Sliding along the Eddington Limit—Heavy-Weight Central Stars of Planetary Nebulae
Abstract
Due to thermal pulses, asymptotic giant branch (AGB) stars experience periods of convective mixing that provide ideal conditions for slow neutron-capture nucleosynthesis. These processes are affected by large uncertainties and are still not fully understood. By the lucky coincidence that about a quarter of all post-AGB stars turn hydrogen-deficient in a final flash of the helium-burning shell, they display nuclear processed material at the surface providing an unique insight to nucleosynthesis and mixing. We present results of non-local thermodynamic equilibrium spectral analyses of the extremely hot, hydrogen-deficient, PG 1159-type central stars of the Skull Nebula NGC 246 and the "Galactic Soccerballs" Abell 43 and NGC 7094.
- Publication:
-
Galaxies
- Pub Date:
- June 2018
- DOI:
- 10.3390/galaxies6020065
- arXiv:
- arXiv:1806.07279
- Bibcode:
- 2018Galax...6...65L
- Keywords:
-
- stars: abundances;
- stars: AGB and post-AGB;
- stars: atmospheres;
- stars: individual: WD 0044–121;
- stars: individual: WD 2134+25;
- stars: individual: WD 1751+106;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 6 pages, 3 figures, APNVII conference proceedings