Accretion from debris disks onto white dwarfs - Fingering (thermohaline) instability and derived accretion rates

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Table 2

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

Models	Log Ṁ^a	Log Ṁ^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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