As. Sharov et al., A HIGH-LUMINOSITY ECLIPSING BINARY-SYSTEM WITH A RAPIDLY VARYING PERIOD IN THE GALAXY M-33, Astronomy letters, 23(1), 1997, pp. 37-42
An eclipsing binary system with an orbital period of 33(d).108, whose
Light varies over the range 16(m).8-17(m).8 in B has been detected amo
ng the high-luminosity blue stars in M 33, One of the components appar
ently exhibits intrinsic variability with a small amplitude, The star
lies at the center of a bipolar nebula seen in H alpha. The system is
assumed to contain an accretion disk.