Fig. 12.
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Effective temperature vs. log [Ca/He] for DB WDs. Panels (a), (b), and (c) represent models with different mass DB WDs and a constant accretion rate (106, 108 and 1010 g s−1), respectively. Panels (d) is for the mass-accretion rate given by Eq. (5). Black, red and green dots represent observations from Koester & Kepler (2015), Dufour et al. (2007) and Hollands et al. (2017), respectively.
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