Mass Accretion Rates of Primaries and Secondaries

The disks are not independent around close binaries -- mass accretion rates of primaries and their secondaries clearly correlate. The secondaries are quite active, and accrete at a rate comparable to that of their primaries (the line shows equal mass accretion rates). When normalized by the mass, the accretion rates of the secondaries are even slightly larger than those of their primaries, on average.