Light and heavy metal abundances in hot central stars of planetary nebulae

Details Light and heavy metal abundances in hot central stars of planetary nebulae Light and heavy metal abundances in hot central stars of planetary nebulae

2005-08-03

arxiv.org/abs/astro-ph/0508108v1

AIP Conf.Proc.804:129-132,2006

Astronomy and Astrophysics

Astrophysics

Conf. proceedings, Gdansk 2005, Planetary Nebulae as astronomical tools, 4 pages, 4 figures

Scientific paper

10.1063/1.2146248

We present new results from our spectral analyses of very hot central stars achieved since the last IAU Symposium on planetary nebulae held in Canberra 2001. The analyses are mainly based on UV and far-UV spectroscopy performed with the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer but also on ground-based observations performed at the Very Large Telescope and other observatories. We report on temperature, gravity, and abundance determinations for the CNO elements of hydrogen-rich central stars. In many hydrogen-deficient central stars (spectral type PG1159) we discovered particular neon and fluorine lines, which are observed for the very first time in any astrophysical object. Their analysis strongly confirms the idea that these stars exhibit intershell matter as a consequence of a late helium-shell flash.

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