Assertion: pulsar's companion star | /r/IsA | a neutron star
Facets:
value: immediately
type: MANNER
Source sentences:
text: A compact object in an X-ray binary system consists of either a neutron star or a black hole; however, with the emission of an X-ray burst, the companion star can immediately be classified as a neutron star, since black holes do not have a surface and all of the accreting material disappears past the event horizon.