A pulsar is a rotating neutron star which emits detectable electromagnetic radiation, including radio waves. The radiation intensity varies with a regular period, corresponding to the star's rotation period.
A rogue pulsar designated PSR 418-D/1015.3 passed through the Mestiko system in 2265, doing significant damage to the planet Mestiko, despite the best efforts of the Federation and the crew of the USS Enterprise. (TOS eBook: Things Fall Apart)
In 2332, the USS Enterprise-C detected a binary star system which was made up of a pulsar and subgiant star. Because the pulsar had the strongest gravity it stole layers of gas from the subgiant. (ST short story: "Hour of Fire")
|By class and type||class O blue-violet star • class B blue star • class A blue-white star • class F white star (white dwarf) • class G yellow star (yellow dwarf • yellow giant) • class K orange star (orange giant) • class M red star (red dwarf • red giant) • green star • brown dwarf • N-type star • R-type star • S-type star • D-type star|
|By size or makeup||black hole/black star • carbon star • collapsar • dwarf star (brown dwarf • red dwarf • white dwarf • yellow dwarf) • giant star (blue giant • red giant • orange giant • yellow giant) • Lazarus star • neutron star • protostar • pulsar • supergiant star • Wolf-Rayet star|