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Title:
Abundances of Light Elements in Hot White Dwarf Atmospheres
Authors:
Dupuis, J.; Chayer, P.; Vennes, S.; Kruk, J. W.; Hénaul-Brunet, V.
Publication:
15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in Leicester, United Kingdom. Edited by Ralf Napiwotzki and Matthew R. Burleigh. San Francisco: Astronomical Society of the Pacific, 2007., p.205
Publication Date:
09/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..372..205D

Abstract

We use the Far Ultraviolet Spectroscopic Explorer (FUSE) to observe a comprehensive sample of hot DA white dwarfs in order to uncover abundance patterns that could help us to constrain the diffusion theory. FUSE covers a spectral range that contains several strong lines from key atomic and ionic species. Using NLTE stellar atmosphere models, we analyze 59 DA white dwarfs over a wide range of stellar parameters. The effective temperatures range from 16,000 K to 70,000 K and the surface gravities range from log g = 7.0 to 9.0. We present an abundance analysis for the light elements C, Si, P, and S for which we measure abundances or set stringent upper limits in case of non-detection.
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