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

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

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..216w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 216-222

Astronomy and Astrophysics

Astronomy

15

Abundance, Atmospheric Stratification, Carbon, Cool Stars, Stellar Atmospheres, Ultraviolet Astronomy, Ultraviolet Spectra, White Dwarf Stars, Atmospheric Composition, Convection, Iue, Surface Layers

Scientific paper

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 log C/He = -7, and Teff = 9,250, 9,000 and 11,000 K. 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.

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