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Galaxies 2018, 6(2), 65; https://doi.org/10.3390/galaxies6020065

Sliding along the Eddington Limit—Heavy-Weight Central Stars of Planetary Nebulae

1
Institute for Astronomy and Astrophysics, Kepler Center for Astro- and Particle Physics, Eberhard Karls University, Astronomy and Astrophysics, Sand 1, D-72076 Tübingen, Germany
2
European Southern Observatory (ESO), Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
Received: 23 April 2018 / Revised: 14 June 2018 / Accepted: 15 June 2018 / Published: 19 June 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
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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. View Full-Text
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 stars: abundances; stars: AGB and post-AGB; stars: atmospheres; stars: individual: WD 0044–121; stars: individual: WD 2134+25; stars: individual: WD 1751+106
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Löbling, L. Sliding along the Eddington Limit—Heavy-Weight Central Stars of Planetary Nebulae. Galaxies 2018, 6, 65.

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