hence, future searches for an associated PN as well as for stellar pulsations might be successful. The DO white dwarf is a unique object. From the relative strength of neutral and ionized helium lines we found ≈ 60 000 K, however, the lines are extraordinarily strong and cannot be fitted by any model. Similar problems were encountered with hot subdwarfs and white dwarfs showing signatures of a super-hot wind. The reason is unknown." @default.
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- W2095828052 date "2004-08-23" @default.
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- W2095828052 title "Identification of a DO white dwarf and a PG 1159 star in the ESO SN Ia progenitor survey (SPY)" @default.
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- W2095828052 doi "https://doi.org/10.1051/0004-6361:20041157" @default.
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