SIMBAD references

1995A&A...297..216W - Astronomy and Astrophysics, volume 297, 216-222 (1995/5-1)

Surface carbon abundances and compositional stratification of cool helium-rich white dwarfs.

WEIDEMANN V. and KOESTER D.

Abstract (from CDS):

From the ultraviolet lines of CI in IUE spectra of the DQ white dwarfs L 845-70, GD 84, and G 188-27 we determine a surface carbon abundance of logC/He=-7, and Teff=9250, 9000 and 11000K. Comparison with the results for other stars of the same spectral class indicates variations in carbon abundance at the same temperature. If the carbon is the result of surface pollution by interior carbon dredged up by convection, we conclude that the variations cannot be caused by mass differences but probably by different outer helium layer thicknesses.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - abundances - stars: white dwarfs - stars: individual: L 845-70 , GD 84, G 188-27

Simbad objects: 29

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