Accretion and diffusion in white dwarfs - New diffusion timescales and applications to GD 362 and G 29-38

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Table 7:

Diffusion data for the variable ZZ Ceti star G 29-38.
el	$\tau$ [yrs]	$\log \epsilon_{\rm atm}$	$\log X_{\rm atm}$	$\log X_{\rm acc}$	$\log X_\odot$
Ca	0.79	0.00	0.00	0.00	0.00
Mg	0.97	1.10	0.88	0.79	1.00
Fe	0.80	0.61	0.82	0.81	1.33

Column 2 gives the time scale in years, Col. 3 the observed number abundances relative to Ca, Col. 4 the observed abundances by mass, also relative to Ca. Column 5 is the predicted abundance in the accreting material, assuming steady state between accretion and diffusion. The final column shows the solar abundances on the same scale. All abundances are in decadal logarithms.

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