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Preprint 10b/00

Iron-group line blanketing in the Far-UV range of the sdO Feige 67

Jochen L. Deetjen (1)

(1) 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. We demonstrate the importance of correctly considerating iron-group line blanketing for the analysis of high-resolution Far-UV spectra (e.g. from FUSE) of hot compact stars. An analysis of the subdwarf O star Feige 67 is presented, which is well suited to illustrate the diffculties and possible error sources related to the Fe and Ni line blanketing effect, because it is known for its overabundance of the elements (probably due to radiative levitation) and because high-resolution spectra are available and the stellar parameters are well known (Haas 1997).
By means of three examples we will show the problems for an accurate determination of iron and nickel abundances: The consideration of a broad wavelength range for a reliable determination of the stellar continuum the role of interstellar reddening and the normalization of the model to the observation.

Key words: -

Paper (882k gzip'ed Postscript including figures)

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