X- ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are
A) a white dwarf and a main- sequence star.
B) a white dwarf and a neutron star.
C) a contact binary system of two red giants.
D) two neutron stars in a mass transfer binary.
E) a main- sequence or giant star and a neutron star in a mass transfer binary.
Correct Answer:
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