Triple-alphs burning products on the surface of peculiar post-AGB stars
K. Werner1, S.Dreizler2, U.Heber2, T.Rauch11Institut für Theoretische Physik und Sternwarte der Universität Kiel, Germany
2Sternwarte Bamberg, Universität Erlangen-Nürnberg, Germany
The most extreme object is H 1504+65 which is one of the brightest X-ray sources in the sky and the hottest star ever analyzed with model atmosphere techniques ( Teff=170000 K). The photosphere is devoid of hydrogen and helium and composed of oxygen and carbon by equal amounts! This means that we look at the naked core of the former Red Giant. This gives us the unique possibility to confine empirically the still uncertainly known 12C( alpha , gamma) 16O nuclear reaction rate.
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