Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-02
Astron.Astrophys.419:1111-1122,2004
Astronomy and Astrophysics
Astrophysics
13 pages, 17 figures, submitted to A&A
Scientific paper
10.1051/0004-6361:20034040
We present a new model atmosphere analysis of nine central stars of planetary nebulae. This study is based on a new generation of realistic stellar model atmospheres for hot stars; state-of-the-art, hydrodynamically consistent, spherically symmetric model atmospheres that have been shown to correctly reproduce the observed UV spectra of massive Population I O-type stars. The information provided by the wind features (terminal velocity, mass loss rate) permits to derive the physical size of each central star, from which we can derive the stellar luminosity, mass and distance, without having to assume a relation between stellar mass and luminosity taken from the theory of stellar structure and AGB and post-AGB evolution. The results of our analysis are quite surprising: we find severe departures from the generally accepted relation between post-AGB central star mass and luminosity.
Hoffmann T. L.
Mendez Roberto H.
Pauldrach Adalbert W. A.
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