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Preprint 10c/00

NLTE Spectral analysis of iron group elements in the hot subluminous O­star BD+28°4211

M. Ramspeck (1), S. Haas (1), R. Napiwotzki (1), U.Heber (1), J. Deetjen (2), S. Dreizler (2)

(1) Dr. Remeis Sternwarte, Sternwartstr. 7, 96049 Bamberg, Germany
(2) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

To appear in: The 12th European Workshop on White Dwarfs, ASP Conference Series, Vol. xxx, 2001, H.L. Shipman and J.L. Provencal, eds.

Abstract. An analysis of UV spectra of BD+28°4211 obtained with the STIS spectrograph onboard the HST is presented. The spectral analysis is based on NLTE model calculation, which deal with the lineblanketing of iron group elements in great detail. Improved model atoms for iron group elements were set up and new interband cross sections were calculated. Comparison with observation allowed, Mn and Cr lines to be identified for the first time. The abundances of Fe, Ni, Cr and Mn are determined and point to the presence of diffusion processes in the atmosphere of BD+28°4211.

Key words: -

Paper (75k gzip'ed Postscript including figures)

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