Minara

Minara was the primary star of the Minara system. Minara went supernova in 2268, destroying the planets inhabited by the Vians and by an empathic race refered to as "Gem's people." (TOS episode: "The Empath")

When the USS Enterprise was trapped in an antimatter universe circa 2270, they were able to escape by approaching a dead star which corresponded with the Minara supernova. (TAS episode: "The Counter-Clock Incident")

Radiation emitted by Minara, as well as the Beta Niobe supernova, threatened many nearby systems for years to follow, including Verzhik, which was particularly badly damaged in 2279. (TOS eBook: Mere Anarchy: The Darkness Drops Again)