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Fig. 8

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Metal pollution in DA white dwarfs as a function of Teff (bottom axis) and cooling age (top axis, for log  g = 8). Star-shaped symbols represent white dwarfs where their dust disks were detected in the infrared. Bottom panel: log (Ca/H) abundances (open circles and stars) and upper limits (gray dots) from Koester & Wilken (2006). Middle panel: the fraction of white dwarfs with photospheric Ca and Si detections. Top panel: inferred total accretion rates, where the Si and Ca abundances have been scaled by bulk Earth abundances (BE) and by solar abundances (S). See text for further explanations.

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