New powerful diagnostics for hot evolved stars: constraining the hottest temperatures, the faintest winds, and the neon abundance

Details New powerful diagnostics for hot evolved stars: constraining the hottest temperatures, the faintest winds, and the neon abundance New powerful diagnostics for hot evolved stars: constraining the hottest temperatures, the faintest winds, and the neon abundance

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf...89b&link_type=abstract

UV Astronomy: Stars from Birth to Death. Proceedings of the Joint Discussion n.4 during the IAU general Assembly of 2006. Ana I.

Astronomy and Astrophysics

Astronomy

2

Uv Spectroscopy, Post-Abg Stars, Planetary Nebulae, Pg1159 Stars, Winds, Neon Abundance, Stellar Evolution

Scientific paper

We have identified a strong P Cygni feature (λ 973) in the far-UV spectra of some very hot (Teff ≥ 85, 000 K) central stars of planetary nebulae (CSPN) and PG 1159 stars as originating from NeVII. Using stellar atmosphere models, we reproduce this feature as it is observed in the spectra of hydrogen-deficient CSPN, as well as in PG 1159 stars. The discovery of highly ionized neon in CSPN spectra is important because an overabundance of this element is indica- tive of processed material that has been dredged up to the surface from the interior region as predicted in the `born-again` scenario, an explanation of H- deficient post-Asymptotic Giant-Branch (AGB) objects. We show the potential of this strong feature as well as weaker neon features as diagnostics in stellar atmospheres analyses for extremely hot post-AGB objects, where other diag- nostics are scarce. This diagnostic is potentially useful also in the analysis of massive stars with winds such as WO stars.

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