text: Van Maanen's star was the first star of this type not found in a binary or triple system.
full_question: Van Maanen's star was the first star of this type not found in a binary or triple system. ZZ Ceti and GW Virstars are stars of this type that have variable luminosities, making them their "pulsating" type. In a cataclysmicvariable system, an accretion disk forms around a star of this type as it siphons matter from its companion.The progenitor of type Ia (one a) supernova is accretion onto a star of this type. Stars of this type are foundnear the bottom left corner of the Hertzsprung-Russell diagram. The upper mass limit of these stars is givenby the Chandrasekhar limit. These stars are formed by stars, such as the Sun, that are not massive enough tobecome neutron stars. For 10 points, name this type of dwarf star. 
first_sentence: Van Maanen's star was the first star of this type not found in a binary or triple system.
raw_answer: white dwarf [or word forms; or white dwarf after "dwarf star" is read; prompt on dwarf stars until "dwarf star" is read] 