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Table 2

Accretion rates (g s-1) and observed heavy element abundances by number of hydrogen (or helium).

Models Log a Log b Log[Ca/H(e)] Log[Z/H(e)]

1 (DAZ) 9.23 9.83 –7.2 –5.4
2 (DAZ) 7.74 10.01 –7.1 –5.3
3 (DAZ) 7.70 9.40 –7.7 –5.9
4 (DBZ) 8.04 8.04 –12.4 –10.6
5 (DBZ) 10.08 10.08 –7.5 –5.7
6 (DBZ) 10.70 10.80 –8.0 –6.2

Notes.

(a)

Accretion rates computed with the assumption of pure gravitational settling;

(b)

Accretion rates computed with fingering convection included.

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