Discovery of Iron in PG1159 Stars

Details Discovery of Iron in PG1159 Stars Discovery of Iron in PG1159 Stars

2010-12-23

arxiv.org/abs/1012.5228v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17th European White Dwarf Workshop, AIP Conf. Proc, 1273, 75

Scientific paper

The lack of FeVII lines in PG1159 stars had led to the conclusion that in some objects iron must be strongly depleted. We have now detected FeX lines in FUSE spectra of the very hottest PG1159 stars Teff=150,000 - 200,000 K; RXJ2117.1+3412, K1-16, NGC 246, Longmore 4). Surprisingly, we derive a solar iron abundance. It is conspicuous that they are among the most massive PG1159 stars (0.71-0.82 Msun), in contrast to those objects for which strongest Fe-deficiency was claimed (0.53-0.56 Msun). Based on new FeVIII line identifications in SOHO/SUMER UV spectra of the Sun, we were able to detect these lines in FUSE spectra of several "cooler" (Teff<150,000 K) objects, among them is the prototype PG1159-035. An abundance analysis is in progress.

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