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Fig. 18


Top: photospheric abundances of G191−B2B (red stars) compared with solar values (Asplund et al. 2009). [X] denotes log (mass fraction/solar mass fraction) of element X. The dashed, green line shows the solar ratio. The arrows indicate upper limits. The cyan diamonds (Holberg et al. 2003), triangles (Vennes et al. 1996), and tridents (Vennes et al. 2005) are previously determined values. Bottom: comparison of our abundance number ratios (red stars) with predictions of diffusion calculations for DA-type (blue squares) WDs (Chayer et al. 1995) with and log g = 7.5.

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