Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...672..540d&link_type=abstract
The Astrophysical Journal, Volume 672, Issue 1, pp. 540-552.
Astronomy and Astrophysics
Astronomy
13
Ultraviolet: Stars, Stars: White Dwarfs
Scientific paper
We present a comprehensive analysis of the far-ultraviolet spectra of five DB white dwarfs spanning the effective temperature range between 14,700 and 20,800 K. The FUSE line analysis shows that carbon features, previously observed in several hot DB stars at or above 22,000 K, are present in the two coolest (GD 408 and GD 378) and in the hottest (G270-124) target. The observed carbon abundances range from logN(C)/N(He)~-6.9 to ~-8.8. In addition, four of the five objects display photospheric lines of silicon. Other elements such as oxygen, iron, and sulfur are also observed in some objects. The variations of the abundances of heavy elements as a function of effective temperature in DB stars are discussed in terms of a competition between a stellar wind, gravitational settling, accretion from interstellar (and circumstellar) matter, and convective dredge-up.
FUSE is operated by the Johns Hopkins University under NASA contract NAS5-32985.
Chayer Pierre
Desharnais S.
Kruk Jeff W.
Saffer Rex A.
Wesemael François
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