Astrometric ones contain a very dim or invisible object.
VW Cephei contains what is probably the largest red giant yet discovered, and is the contact variety of this entity. Astrometric ones contain a very dim or invisible object. Objects in this type of system have regions of gravitational influence known as Roche lobes. One variety of these systems, exemplified by Algol, has two dips in luminosity as the rotating objects come between the viewer and a star; that is the eclipsing type of these systems. For 10 points, name these systems that consist of two stars.
VW Cephei contains what is probably the largest red giant yet discovered, and is the contact variety of this entity.
{binary} systems [or {binary} stars]