Discovery of Iron in PG1159 Stars
Abstract
The lack of Fe VII lines in PG1159 stars had led to the conclusion that in some objects iron must be strongly depleted. We have now detected Fe X lines in FUSE spectra of the very hottest PG1159 stars (Teff = 150 000-200 000 KRX J2117.1+3412, K1-16, NGC 246, Longmore4). Surprisingly, we derive a solar iron abundance. It is conspicuous that they are among the most massive PG1159 stars (0.71-0.82 Msolar), in contrast to those objects for which strongest Fe-deficiency was claimed (0.53-0.56 Msolar). Based on new Fe VIII 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) objects, among them is the prototype PG1159-035. An abundance analysis is in progress.
- Publication:
-
17th European White Dwarf Workshop
- Pub Date:
- November 2010
- DOI:
- 10.1063/1.3527893
- arXiv:
- arXiv:1012.5228
- Bibcode:
- 2010AIPC.1273...75W
- Keywords:
-
- white dwarfs;
- planetary nebulae;
- stellar mass;
- 97.20.Rp;
- 98.38.Am;
- 97.10.Nf;
- Faint blue stars white dwarfs degenerate stars nuclei of planetary nebulae;
- Physical properties;
- Masses;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 17th European White Dwarf Workshop, AIP Conf. Proc, 1273, 75