FUSE Observations of Cool DB White Dwarfs

Details FUSE Observations of Cool DB White Dwarfs FUSE Observations of Cool DB White Dwarfs

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372..265d&link_type=abstract

15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in

Astronomy and Astrophysics

Astronomy

2

Scientific paper

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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