NeVII: Powerful Wind Diagnostics For Very Hot Stars

Details NeVII: Powerful Wind Diagnostics For Very Hot Stars NeVII: Powerful Wind Diagnostics For Very Hot Stars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718224h&link_type=abstract

American Astronomical Society Meeting 207, #182.24; Bulletin of the American Astronomical Society, Vol. 37, p.1467

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Scientific paper

We have recently 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) as originating from Ne VII. Using stellar atmosphere models, we reproduce this feature as it is observed in hydrogen-deficient CSPN, as well as in PG 1159 objects. The discovery of neon diagnostic features in CSPN spectra is important because an overabundance of this element is indicative 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 hydrogen-deficient CSPN. We explore the potential of this strong feature as well as weaker neon features as diagnostics in stellar atmosphere analyses for extremely hot post-ABG objects (where other diagnostics are scarce).

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