Only one confirmed and two proposed binary systems are known in the Be + subdwarf O phase. The problems in identifying such objects are outlined. The observed variability can be modeled physically as the radiative interaction of a hot, compact secondary, ionizing a sector of the disk of the primary.
Only one confirmed and two proposed binary systems are known in the Be + subdwarf O phase. The problems in identifying such objects are outlined. The observed variability can be modeled physically as the radiative interaction of a hot, compact secondary, ionizing a sector of the disk of the primary. (en)