Formation of accretion disks and explosions of type
VV Cephei systems and cataclysmic variables are examples of these systems with an M-type member.  Formation of accretion disks and explosions of type Ia supernova are associated with mass transfer in the semidetached subtype, in which one member fills an equipotential surface known as the Roche lobe.  Examples in which only one component is visible, and that component exhibits oscillatory behavior, are termed astrometric, while examples which exhibit periodic Doppler shifts are termed spectroscopic.  The majority of stars are found in, FTP what sort of system which can be eclipsing, containing two stars?
VV Cephei systems and cataclysmic variables are examples of these systems with an M-type member.  
binary systems or stars (accept semidetached binary before "semidetached subtype" is read)