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Title:
FUSE Observations of Cool DB White Dwarfs
Authors:
Desharnais, S.; Wesemael, F.; Chayer, P.; Kruk, J. W.
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.265
Publication Date:
09/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..372..265D

Abstract

We present a preliminary analysis of the far-ultraviolet spectra of four DB white dwarfs spanning the effective temperature range between 16,200 K and 21,500 K. Carbon features, observed in several hot DB stars at or above 22,000 K, are present in the coolest (GD 378) and in the hottest (G 270-124) target. In addition, the FUSE observations show that three of the four objects display photospheric silicon features. The variations of the C and Si abundances as a function of effective temperature in DB stars are interpreted in terms of a competition between a stellar wind, gravitational settling, ISM accretion and convective dredge-up.
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Database: Astronomy
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arXiv e-prints
    


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