FUSE Observations of the Very Cool DB White Dwarf GD408

Details FUSE Observations of the Very Cool DB White Dwarf GD408 FUSE Observations of the Very Cool DB White Dwarf GD408

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910307c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #103.07; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The traces of carbon observed in helium-rich white dwarfs with effective temperatures below 19,000 K are thought to be dredged-up by convection reaching the interface between the helium envelope and the carbon core. The dredge-up model predicts that the carbon contamination of the atmosphere is maximum for stars with an effective temperature around 11,000 K, roughly the temperature at which the surface convection zone is the deepest. The detection of carbon has been most successful for helium-atmosphere stars on the cool side of this maximum, in the so-called DQ stars. At these temperatures, carbon is detected through the neutral carbon lines or the Swan bands, and the abundances determined are in good agreement with the predictions of the dredge-up model. In order to test the model on the hot side of the maximum, amongst the DB stars, we analyze the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of the very cool DB white dwarf GD 408. With an effective temperature of 14,000 K, GD 408 is the coolest DB observed by FUSE. Its ultraviolet spectrum displays the CII doublet at 1036.337 and 1037.018 Angstroms and the Lyman beta line of hydrogen.
P.C. is supported by the Canadian Space Agency and the Herzberg Institute of Astrophysics under a PWGSC contract. This work was also supported in part by the NSERC Canada.

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