from SKYLIGHTS
44 BOO (44 Bootis). Just when you think that star systems can get no odder, along comes something like 44 Bootis, ... Nothing about the star is very secure. At first look, a magnitude 5.2 solar type class G2 dwarf (but given as warm as F7) is in mutual orbit with a magnitude 6.10 K2 (G? K4?) dwarf with a period of 209.8 years ...
With a temperature of 5670 Kelvin, 44 Boo A shines with the total light of just 1.13 times that of the Sun, which leads to a radius of 1.1 solar radii, all consistent with a solar mass star of a bit more age than our own. 44 Boo B should then have a mass roughly equal to that of 44 A. But here comes the surprise, as 44 B is not only itself double, but is an eclipsing binary with an orbital period of a mere 6.43 hours, the little system varying continuously between magnitudes 5.8 and 6.4. The two stars, seemingly each lesser than the Sun, must be so close as to be in contact with each other, or at least nearly so, the little system shaped something like a peanut, which explains the continuous variation as the two whirl around presenting different faces to us. Mass is probably being transferred from one star to the other, indeed one star may be consuming the other. ...
Read on at
http://stars.astro.illinois.edu/sow/44boo.html