Variation of disk dissipation and disk luminosity during one binary orbit. The dissipation and luminosity are calculated for five different rings ranging from 0.5–2 AU, 2–3 AU, 3–4 AU, 4–5 AU and 5–8 AU. Because the disk is truncated at about 4.5 AU (see Fig. 3), the outmost ring does not contain much mass. The solid (red) curve is the sum of all five rings. The gray line indicates the binary’s periastron passage.